TYPE_OF_FILE_NAME: PWI MISSION ANALYSIS FILE FILE_ATTRIBUTES: FIX LENGTH UNFORMATTED SEQUENTIAL RECORD_TYPE_NAMES: DATA RECORD PWI_DATA_RECORD_FORMAT_DESCRIPTION: PWI_DATA_RECORD_LENGTH: 1768 BYTES PWI_DATA_TYPE: BINARY FILE_STRUCTURE: UNFORMATTED SEQUENTIAL RECORDS OF FIXED LENGTH FORMAT_OVERVIEW: (1) Words are 32 bits long (4 bytes). (2) Records contain 8 seconds of data; 1 major frame. (3) All data are stored as integer values. (4) All science data values, as opposed to time, ephemeris, attitude, or header values, are packed four values per word. (5) The header word for the first record of a PWI file contains the hexidecimal value 00006363. The header words for all subsequent records of a PWI file contain the hexidecimal value 00000063. (6) A nadir time indicates when, during the 6 second spacecraft rotation period, the spacecraft +Y axis was pointing at the center of the earth. Records should contain one or two nadir times. Extra nadir values are set to -1. RECORD_OVERVIEW: ALL WORDS ARE IBM FORMAT (4 byte integers) Word# Function Notes 1 Header indicates the start of an 8-sec record 2 Date year and day of year in the form (YYDDD) where January 1 = 001 3 Time milliseconds of day 4 - 13 Instrument Status (See Section A) 14- 47 Orbit Data (See Section B) 48- 49 Nadir Times 50- 52 Spares 53-180 DC Electric Field Values DC field values in the spin plane and along the spin axis (See Section C) 181-244 Step Frequency Receiver (SFR-A AC field values (100 and SFR-B) Amplitude Values Hz to 410 kHz) (See Section D) 245-308 Step Frequency Correlator Wave vector components: Sine and Cosine Functions polarization and wave direction (In-phase and quadrature phase) (100 Hz to 410 kHz) 309-372 Low Frequency Receiver (LFC-A AC field values (1.78 and LFC-B) Amplitude Values Hz to 100 Hz) (See Section E) 373-436 Low Frequency Correlator Wave vector components: Sine and Cosine Functions polarization and wave direction (In-phase and quadrature phase) (1.78 Hz to 100 Hz) 437-442 Spares DETAILED_RECORD_FORMAT: A. INSTRUMENT_STATUS_VALUES: Notes: (1) All PWI instrument status values (words 4-13) contain 8 bits of information in the least significant byte. Word 9 which contains 4 packed bytes is one exception. (2) Some of the status values pertain to spacecraft housekeeping and instrument health and are not discussed here. Status values which pertain to the status of the wideband instrument are not discussed here, because the wideband data (both WBR and LWR) will not be archived. Instrument status words used in the processing of PWI data are discussed below. (3) Bit #1 of a byte is the most significant bit. LFC LO Band Channel Indicator Value ______________ Isolate bits 1 - 2 of the least significant byte of word 4. The values 0 - 3 of this 2-bit combination correspond to the following LFC LO Band channels and frequencies: 0 -- 1.78 Hz 1 -- 3.12 Hz 2 -- 5.62 Hz 3 -- 10 Hz SFC Skip Frequency Mode _______________ Isolate bit 1 of the least significant byte of word 5. The values 0 and 1 of this bit correspond to the following selections: 0 -- Skip 1 (usual operating mode). The SFR will sequentially advance through its 32 steps at one second intervals in the sweep mode. 1 -- Skip 8 (optional mode). This mode sequentially selects every eighth step and remains in this step for 8 seconds. LFC-B Antenna Indicator Value _______________ Isolate bits 1-2 of the least significant byte of word 6. The values 0-3 of this 2-bit combination correspond to the following LFC-B Antenna selections: 0 -- Es 1 -- EZ 2 -- EX 3 -- H LFC-A Antenna Indicator Value _______________ Isolate bits 3-4 of the least significant byte of word 6. The values 0-3 of this 2-bit combination correspond to the following