THE AE-D DATA/SOFTWARE ON THE CD DISK ------------------------------------- This data set contains 15-second resolution atmospheric and ionospheric parameters from NASA's AE-D spacecraft, measured between October 06, 1975 and January 29, 1976. AE-D's geocentric orbit was elliptical as well as circular at times with a closest perigee of 154 km and a farthest apogee of 3816 km and with an inclination of 90.1 degrees. Each file includes one day of data. The file name corresponds to year, month, and day (of the month), for example, the file named c7511_15.DAT contains data for Novemver 15, 1975). AE-D DATA FORMAT Each file contains ASCII formatted data in logical records of variable length. Each file consists of a header record followed by seperate (multi-record) blocks of UA and orbit data. Each block contains the measurements for one individual parameter taken during the specific day; this parameter can be either a UA parameter or an orbit parameter. The header record contains the solar and magnetic indices for the day: yyddd I6 Five-digit number which specifies the year and day of year; Ap(1:9) 9I6 The eight planetary Ap indices for the given day and the daily Ap; Kp(1:9) 9I6 The eight planetary Kp indices for the given day and their sum; F10.7o F8.2 Observed solar radio flux (10.7 cm) F10.7c F8.2 Corrected solar radio flux (10.7 cm) The format statememt is: FORMAT (19I6, 2F8.2, 8X) The header is followed by data (UA and orbit) blocks of the following structure: IVAR I6 The integer code number for the specific parameter (see table below); IB I6 The running index number of the first 15-sec interval for which data are available for the specific parameter for the given day; 15-sec intervalls are numbered consecutively starting with 1 for the interval 0-15 sec, 2 for 16-30 sec, and so on; IE I6 The running index number for the last 15-sec interval for the specific parameter for the given day; ORBIT I6 Orbit number The format statement is: FORMAT(4I6); This first record of the data block is followed by N records containing the M (=IE-IB+1) measurments of the specific parameter during the given day. Each of the N records contains 15 values and therefore N = M/15+1. Data gaps are indicated with the fill-value 1.0E+35. The format statement is: FORMAT(15E10.3); TABLE OF UA/OA PARAMETERS FOR AE-D ---------------------------------- Code Description --------------------------------------------------------- 0 magnetic & solar activity parameters -1 altitude (kilometers) -2 latitude (degrees) -3 longitude (degrees) -4 local time (hours) -5 local magnetic time (hours) -6 L-shell parameter (earth radii) -7 geocentric magnetic inclination (degrees) -8 solar zenith angle (degrees) -9 orbit number 11. CEP - ELECTRON TEMPERATURE (DEG KELVIN) 12. CEP - ION DENSITY (NUM/CC) 13. CEP - VEHICLE POTENTIAL (VOLTS) ERROR BAR NOT ENCODED 14. CEP - MEAN ION MASS FROM ION CURRENT (AMU) 15. LEE - ELECTRON TOTAL ENERGY FLUX (ERGS/(SEC*CM**2*STER)) .2-.8 KEV 16. LEE - ELECTRON TOTAL ENERGY FLUX (ERGS/(SEC*CM**2*STER)) .8-2 KEV 17. LEE - ELECTRON TOTAL ENERGY FLUX (ERGS/(SEC*CM**2*STER)) 2-8 KEV 18. LEE - ELECTRON TOTAL ENERGY FLUX (ERGS/(SEC*CM**2*STER)) 8-30 KEV 19. LEE - ELECTRON AVERAGE ENERGY (KEV) 20. LEE - ELECTRON TOTAL PARTICLE FLUX (NUM/(SEC*CM**2*STER)) .2-30 KEV 21. LEE - PROTON TOTAL ENERGY FLUX (ERGS/(SEC*CM**2*STER)) .2-30 KEV 22. LEE - PROTON AVERAGE ENERGY (KEV) 23. LEE - PROTON TOTAL PARTICLE FLUX (NUM/(SEC*CM**2*STER)) .2-30 KEV 24. MESA - ATMOSPHERIC DENSITY (GM/CM**3) 25. MESA - TRANSVERSE WIND COMPONENT (M/SEC) 26. MIMS - H+ NUM/CM3 27. MIMS - D+ NUM/CM3 28. MIMS - HE+ NUM/CM3 29. MIMS - O++ NUM/CM3 30. MIMS - N+ NUM/CM3 31. MIMS - O+ NUM/CM3 32. MIMS - MG+ NUM/CM3 33. MIMS - N2+ NUM/CM3 34. MIMS - NO+ NUM/CM3 35. MIMS - O2+ NUM/CM3 36. NACE - N2 DENSITY (NUM/CM3) 37. NACE - O DENSITY (NUM/CM3) 38. NACE - HE DENSITY (NUM/CM3) 39. NACE - ARGON DENSITY (NUM/CM3) 40. NACE - SELECTION 1: INITIALLY NO DENSITY (NUM/CM3) 41. NACE - SELECTION 2: INITIALLY TOTAL OXYGEN (NUM/CM3) 42. NATE - NEUTRAL GAS TEMPERATURE (DEG KELVIN) 43. NATE - N2 DENSITY (NUM/CM3) 44. NATE - O+2*O2 TOTAL OXYGEN DENSITY (NUM/CM3) 45. NATE - HE DENSITY (NUM/CM3) 46. NATE - ARGON DENSITY (NUM/CM3) 47. NATE - UA WINDS (METERS/SEC, + IS EASTWARD) 49. OSS - N2 DENSITY (NUM/CM3) 50. OSS - O2 DENSITY (NUM/CM3) 51. OSS - HE DENSITY (NUM/CM3) 52. OSS - O DENSITY (NUM/CM3) 53. OSS - AR DENSITY (NUM/CM3) 54. OSS - X DENSITY OF SELECTED MASS (NUM/CM3) (IF X=32, X DENS. IS O/2+O2) 55. OSS - N DENSITY (NUM/CM3) 56. PES - AVERAGE FLUX 2-3 EV 57. PES - AVERAGE FLUX 7-9 EV 58. PES - AVERAGE FLUX 12-17 EV 59. PES - AVERAGE FLUX 25-30 EV 60. PES - AVERAGE FLUX 37-47 EV 61. PES - AVERAGE FLUX 100-500 EV 62. RPA - TI ... ION TEMPERATURE IN (DEG-KELVIN) 63. RPA - NP ... TOTAL (ION OR ELECTRON) PLASMA CONCENTRATION (CM-3) 64. RPA - VD ... PLASMA DRIFT VELOCITY NORMAL TO RPA (M/SEC) 65. RPA - PSI .. SATELLITE POTENTIAL (VOLTS) 66. RPA - VY ... TRANSVERSE VERTICAL ION VELOCITY ASSUMING VD=0.0 67. RPA - VZ ... TRANSVERSE HORIZONTAL ION VELOCITY ASSUMING VD=0.0 68. RPA - SIGMA .. ROUGHNESS PARAMETER (DELTA NI)/(NI) % 76. VAE - CH1 UP IF FILTER WHEEL FIXED; CH2 4278A IF STEPPING (RAYLEIGHS) 77. VAE - CH1 DOWN IF FILTER WHEEL FIXED; CH2 4861A IF STEPPING (RAYLEIGHS) 78. VAE - CH1 BACK IF FILTER WHEEL FIXED; CH2 5200A IF STEPPING (RAYLEIGHS) 79. VAE - CH1 FORWARD IF FILTER WHEEL FIXED; CH2 5577A IF STEPPING (RAYLEIGHS) 80. VAE - CH2 UP IF FILTER WHEEL FIXED; CH2 6300A IF STEPPING (RAYLEIGHS) 81. VAE - CH2 DOWN IF FILTER WHEEL FIXED; CH2 7319A IF STEPPING (RAYLEIGHS) -------------------------------------------------------------------- Use Directory "aedoc" to get detailed information about AE-D Spacecraft and each experiment. ------------------------------------------------------------------- Note that an FTPHelper interface to this dataset, providing data subsetting and and graphical browsing, is available at "https://omniweb.gsfc.nasa.gov/ftpbrowser/" --------------------------------------------------------------