/********************* D1 Rate Parameter Information **************************/ /* MODIFICATIONS: /* 920806 JPLPDS::RMONARREZ /* received by mail /* 92-08 EFRIED /* 920916 EFRIED /* last changes made /* Template: Parameter Template Rev: 19890121 */ /* */ /* Note: This template shall be completed for each combination */ /* of data set parameter name, instrument parameter */ /* name and instrument host id associated with a dataset. */ /* */ /* Hierarchy: PARAMETER */ OBJECT = PARAMETER INSTRUMENT_HOST_ID = "VG1" DATA_SET_PARAMETER_NAME = "D1 RATE" INSTRUMENT_PARAMETER_NAME = "D1 RATE" IMPORTANT_INSTRUMENT_PARMS = 1 END_OBJECT = PARAMETER OBJECT = PARAMETER INSTRUMENT_HOST_ID = "VG2" DATA_SET_PARAMETER_NAME = "D1 RATE" INSTRUMENT_PARAMETER_NAME = "D1 RATE" IMPORTANT_INSTRUMENT_PARMS = 1 END_OBJECT = PARAMETER /********************** D1 Rate Parameter Description *************************/ /* MODIFICATIONS: /* 920806 JPLPDS::RMONARREZ /* received by mail /* 92-08 EFRIED /* 920916 EFRIED /* last changes made /* Template: Data Set Instrument Parameter Description Template Rev: 19890121 */ /* */ /* Note: This template shall be completed for any */ /* data set or instrument parameter description. */ /* */ /* Hierarchy: DSINSTPARMD */ OBJECT = DSINSTPARMD DATA_SET_OR_INSTRUMENT_PARM_NM = "D1 RATE" DATA_SET_OR_INST_PARM_DESC = " The D1 rate is the counting rate from the D1 detector of the Cosmic Ray System (CRS) electron telecope (TET). When the rate is above background it is approximately proportional to the omnidirectional flux of electrons with kinetic energy greater than ~1 MeV. To obtain an accurate flux the D1 calibration tables should be used (see below). When the rate is near background, the background rate should be subtracted. The background rate is due to gamma rays generated in the spacecraft RTG and to penetrating cosmic rays. It varies slightly with time on the time scale of months, but is generally near 25 counts per second. When the rate is near saturation, corrections for discriminator deadtime should be made. The discriminator deadtime is approximately 20 micro-seconds (it varies slightly with the electron energy spectrum), so that the saturation level is approximately 50,000 counts per second. When the correction is near a factor of two or less a reliable corrected rate can be obtained from the formula {corrected rate} = {uncorrected rate}/(1+deadtime*{uncorrected rate}) When the deadtime correction is substantially larger than a factor of two, reliable corrections are not available. In this case, electron pileup and baseline shift may also be important, which may increase or decrease the expected rate. The data points are 6 second averages taken once every 96 seconds. The table below provides the D1 response function R(E,theta) which is a function of electron energy E in MeV (column at left) and angle theta in degrees from the TET axis (row at top). Each table entry is R in cm**2 for the corresponding E and theta. The D1 electron rate is related to the differential intensity j(E,alpha) in (cm**2 s sr MeV)**-1, where alpha is the electron pitch-angle, by integrating the product R*j over E and solid angle. Note that the angle between the TET axis and the local magnetic field direction is also required. The D1 RATE is then obtained by adding the background rate and applying the inverse of the deadtime correction described above. At energies above the maximum provided R can be approximated by the value at the highest provided energy. At angles above the maximum provided R can be approximated by zero. D1 response function: | 11. 15. 23. 32. 41. 51. 