LFC-A Antenna selections: 0 -- EZ 1 -- EX 2 -- H 3 -- Es SFR-B Antenna Indicator Value _______________ Isolate bits 5-6 of the least significant byte of word 6. The values 0-3 of this 2-bit combination correspond to the following SFR-B antenna selections: 0 -- Es 1 -- EZ 2 -- EX 3 -- B SFR-A Antenna Indicator Value ______________ Isolate bits 7 - 8 of the least significant byte of word 6. The values 0 - 3 of this 2-bit combination correspond to the following SFR-A Antenna selections: 0 -- EZ 1 -- EX 2 -- B 3 -- Es SFC Gain Select _______________ Isolate bits 1-2 of the least significant byte of word 7. The values 0-3 of this 2-bit combination correspond to the following gain selections, which apply only to the top three channels of the SFC: 0 -- Low gain (30 dB attenuation) 1 -- High gain (no attenuation) 2 -- Low gain (30 dB attenuation) 3 -- Toggle (switch from low to high gain every 0.5 seconds) Calibration Signal Switch (via pulse command) _______________ Isolate bit 3 of the least significant byte of word 7. The values 0 and 1 of this bit correspond to the following calibration selections: 0 -- Inhibit calibration signal 1 -- Turn calibration signal on Calibration Signal Switch (via serial command) _______________ Isolate bit 4 of the least significant byte of word 7. The values 0 and 1 of this bit correspond to the following selections: 0 -- Disable calibration signal 1 -- Enable calibration signal The calibration signal is on only if enabled by both the serial and pulse commands. The signal can be disabled by either command. SFC Antenna Manual/Automatic _______________ Isolate bit 3 of the least significant byte of word 8. The values 0 and 1 of this bit correspond to the following operating modes: 0 -- Antennas are manually selected 1 -- Antennas are automatically selected LFC Antenna Manual/Automatic _______________ Isolate bit 4 of the least significant byte of word 8. The values 0 and 1 of this bit correspond to the following operating modes: 0 -- Antennas are manually selected 1 -- Antennas are automatically selected LFC Low Band Lock/Sweep Indicator Value _______________ Isolate bit 6 of the least significant byte of word 8. The values 0 and 1 of this bit correspond to the following operating modes for the low band channel of the LFC: 0 -- Sweep mode (normal operating mode). The LFC will sequentially advance through four frequency bands in the low band channel, remaining on each band for 8 seconds. 1 -- Lock mode (optional mode). A single frequency is selected. LFC High Band Lock/Sweep Indicator Value _______________ Isolate bit 7 of the least significant byte of word 8. The values 0 and 1 of this bit correspond to the following operating modes for the high band channel of the LFC: 0 -- Sweep mode (usual operating mode). The LFC will sequentially advance through four frequency bands in the high band channel, remaining on each band for 1 second. 1 -- Lock mode (optional mode). A single frequency is selected. SFC Lock/Sweep Indicator Value _______________ Isolate bit 8 of the least significant byte of word 8. The values 0 and 1 of this bit correspond to the following operating modes for the SFC: 0 -- Sweep mode (normal operating mode). The SFR will sequentially advance through the 32 steps of each of its four frequency channels at one second intervals in the sweep mode. The dwell time at a particular frequency is one second and, during this time, the output of each channel is sampled four times. An entire spectrum is available in 32 seconds. 