CCSD3ZF0000100000001CCSD3FF0000500000001CCSD3CS00004markeraa ADIDNAME = NSSD0184; CCSD$$MARKERmarkeraaNSSD3KS00020markerbb ADIDNAME = NSSD0184; REVISION_NUMBER = 0; SUBMISSION_DATE = 1993-06-17; REGISTRATION_DATE = 1993-06-22; REVISABLE = Y; RELEASABLE = Y; EXPECTED_RELEASE_DATE = 1993-06-22; BRIEF_TITLE="DE 1, High Alt. Plasma Instr. (HAPI) data format"; BRIEF_DESCRIPTION = "Format for data files of Dynamics Explorer 1 (DE 1) High Altitude Plasma Instrument (HAPI)"; REVISION_COMMENT = "Original"; GROUP = REGISTRANT; TITLE = ""; FIRST_NAME = Josephine; MIDDLE_NAME = N.; LAST_NAME = Humphreys; AFFILIATION = "NASA - Goddard Space Flight Center"; GROUP = ADDRESS; ADDRESS_LINE = "Josephine N. Humphreys"; ADDRESS_LINE = "Code 696"; ADDRESS_LINE = "NASA - Goddard Space Flight Center"; ADDRESS_LINE = "Greenbelt, MD 20771"; ADDRESS_LINE = "USA"; END_GROUP; GROUP = EMAIL_ADDRESS; NETWORK = NSI/DECnet; NET_ADDRESS = "LEPVAX::XRJNH"; END_GROUP; GROUP = EMAIL_ADDRESS; NETWORK = INTERNET; NET_ADDRESS = "xrjnh@lepvax.gsfc.nasa.gov"; END_GROUP; PHONE = "+1-301-286-8916"; FAX = "+1-301-286-1648"; /* ^^ |-- For international calls. */ END_GROUP = REGISTRANT; GROUP = REVISOR ; TITLE = ""; FIRST_NAME = Josephine; MIDDLE_NAME = N.; LAST_NAME = Humphreys; AFFILIATION = "NASA - Goddard Space Flight Center"; GROUP = ADDRESS; ADDRESS_LINE = "Josephine N. Humphreys"; ADDRESS_LINE = "Code 696"; ADDRESS_LINE = "NASA - Goddard Space Flight Center"; ADDRESS_LINE = "Greenbelt, MD 20771"; ADDRESS_LINE = "USA"; END_GROUP; GROUP = EMAIL_ADDRESS; NETWORK = NSI/DECnet; NET_ADDRESS = "LEPVAX::XRJNH"; END_GROUP; GROUP = EMAIL_ADDRESS; NETWORK = INTERNET; NET_ADDRESS = "xrjnh@lepvax.gsfc.nasa.gov"; END_GROUP; PHONE = "+1-301-286-8916"; FAX = "+1-301-286-1648"; /* ^^ |-- For international calls. */ END_GROUP = REVISOR; REFERENCED_ADID = 0; PROJECT_NAME = ""; MISSION_NAME = "Dynamics Explorer 1 (DE 1)"; INSTRUMENT_NAME = "High Altitude Plasma Instrument (HAPI)"; CCSD$$MARKERmarkerbbCCSD3DS00002markercc FILE_ATTRIBUTES: Fixed length, sequential file. RECORD_LENGTH: 5704 bytes DESCRIPTION_OF_THE_FILE: Each SATM record contains HAPI data from one DE-1 major telemetry frame (8 seconds) of data. FILE_STRUCTURE: STRUCTURE_OF_THE_DATA_RECORD: VI4 = VAX INTEGER*4 VR4 = VAX REAL*4 VL1 = VAX LOGICAL*1 BYTE CONTENTS TYPE VALUE COMMENTS/ NUMBER RANGE UNITS 1-4 DATE VI4 81233 - 81336 yyddd 5-8 TIME VI4 0 - 86400000 milliseconds (time that the 1st measurement of the sweep was completed) 9 FLAG VL1 8,64,72,128, status flag 192,200 10-13 Invariant Latitude (IL) VR4 0 - 90 degrees above ~87 fill data 9999999 14-17 Magnetic Local Time (MLT) VR4 0 - 24 hours 18-21 Altitude (ALT) VR4 600 - 25,000 kilometers 22-25 Latitude (LAT) VR4 -90 - 90 degrees 26-29 Longitude (LON) VR4 0 - 360 degrees 30-33 Local Solar Time VR4 0 - 24 hours 