Data Set Overview : Counting rate from the D2 detector in the Cosmic Ray System (CRS) electron telescope (TET) on Voyager 2 during the Neptune encounter. The D2 detector nominally responds to electrons with kinetic energies above approximately 2.5 MeV (see detector description for details). Parameters : Sampling parameter name : time Sampling parameter resolution : 6.0 seconds Minimum sampling parameter : n/a Maximum sampling parameter : n/a Sampling parameter interval : 96.0 seconds Minimum available sampling interval : 96.0 seconds Data set parameter name : D2 rate Noise level : 0.000 counts/second Data set parameter unit : counts/second 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. ------------------------------------------------------------------- Table 1. 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 Processing : The ENCYCLOPEDIA GENERATOR program was run by Nand Lal at Goddard Space Flight Center to read the EDR tape, check for error conditions, and reformat the data to generate a CRS encyclopedia tape. The resulting tape was sent to CalTech for subsequent data analysis. The VCRUSH program was run at CalTech to select data of interest from CRS encyclopedia tapes. In the case of counting rate data, no further analysis was done to produce the data in the PDS data sets. Note: Neither the ENCYCLOPEDIA GENERATOR or VCRUSH software are available for public use.

Data Confidence Overview : Each data point represents a six-second accumulation, so that the statistical uncertainty is obtained according to Poisson statistics by taking the square root of one sixth of the counting rate. However, larger uncertainties are associated with the conversion from counting rate to flux. Data Coverage and Quality : The following table contains hourly summaries of the percentage of the data available, data quality, and contamination codes. A data quality id of -1 indicates that no attempt has been made to specify a data quality for this time range. A contamination code of -1 signifies that no evaluation of possible contamination has been made. ------------------------------------------------------------------- Table 2. Hourly Data Coverage and Quality Summaries ------------------------------------------------------------------- Start Time Mode Percent Quality Contam NumGood ------------------------------------------------------------------- 1989-Aug-24 23:00:14 D2 72.972 -1 -1 81 1989-Aug-25 00:01:02 D2 102.702 -1 -1 114 1989-Aug-25 01:00:14 D2 89.189 -1 -1 99 1989-Aug-25 02:01:02 D2 102.702 -1 -1 114 1989-Aug-25 03:00:14 D2 78.378 -1 -1 87 1989-Aug-25 04:01:02 D2 97.297 -1 -1 108 1989-Aug-25 05:00:14 D2 100.000 -1 -1 111 1989-Aug-25 06:01:02 D2 102.702 -1 -1 114 1989-Aug-25 07:00:14 D2 81.081 -1 -1 90 1989-Aug-25 08:01:02 D2 97.297 -1 -1 108 1989-Aug-25 09:00:14 D2 91.891 -1 -1 102 1989-Aug-25 09:57:50 D2 100.000 -1 -1 111