1 -- Lock mode (optional mode). Any one of the 32 frequency steps of a given SFR channel can be selected in the lock mode. SFC x4 Sweep Rate Indicator _______________ Isolate bit 1 of the most significant byte of word 9. The values 0 and 1 of this bit correspond to the following operating modes for the SFC at the time encoded in words 2-3 (see above) (T=0): 0 -- x1 (default sweep rate). The entire spectrum (100 Hz to 410 kHz) is available in 32 seconds. Amplitude and phase information from each of the four frequency channels is sampled at 4 times/second. The dwell time at each of the 32 frequency steps of a channel is one second and, during this time, the output of each channel is sampled four times. 1 -- x4 (optional sweep rate). The entire spectrum is available in 8 seconds. Amplitude and phase information from each of the four frequency channels is sampled 4 times/second. The dwell time at each of the 32 frequency steps of a channel is 0.25 seconds and, during this time, the output of each channel is sampled once. LFC HI Band Channel Indicator Value _______________ Isolate bits 2 - 3 of the most significant byte of word 9. The values 0 - 3 of this 2-bit combination correspond to the following LFC HI Band channels and frequencies at the time encoded in words 2-3 (T = 0): 0 -- 17.8 Hz 1 -- 31.2 Hz 2 -- 56.2 Hz 3 -- 100 Hz Similar information on the LFC high band channels and frequencies can be found in the remaining three bytes of word 9. The LFC channel information is provided for t = T + 2 seconds (bits 2-3 of the second byte), for t = T + 4 seconds (bits 2-3 of the third byte) and for t = T + 6 seconds (bits 2-3 of the least significant byte). SFR Step Indicator Value _______________ Isolate bits 4 - 8 of the most significant byte of word 9. The numeric value of these five bits ranges 0 - 31 which corresponds to steps 0 - 31 of the SFR's (see table of SFR frequencies below). SFR frequencies (units of Hz) STEPS CHANNEL 0 CHANNEL 1 CHANNEL 2 CHANNEL 3 0 0.10478687E+03 0.11782949E+04 0.72563594E+04 0.57960875E+05 1 0.11344312E+03 0.12475449E+04 0.78103594E+04 0.62392875E+05 2 0.12217090E+03 0.13173672E+04 0.83689375E+04 0.66861500E+05 3 0.13097168E+03 0.13877734E+04 0.89321875E+04 0.71367500E+05 4 0.13984619E+03 0.14587695E+04 0.95001563E+04 0.75911250E+05 5 0.14879492E+03 0.15303594E+04 0.10072875E+05 0.80493000E+05 6 0.15781934E+03 0.16025547E+04 0.10650438E+05 0.85113500E+05 7 0.16692041E+03 0.16753633E+04 0.11232906E+05 0.89773250E+05 8 0.17609888E+03 0.17487910E+04 0.11820328E+05 0.94472625E+05 9 0.18535571E+03 0.18228457E+04 0.12412766E+05 0.99212125E+05 10 0.20410864E+03 0.19728691E+04 0.13612953E+05 0.10881363E+06 11 0.21360693E+03 0.20488555E+04 0.14220844E+05 0.11367675E+06 12 0.23285229E+03 0.22028184E+04 0.15452547E+05 0.12353038E+06 13 0.25243701E+03 0.23594961E+04 0.16705969E+05 0.13355775E+06 14 0.26235938E+03 0.24388750E+04 0.17341000E+05 0.13863800E+06 15 0.28246973E+03 0.25997578E+04 0.18628063E+05 0.14893450E+06 16 0.29266016E+03 0.26812813E+04 0.19280250E+05 0.15415200E+06 17 0.31331763E+03 0.28465410E+04 0.20602328E+05 0.16472863E+06 18 0.33435254E+03 0.30148203E+04 0.21948563E+05 0.17549850E+06 19 0.35577515E+03 0.31862012E+04 0.23319609E+05 0.18646688E+06 20 0.37759619E+03 0.33607695E+04 0.24716156E+05 0.19763925E+06 21 0.39982715E+03 0.35386172E+04 0.26138938E+05 0.20902150E+06 22 0.43396753E+03 0.38117402E+04 0.28323922E+05 0.22650138E+06 23 0.45727515E+03 0.39982012E+04 0.29815609E+05 0.23843488E+06 24 0.49308887E+03 0.42847109E+04 0.32107688E+05 0.25677150E+06 25 0.51755273E+03 0.44804219E+04 0.33673375E+05 0.26929700E+06 26 0.55516602E+03 0.47813281E+04 0.36080625E+05 0.28855500E+06 27 0.59392480E+03 0.50913984E+04 0.38561188E+05 0.30839950E+06 28 0.63388257E+03 0.54110605E+04 0.41118484E+05 0.32885788E+06 29 0.68912207E+03 0.58529766E+04 0.44653813E+05 0.35714050E+06 30 0.73210278E+03 0.61968223E+04 0.47404578E+05 0.37914663E+06 31 