34-37 L-Shell Value VR4 1 - 100 Earth Radii above 100 fill data 9999999 38-41 Orbit Number VR4 0 - 13,000 42-45 GEI Satellite Speed VR4 3 - 8 km/sec 46-49 Solar Zenith Angle (SZA) VR4 -90 - 90 degrees 50 Dark/Light Indicator VL1 0, 1 true/false 51 Number of Sensors VL1 0 - 10 52 Mode VL1 0, 1 53-1076 Magnetic Field Data VR4 Gauss REAL*4 B(2,128) B(i,j) 128 sets per major frame i=1,2(Bphi,Btheta) 16 sets per second j=1,128 (time) 1077-1084 Nadir (2 values) VI4 0 - 86400000 millisec <0 no nadir 1085 PPS Start Value VL1 1 - 64 1086 PPS Stop Value VL1 1 - 64 1087 PPS Skip Value VL1 0,1,3,7,15,31 1088 PPS Steps Per Second VL1 1,2,4,8,16,32,64 1089-1096 Sensor Identification VL1 0 - 9 >9 error 1097-5192 Science Data VL1 0 - 255 telemetry bits Telemetered Counts 5193-5704 PPS data VL1 0 - 255 telemetry bits DESCRIPTION: HAPI SATM contents DATE: YRDAY, where YR is the last two digits of the year, and DAY is the Julian day. TIME: Beginning of time in milliseconds for a major frame FLAG: BYTE VALUE COMMENT 3 8 bad sensor id 5 64 sensors do not compare with previous major frame (excluding field-aligned detectors) 6 128 time gap between records >= 9 seconds For more that one error the flag values are added (i.e. 8 + 64 = 72) INVARIANT LATITUDE (IL): Invariant Latitude in degrees MAGNETIC LOCAL TIME (MLT): Spacecraft Magnetic Local Time in hours ALTITUDE (ALT): Spacecraft Altitude in kilometers LATITUDE (LAT): Spacecraft Latitude in degrees LONGITUDE (LON): Spacecraft Longitude in degrees LOCAL SOLAR TIME (LST): Spacecraft Local Solar Time in hours L SHELL: ORBIT NUMBER: Orbit Number of the pass GEI SATELLITE SPEED: Spacecraft Speed in Kilometers/Second calculated from the GEI velocity vector. SOLAR ZENITH ANGLE (SZA): DARK/LIGHT INDICATOR: NUMBER OF SENSORS: typically 8 MODE: 0 for normal, and 1 for spin synchronization MAGNETIC FIELD DATA: REAL*4 B(2,128). First array index indicates (1)Bphi or (2)Btheta. Magnetic Field calculated from DE-2 Magnetometer Telemetry. NADIR: Should be only one nadir value per record, however space was left for 2 values. Values less than zero indicate no nadir. PPS START VALUE: Starting energy step level for PPS (typically 1) PPS STOP VALUE: Ending energy step level for PPS (typically 61) PPS SKIP VALUE: Skip value for PPS PPS STEP VALUE: Steps per second for PPS SENSOR IDENTIFICATION: HAPI has 10 sensors(0-9) of which 5 (even numbered) are electron detectors and 5 (odd numbered) are ion detectors. SENSOR NUMBERS PITCH ANGLE ELECTRON ION (DEGREES) 0 1 90 2 3 78 4 5 102 6 7 45 8 9 135 SCIENCE DATA: LOGICAL*1 TM_COUNTS(4096) This array will contain the telemetered counts for the HAPI electrostatic analyzers. In order to determine the actual counts from the telemetered counts, use the lookup table provided below. TM ACTUAL TM ACTUAL TM ACTUAL TM ACTUAL VALUE