AAREADME - ISIS 1/CEP - DKB - August 10, 2000 ------------------------------------------------------------------ NSSDC-ID: 69-009A-07A Size: 12,510,816 Bytes Time Period: 1969-Jan-30 to 1971-June-1 Time Resolution:1-5 minutes Format: ASCII This data set includes the archived data from the Cylindrical Electrostatic Probe (CEP) experiment on the ISIS-1 satellite. ISIS-1 was launched on 1969-01-30 into an elliptical orbit (500-3500km) with an inclination of 88.4 degrees. It's payload included sweep- and fixed-frequequency ionosondes, a VLF receiver, energetic and soft particle detectors, an ion mass spectrometer, an electrostatic analyzer, a beacon transmitter, a cosmic noise experiment and the CEP. A tape recorder with 1-h capacity was included on the satellite. Data were also collected during overflights of several telemetry stations. The telemetry stations were in areas that provided primary data coverage near the 80-deg-W meridian and in areas near Hawaii, Singapore, Australia, the UK, Norway, India, Japan, Antarctica, New Zealand, and Central Africa. The data set provides alternatively electron density and temperature as deduced from the CEP ampere-voltage curves. The time resolution is typically 30 seconds from density to temperature measurement and 3.5 minutes from temperature to density measurement. The format description of the ASCII data set is as follows (there is an additional blank space, 1X, between consecutive parameters for reading convenience): identification format units Description ---------------------------------------------------------------------- year i4 month i3 day i3 hour i3 minute i3 second i3 local time f5.1 decimal hours geodetic latitude i4 degrees geodetic longitude i4 degrees geomagnetic latitude i4 degrees geomagnetic longitude i4 degrees altitude i5 km magnetic inclination (dip) i4 degrees [from tape] magnetic inclination (dip) f6.1 degrees [newly computed using IGRF model] magnetic field strength B i3 1/100 Gauss L value f6.2 [newly computed using IGRF model] quality code for L value i2 [1 : L is correct, 2 : L is incorrect, 3 : L is an approximation) solar zenith angle i4 degrees ap index (daily) i4 [newly added parameter] kp index (3 hour) i3 *10 [o = .0, + = .3, - = -.3 examp.: 3- = 27, 3+ = 33,3o=30] [newly added parameter] F10.7 (solar radio flux, daily) i4 [newly added parameter] sunspot number (daily) i4 [newly added parameter] orbit number i6 electron temperature i5 K electron density e8.1 cm-3 satellite potential i5 mV station code a4 see list at http://nssdc/space/isis/isis-table1-new.html -------------------------------------------------------------------------------- Fill values: Using '9' for all digits, e.g., electron temperature, satellite potential (format i5) - 9999, L-value - 99.99, exception (e format): electron density - 1.0e+35. Note that an FTPHelper interface to this dataset, providing data subsetting and and graphical browsing, is available at http://omniweb.gsfc.nasa.gov/ftpbrowser/ftphelper.html ------------------------------------------------------- Data contact: Dieter.Bilitza-1@nasa.gov> NASA Official: Dr. Robert McGuire