0.79160229E+03 0.66728184E+04 0.51212547E+05 0.40961038E+06 Similar information on the SFR step indicator values can be found in the remaining three bytes of word 9. The step indicator information is provided for t = T + 2 seconds (bits 4-8 of the second byte), for t = T + 4 seconds (bits 4-8 of the third byte) and for t = T + 6 seconds (bits 4-8 of the least significant byte). Wideband Receiver Transmitter Flag _______________ Isolate bit 6 of the least significant byte of word 10. The values 0 and 1 of this bit correspond to the following status in the transmission of wideband data: 0 -- No wideband data is available 1 -- Wideband data is available No wideband data will be archived. The user must contact the principal investigator to acquire this data. B. ORBIT_DATA: Note: All orbit data values in a record have been multiplied by 10000 to preserve precision and then converted to IBM four byte integer format. Word # Function 1) 14 GEI Satellite Velocity Vector (v(x)) km/sec 2) 15 GEI Satellite Velocity Vector (v(y)) km/sec 3) 16 GEI Satellite Velocity Vector (v(z)) km/sec 4) 17 Altitude Above Spheroid Earth Kilometers 5) 18 Geodetic Latitude of Subsatellite Point Degrees 6) 19 East Longitude of Satellite Degrees 7) 20 Local Magnetic Time Hours 8) 21 McIlwain's Shell Parameter (L) Earth radii 9) 22 Invariant Latitude Degrees 10) 23 Magnetic Field Strength Gauss 11) 24 GEI Magnetic Field Vector (B(x)) Gauss 12) 25 GEI Magnetic Field Vector (B(y)) Gauss 13) 26 GEI Magnetic Field Vector (B(z)) Gauss 14) 27 Orbit Number 15) 28 3-by-3 Rotation Matrix for Transformation 16) 29 From Spacecraft Coordinates 17) 30 --- 18) 31 --- 19) 32 --- 20) 33 --- 21) 34 --- 22) 35 --- 23) 36 --- 24) 37 GEI Satellite Position Vector (r(x)) Kilometers 25) 38 GEI Satellite Position Vector (r(y)) Kilometers 26) 39 GEI Satellite Position Vector (r(z)) Kilometers 27) 40 GEI Satellite Velocity Relative to (R(x)) km/sec 28) 41 Rotating Atmosphere (R(y)) km/sec 29) 42 (R(z)) km/sec 30) 43 GEI Vector Toward Sun (x) Unit Vector 31) 44 GEI Vector Toward Sun (y) Unit Vector 32) 45 GEI Vector Toward Sun (z) Unit Vector 33) 46 Phase Angle of Spin Measured From Radians Velocity Vector to x-axis of spacecraft 34) 47 Sunlight/Darkness Flag = 0, Darkness = 1, Sunlight 35) 48-49 Nadir times Milliseconds of day C. DC_ELECTRIC_FIELD_DATA_FORMAT: ALL WORDS ARE IBM FORMAT (4 byte integers) Words # 50-52 Spares 53-180 DC ELEC FIELD (1 sec/16 values) The two most significant bytes of each word contain two simultaneous measurements of the DC electric field using the Ex antenna. The remaining bytes contain two simultaneous measurements of the DC electric field using the Ez antenna. Each word represents 1/16 second of data. D. STEP_FREQUENCY_RECEIVER_DATA_FORMAT: (SFR) ALL WORDS ARE IBM FORMAT (4 byte integers) n = SFR Step # computed from status (0, 8, 16, or 24). The SFR step is set to 0 (synchronized with the major frame pulse) when the instrument receives the 96-second spacecraft sync pulse. Maximum delay is 96 seconds after the instrument has been turned on. Words # 181-188 SFR-A CHAN 3 Steps n to n + 7 (1 sec/4 values) 189-196 SFR-A CHAN 2 Steps n to n + 7 (1 sec/4 values) 197-204 SFR-A CHAN 1 Steps n to n + 7 (1 sec/4 values) 205-212 SFR-A CHAN 0 Steps n to n + 7 (1 sec/4 values) 213-220 SFR-B CHAN 3 Steps n to n + 7 (1 sec/4 values) 221-228 SFR-B CHAN 2 Steps n to n + 7 (1 sec/4 values) 229-236 SFR-B CHAN 1 Steps n to n + 7 (1 sec/4 values) 237-244 SFR-B CHAN 0 Steps n to n + 7 (1 sec/4 values) SFC SINE AND COSINE FUNCTIONS 245-252 SFC SIN CHAN 3 Steps n to n + 7 (1 sec/4 values) 253-260 SFC SIN CHAN 2 Steps n to n + 7 (1 sec/4 values) 261-268 SFC SIN CHAN 1 Steps n to n + 7 (1 sec/4 values) 269-276 