COUNTS VALUE COUNTS VALUE COUNTS VALUE COUNTS 0 n/a 64 64.5 128 1054.5 192 16894.5 1 n/a 65 68.5 129 1118.5 193 17918.5 2 0 66 72.5 130 1182.5 194 18942.5 3 n/a 67 76.5 131 1246.5 195 19966.5 4 1 68 80.5 132 1310.5 196 20990.5 5 n/a 69 84.5 133 1374.5 197 22014.5 6 2 70 88.5 134 1438.5 198 23038.5 7 n/a 71 92.5 135 1502.5 199 24062.5 8 3 72 96.5 136 1566.5 200 25086.5 9 n/a 73 100.5 137 1630.5 201 26110.5 10 4 74 104.5 138 1694.5 202 27134.5 11 n/a 75 108.5 139 1758.5 203 28158.5 12 5 76 112.5 140 1822.5 204 29182.5 13 n/a 77 116.5 141 1886.5 205 30206.5 14 6 78 120.5 142 1950.5 206 31230.5 15 n/a 79 124.5 143 2014.5 207 32254.5 16 7 80 130.5 144 2110.5 208 33790.5 17 n/a 81 138.5 145 2238.5 209 35838.5 18 8 82 146.5 146 2366.5 210 37886.5 19 n/a 83 154.5 147 2494.5 211 39934.5 20 9 84 162.5 148 2622.5 212 41982.5 21 n/a 85 170.5 149 2750.5 213 44030.5 22 10 86 178.5 150 2878.5 214 46078.5 23 n/a 87 186.5 151 3006.5 215 48126.5 24 11 88 194.5 152 3134.5 216 50174.5 25 n/a 89 202.5 153 3262.5 217 52222.5 26 12 90 210.5 154 3390.5 218 54270.5 27 n/a 91 218.5 155 3518.5 219 56318.5 28 13 92 226.5 156 3646.5 220 58366.5 29 n/a 93 234.5 157 3774.5 221 60414.5 30 14 94 242.5 158 3902.5 222 62462.5 31 n/a 95 250.5 159 4030.5 223 64510.5 32 15 96 262.5 160 4222.5 224 67582.5 33 16 97 278.5 161 4478.5 225 71678.5 34 17 98 294.5 162 4734.5 226 75774.5 35 18 99 310.5 163 4990.5 227 79870.5 36 19 100 326.5 164 5246.5 228 83966.5 37 20 101 342.5 165 5502.5 229 88062.5 38 21 102 358.5 166 5758.5 230 92158.5 39 22 103 374.5 167 6014.5 231 96254.5 40 23 104 390.5 168 6270.5 232 100351 41 24 105 406.5 169 6526.5 233 104447 42 25 106 422.5 170 6782.5 234 108543 43 26 107 438.5 171 7038.5 235 112639 44 27 108 454.5 172 7294.5 236 116735 45 28 109 470.5 173 7550.5 237 120831 46 29 110 486.5 174 7806.5 238 124927 47 30 111 502.5 175 8062.5 239 129023 48 31.5 112 526.5 176 8446.5 240 135167 49 33.5 113 558.5 177 8958.5 241 143359 50 35.5 114 590.5 178 9470.5 242 151551 51 37.5 115 622.5 179 9982.5 243 159743 52 39.5 116 654.5 180 10494.5 244 167935 53 41.5 117 686.5 181 11006.5 245 176127 54 43.5 118 718.5 182 11518.5 246 184319 55 45.5 119 750.5 183 12030.5 247 192511 56 47.5 120 782.5 184 12542.5 248 200703 57 49.5 121 814.5 185 13054.5 249 208895 58 51.5 122 846.5 186 13566.5 250 217087 59 53.5 123 878.5 187 14078.5 251 225279 60 55.5 124 910.5 188 14590.5 252 233471 61 57.5 125 942.5 189 15102.5 253 241663 62 59.5 126 974.5 190 15614.5 254 249855 63 61.5 127 1006.5 191 16126.5 255 258047 PPS DATA: LOGICAL*1 TM_PPS(512) This provides the telemetered value corresponding to the energy for a step inside a particular sweep. In order to obtain the energy from the telemetered pps value, use the table below. Also provided is the electron efficiency factor for the various energy levels. This is used in