61. ______|________________________________________________ | 0.618 | 0.014 0.005 0.007 0.007 0.006 0.003 0.001 0.801 | 0.151 0.134 0.103 0.087 0.038 0.016 0.008 0.989 | 1.384 1.440 1.219 0.998 0.610 0.311 0.143 1.179 | 2.233 2.402 2.095 1.796 1.255 0.689 0.380 1.372 | 2.829 2.938 2.593 2.241 1.636 0.956 0.583 1.567 | 3.212 3.283 2.936 2.536 1.940 1.167 0.724 1.763 | 3.495 3.534 3.206 2.772 2.161 1.356 0.860 1.959 | 3.708 3.705 3.404 2.964 2.357 1.495 0.969 2.157 | 3.620 3.790 3.452 3.053 2.427 1.602 1.049 2.355 | 3.995 3.948 3.576 3.231 2.617 1.758 1.155 2.553 | 4.096 4.091 3.735 3.395 2.735 1.875 1.263 2.752 | 4.154 4.098 3.808 3.426 2.792 1.927 1.298 2.951 | 4.043 4.054 3.727 3.371 2.819 1.951 1.339 3.150 | 3.946 4.029 3.700 3.335 2.648 1.956 1.358 3.350 | 3.876 4.194 3.611 3.573 2.863 1.927 1.290 | 70. 80. 90. 100. ______|____________________________ | 0.618 | 0.002 0.001 0.000 0.000 0.801 | 0.010 0.007 0.004 0.001 0.989 | 0.163 0.095 0.047 0.018 1.179 | 0.386 0.217 0.113 0.056 1.372 | 0.526 0.301 0.163 0.087 1.567 | 0.617 0.366 0.201 0.117 1.763 | 0.679 0.413 0.241 0.146 1.959 | 0.730 0.461 0.270 0.179 2.157 | 0.760 0.484 0.296 0.207 2.355 | 0.809 0.518 0.329 0.242 2.553 | 0.836 0.551 0.363 0.292 2.752 | 0.856 0.564 0.392 0.319 2.951 | 0.845 0.548 0.401 0.348 3.150 | 0.837 0.559 0.400 0.374 3.350 | 0.792 0.486 0.440 0.375" END_OBJECT = DSINSTPARMD /******************* D2 Rate Parameter Information ****************************/ /* MODIFICATIONS: /* 920806 JPLPDS::RMONARREZ /* received by mail /* 92-08 EFRIED /* 920916 EFRIED /* last changes made /* Template: Parameter Template Rev: 19890121 */ /* */ /* Note: This template shall be completed for each combination */ /* of data set parameter name, instrument parameter */ /* name and instrument host id associated with a dataset. */ /* */ /* Hierarchy: PARAMETER */ OBJECT = PARAMETER INSTRUMENT_HOST_ID = "VG1" DATA_SET_PARAMETER_NAME = "D2 RATE" INSTRUMENT_PARAMETER_NAME = "D2 RATE" IMPORTANT_INSTRUMENT_PARMS = 1 END_OBJECT = PARAMETER OBJECT = PARAMETER INSTRUMENT_HOST_ID = "VG2" DATA_SET_PARAMETER_NAME = "D2 RATE" INSTRUMENT_PARAMETER_NAME = "D2 RATE" IMPORTANT_INSTRUMENT_PARMS = 1 END_OBJECT = PARAMETER /************************ D2 Rate Parameter Description ***********************/ /* MODIFICATIONS: /* 920806 JPLPDS::RMONARREZ /* received by mail /* 92-08 EFRIED /* 920916 EFRIED /* last changes made /* Template: Data Set Instrument Parameter Description Template Rev: 19890121 */ /* */ /* Note: This template shall be completed for any */ /* data set or instrument parameter description. */ /* */ /* Hierarchy: DSINSTPARMD */ OBJECT = DSINSTPARMD DATA_SET_OR_INSTRUMENT_PARM_NM = "D2 RATE" DATA_SET_OR_INST_PARM_DESC = " The D2 detector is located behind the D1 detector in the TET telescope, so that most of the electrons observed by D2 have to penetrate D1 first. The D2 rate therefore applies to higher energy electrons and the threshold energy is less distinct than for D1, but is near 2.5 MeV. The rate can be calculated from the electron differential flux in the same way as the D1 RATE (see D1 RATE description) with the following calibration table. D2 response function: | 11. 23. 41. 61. 80. 90. 100. ________|_________________________________________________ | 0.989 | 0.000 0.000 0.000 0.001 0.002 0.001 0.001 1.179 | 0.000 0.000 0.000 0.013 0.023 0.021 0.018 1.372 | 0.000 0.000 0.000 0.037 0.052 0.051 0.043 1.567 | 0.000 0.019 0.028 0.063 0.082 0.066 0.061 1.763 | 0.041 0.034 0.045 0.090 0.111 0.098 0.080 1.959 | 0.106 0.078 0.072 0.119 0.142 0.125 0.097 2.157 | 0.255 0.186 0.127 0.152 0.170 0.146 0.109 2.355 | 0.488 0.381 0.228 0.206 0.212 0.176 0.126 2.553 | 0.772 0.627 0.361 0.272 0.255 0.202 0.139 2.752 | 1.019 0.864 0.501 0.340 0.299 0.226 0.152 2.951 | 1.220 1.053 0.634 0.400 0.335 0.250 0.165 3.150 | 1.461 1.218 0.746 0.459 0.375 0.289 0.188 3.350 | 1.628 1.378 0.940 0.515 0.456 0.411 0.282" END_OBJECT = DSINSTPARMD