SFC SIN CHAN 0 Steps n to n + 7 (1 sec/4 values) 277-284 SFC COS CHAN 3 Steps n to n + 7 (1 sec/4 values) 285-292 SFC COS CHAN 2 Steps n to n + 7 (1 sec/4 values) 293-300 SFC COS CHAN 1 Steps n to n + 7 (1 sec/4 values) 301-308 SFC COS CHAN 0 Steps n to n + 7 (1 sec/4 values) E. LOW_FREQUENCY_CORRELATOR_DATA_FORMAT: (LFC) ALL WORDS ARE IBM FORMAT (4 byte integers) Words # 309-310 LFC-A HI BAND 0 (1 sec/8 values) 311-312 LFC-A HI BAND 1 (1 sec/8 values) 313-314 LFC-A HI BAND 2 (1 sec/8 values) 315-316 LFC-A HI BAND 3 (1 sec/8 values) 317-318 LFC-A HI BAND 0 (1 sec/8 values) 319-320 LFC-A HI BAND 1 (1 sec/8 values) 321-322 LFC-A HI BAND 2 (1 sec/8 values) 323-324 LFC-A HI BAND 3 (1 sec/8 values) Words # 341-342 LFC-B HI BAND 0 (1 sec/8 values) 343-344 LFC-B HI BAND 1 (1 sec/8 values) 345-346 LFC-B HI BAND 2 (1 sec/8 values) 347-348 LFC-B HI BAND 3 (1 sec/8 values) 349-350 LFC-B HI BAND 0 (1 sec/8 values) 351-352 LFC-B HI BAND 1 (1 sec/8 values) 353-354 LFC-B HI BAND 2 (1 sec/8 values) 355-356 LFC-B HI BAND 3 (1 sec/8 values) m = LFC LO band computed from status (0, 1, 2, or 3) (the PWI dwells on a single LFC LO band for 8 seconds) Words# 325-340 LFC-A LO BAND m (8 sec/64 values) 357-372 LFC-B LO BAND m (8 sec/64 values) LFC SINE AND COSINE FUNCTIONS 373-374 LFC SIN HI BAND 0 (1 sec/8 values) 375-376 LFC SIN HI BAND 1 (1 sec/8 values) 377-378 LFC SIN HI BAND 2 (1 sec/8 values) 379-380 LFC SIN HI BAND 3 (1 sec/8 values) 381-382 LFC SIN HI BAND 0 (1 sec/8 values) 383-384 LFC SIN HI BAND 1 (1 sec/8 values) 385-386 LFC SIN HI BAND 2 (1 sec/8 values) 387-388 LFC SIN HI BAND 3 (1 sec/8 values) 389-404 LFC SIN LO BAND m (8 sec/64 values) 405-406 LFC COS HI BAND 0 (1 sec/8 values) 407-408 LFC COS HI BAND 1 (1 sec/8 values) 409-410 LFC COS HI BAND 2 (1 sec/8 values) 411-412 LFC COS HI BAND 3 (1 sec/8 values) 413-414 LFC COS HI BAND 0 (1 sec/8 values) 415-416 LFC COS HI BAND 1 (1 sec/8 values) 417-418 LFC COS HI BAND 2 (1 sec/8 values) 419-420 LFC COS HI BAND 3 (1 sec/8 values) 421-436 LFC COS LO BAND m (8 sec/64 values) DESCRIPTION_OF_SOFTWARE: The software to be archived will convert raw telemetry data values to data values in meaningful geophysical units. The software will request start and stop times (YYDDD HHMMSS YYDDD HHMMSS), the type of data desired (LFC AMPLITUDES, SFR AMPLITUDES, DC ELECTRIC FIELDS, LFC PHASE or SFR PHASE) and the full name of the output file to be written. The output of the processing software will be an ASCII file containing the calibrated electric or magnetic field data or phase in the form of a table containing the time of the measurement, the frequency of the measurement, the data value(s) expressed in physical units, the antenna(s) used during the measurement, the geocentric radial distance of the spacecraft, the L-shell value, the magnetic local time and the magnetic latitude. CALIBRATION_DATA_FILES: Since the PWI primary data files contain only raw telemetry values consisting of data counts covering 0-255 levels, it is in all cases necessary to convert these raw values to meaningful geophysical values using existing calibration data. Depending on the type of PWI data being processed by the user, one or more of the following calibration data files will be needed. FILE FUNCTION FILE NAME - SFR amplitude calibration tables SFR_AMP.CAL - LFC amplitude calibration tables LFC_AMP.CAL - electric sensor effective electrical lengths (see below) - magnetic sensor amplitude response MAG_AMP.CAL - table of SFR effective bandwidths SFR_BWD.CAL - table of LFC effective bandwidths LFC_BWD.CAL PROCESSING_EXAMPLE: The example given below illustrates the use of both primary and calibration data, and illustrates the simple algorithm used by the archived