the flux calculations discussed in a later section. TM ENERGY Electron TM ENERGY Electron VALUE (eV) Efficiency VALUE (eV) Efficiency 0 31,143.75 0.26453 32 313.27 0.88931 1 26,993.75 0.28030 33 271.21 0.89889 2 23,381.25 0.29687 34 234.64 0.90742 3 20,250.00 0.31418 35 203.02 0.91488 4 17,531.25 0.33226 36 175.66 0.92133 5 15,212.50 0.35076 37 152.24 0.92678 6 13,206.25 0.36988 38 132.03 0.93138 7 11,425.00 0.39015 39 114.19 0.93531 8 9,900.00 0.41084 40 98.931 0.93852 9 8,581.25 0.43209 41 85.700 0.94118 10 7,425.00 0.45416 42 74.188 0.94337 11 6,465.00 0.47674 43 64.256 0.94514 12 5,568.75 0.49949 44 55.656 0.94658 13 4,831.25 0.52243 45 48.281 0.94774 14 4,187.50 0.54578 46 41.913 0.94868 15 3,625.00 0.56951 47 36.306 0.94945 16 3,121.25 0.59419 48 31.306 0.95009 17 2,701.88 0.61792 49 27.163 0.95059 18 2,338.75 0.64148 50 23.569 0.95100 19 2,025.00 0.66468 51 20.444 0.95133 20 1,753.13 0.68747 52 17.763 0.95159 21 1,520.00 0.70946 53 15.444 0.95181 22 1,319.38 0.73061 54 13.463 0.95199 23 1,141.25 0.75147 55 11.688 0.95214 24 984.38 0.77179 56 10.156 0.95227 25 853.13 0.79045 57 8.844 0.95237 26 738.69 0.80815 58 7.719 0.95245 27 639.56 0.82472 59 6.706 0.95252 28 553.63 0.84014 60 5.875 0.95258 29 480.31 0.85414 61 5.138 0.95263 30 416.75 0.86697 62 4.525 0.95267 31 360.13 0.87897 63 n/a n/a PROCESSING_DATA: CONVERTING COUNTS TO FLUX: a) Differential Number Flux (J): J = C / (GF * eff * del_T * del_E) where: C - counts per accumulated interval GF - Geometric factor = 2.16E-4 cm**2 sr eff - efficiency factor = 0.65 for ions from look-up table for electrons, function of energy (see PPS table above) del_T - accumulation interval = 1.27E-2 sec (64 steps/sec) del_E = width * E (where E is the center energy of the step) SENSOR # width 0 0.32 1 0.27 2 0.30 3 0.22 4 0.34 5 0.23 6 0.32 7 0.22 8 0.30 9 0.23 b) Differential Energy Flux Differential Energy Flux = J * E * 1.602E-12 (ergs/eV) where: J = Differential Number Flux E = center energy of the step c) Phase Space Density Phase Space Density = A4 * J / E where: A4 = 1.616E-19 for electrons = 5.448E-13 for ions J = Differential Number Flux E = center energy of the step ACTUAL PITCH ANGLE OF A DETECTOR: Pitch Angle = arc cos ( sin(thetaD) * sin(thetaB) * cos(phi + omega * t - 30) - cos(thetaD) * cos(thetaB) ) where: thetaD = angle of detector with respect to the z-axis thetaB = Btheta phi = Bphi omega = angular velocity (in degrees/sec) = 360 degrees / spin period in seconds t = time difference (from last Bphi,Btheta calculation) FORMAT_APPLY_SCOPE: This format applies to all the files under the [HAPI] subdirectories. UTILITY_TO_UNPACK_THE_DATA: The utility is included in the REDUCE_SATM file in the root directory. UTILITY_APPLY_SCOPE: This utility applies to all the files under the [HAPI] subdirectories. CCSD$$MARKERmarkercc