software to calibrate the plasma wave data. All operations contained in the algorithm will be accomplished using archived software. The algorithm processes all consecutive PWI data records in the requested time interval. The data are extracted, calibrated, and stored in an array to be written to an output file. In general, processing proceeds as follows: . Create input buffer (442 32-bit integer array) . Create output arrays to contain calibrated data values for the requested time interval (START) . Read a record into 442 word array . Deduce instrument status from PWI status words . Do the following: -unpack values in one data word -use the value to index into the calibration look-up table -convert the value to meaningful geophysical units using the appropriate calibration tables, bandwidths and antenna lengths (see description given below) -store the value in the appropriate position of the appropriate output array . Repeat (START until all records in the requested interval have been processed) . The user will be responsible for the software to display the contents of output array. . The output array is written to the designated output file. The output file will be organized in columns containing the time, frequency, data value, units of the data value, the antenna selected, geocentric radial distance of the spacecraft, L-shell, magnetic local time and magnetic latitude. Values in the SFR and LFC amplitude calibration tables are in units of volts. If an electric sensor is selected, electric field values are derived by dividing the calibrated value by the appropriate effective electrical length for the given sensor. Data values are then in volts/meter. The effective electrical lengths which are to be used are given below. antenna effective AC electrical length _______ ___________________________ Ex 101.4 Ez 5.0 Es 0.6 If the SFR and LFC are connected to magnetic sensors, then the value derived from the amplitude calibration table must be multiplied by the value for the appropriate frequency from the volts-to-gammas conversion table (MAG_AMP.CAL). Data values are then in gammas. SFR and LFC electric and magnetic amplitude values will be returned in units of spectral density ((V**2/m**2)/Hz and gammas**2/Hz). In order to derive the spectral density values, the calibrated field strength will be squared and divided by the effective bandwidth. The effective bandwidths for each SFR channel and the effective bandwidths for each band of the two LFC channels are included in two tables of effective bandwidths (see description in Section #D and E below). There are 4 bandwidth entries in the table of SFR bandwidths, one for each of the 4 frequency channels of the SFR. There are 8 bandwidth entries in the table of LFC bandwidths, one for each of the 8 frequency bands of the LFC. Users who wish to work with electric and magnetic field strengths must reverse this process by multiplying the spectral density by the appropriate bandwidth and taking the square root. CALIBRATION_TABLE_FORMATS: A. SFR AMPLITUDE (SFR_AMP.CAL) There are 4 calibration tables for the SFR's. These tables are in consecutive order in the file "SFR_AMP.CAL". The 4 tables correspond to the 4 frequency channels ( 0 through 3) for both SFR-A and SFR-B. The tables are in ASCII and the numbers are in the fortran format 1PE10.3. There are 8 entries per line and 32 lines per table, for a total of 256 calibration values. These 256 values correspond to the 256 possible raw telemetry values in the appropriate 8-bit telemetry word, and are organized from lowest to highest amplitude. The conversion from raw counts to volts is accomplished by using the telemetry value, in counts, to index into the appropriate SFR calibration table. If, for example, the content of the science telemetry word for SFR-A channel 3 is 127 counts, the 127th entry in the 4th calibration table is the corresponding amplitude value, in volts. B. LFC AMPLITUDE (LFC_AMP.CAL) There are 8 calibration tables for the LFC. These tables are in consecutive order in the file "LFC_AMP.CAL". The 8 tables correspond to the 8 frequency bands (high band channel, 0 through 3, and low band channel, 0 through 3) for both LFC-A and LFC-B, as shown below. CAL TABLE LFC CHANNEL LFC BAND 1 Lo 0 2 Lo 1 3 Lo 2 4 Lo 3 5 Hi 0 6 Hi 1 7 Hi 2 8 Hi 3 The tables are in ASCII and the numbers are in the fortran format 1PE10.3. There are 8 entries per line and 32 lines per table, for a total of 256 calibration values. These 256 values correspond to the 256 possible raw telemetry values in the appropriate 8-bit telemetry word, and are organized from lowest to highest amplitude. The conversion from raw counts to volts is accomplished by using the telemetry value, in counts, to index into the appropriate LFC calibration table. If, for example, the content of the science telemetry word for LFC-A HI band 3 is 127 counts, the 127th entry in the 8th calibration table is the corresponding amplitude value in volts. C. MAGNETIC ANTENNA AMPLITUDE (MAG_AMP.CAL) The values in MAG_AMP.CAL provide the means for converting from calibrated amplitude values (volts) to units of magnetic field strength (gammas). The table includes calibration values for both the search coil (H), which measures up to 100 Hz, and the loop antenna (B), which covers the frequency range above 100 Hz. The table is in ASCII and the numbers are in the fortran format E10.3. The table contains 136 values in all, eight values for the eight LFC bands, and four sets of 32 values for the four SFR channels. The values correspond to 136 unique frequencies, and are organized in order of increasing frequency. D. TABLE OF SFR BANDWIDTHS (SFR_BWD.CAL) There is one table which provides the effective bandwidths for each of the 4 frequency channels of the SFR. The table is in ASCII and the numbers are in the fortran format E10.3. There are 3 entries per line and 4 lines per table, corresponding to the 4 frequency channels of the SFR. Each frequency channel has a characteristic bandwidth. The first entry of each line will contain the minimum frequency (in Hz) for one frequency channel and the second entry of each line will contain the maximum frequency (in Hz) for that frequency channel. The third entry of each line will contain the effective bandwidth (in Hz) for that frequency channel. The effective bandwidths are organized in order of increasing frequency. The conversion from electric or magnetic field strength to spectral density is accomplished by squaring the field strength (in V/m or gammas) and dividing by the appropriate bandwidth. E. TABLE OF LFC BANDWIDTHS (LFC_BWD.CAL) There is one table which provides the effective bandwidths for each of the 8 frequency bands of the two LFC channels. The table is in ASCII and the numbers are in the fortran format E10.3. There are 2 entries per line and 8 lines per table, corresponding to the 8 frequency bands of the LFC HI and LO band channels. Each frequency band has a characteristic bandwidth. The first entry of each line will contain the frequency (in Hz) for one frequency band of the LFC. The second entry of each line will contain the effective bandwidth (in Hz) for that frequency band. The effective bandwidths are organized in order of increasing frequency. The conversion from electric or magnetic field strength to spectral density is accomplished by squaring the field strength (in V/m or gammas) and dividing by the appropriate bandwidth.