Voyager 2 Saturn Low Energy Charged Particle (LECP) Near Encounter, 0.4 s High Resolution Data

* Data Set Overview\n* =================\n\n* Data Set Description\n* ====================\n\nThis Near Encounter Data Set consists of Electron and Ion Counting Rate Data from the Low Energy Charged Particle (LECP) Experiment on Voyager 2 while the Spacecraft was within the very close Vicinity of Saturn.\n\nThe LECP Instrument measures the Intensities of in situ Charged Particles (>13 keV Electrons and >24 keV Ions) with various Levels of Discrimination based on Energy Range, Mass Species, and angular Arrival Direction. A Subset of almost 100 LECP Channels are included in this Data Set. The LECP Data are globally calibrated to the extent possible (see below).\n\nDuring the Saturn Near Encounter, the Low Energy Magnetospheric Particle Analyzer (LEMPA) Subsystem was turned on for Data Collection. Particles include Low Energy Electrons, Protons, Alpha Particles, Medium Energy Protons and Ions, High Energy and High Intensity Protons, Electrons, Alpha Particles, and Z≥2 Nuclei Particles. The Near Encounter Data are 0.4 s Rate Measurements within one eighth of the LECP instrumental Motor Rotation Period (the angular Scanning Period or Step Period).\n\nThe LECP Instrument has a rotating Head for obtaining angular Anisotropy Measurements of the Medium Energy Charged Particles. A gear-drive Motor steps through eight equal angular Sectors per Revolution for Data Collection.\n\nThe Cycle Time for the Rotation is 25.6 min or 48 min during Cruise Mode, and 48 s or 192 s during the Planetary Encounter.\n\nThe Data were originally collected in the Form of "Rate" Data which were not always converted to the usual Physical Units. The Reason is that such a Conversion would depend on uncertain Determinations such as the Mass Species of the Particles and the Level of the Background. Both the Mass Species and the Background are generally determined from context during the Study of particular Regions. To convert "Rate" to "Intensity" for a particular Channel, one performs the following Tasks:\n\n* 1) Decide on the Level of Background Contamination and subtract that off the given Rate Level. The Background is to be determined from context and from making use of Sector 8 Rates (Sector 8 is covered by a 2 mm Aluminium Sunshield and is used for Data Calibration).\n* 2) Divide the Background-corrected Rate by the Geometric Factor of the Channel and by the Energy Bandpass of the Channel.\n\nThe Geometric Factor is found in the Entry for CHANNEL_GEOMETRIC_FACTOR as associated with the CHANNEL_ID of each Channel.\n\nTo determine the Energy Bandpass, one must judge the Mass Species of the detected Particles (for Ions but not for Electrons). The Energy Bandpasses are given in the Entries MINIMUM_INSTRUMENT_PARAMETER and MAXIMUM_INSTRUMENT_PARAMETER in Table FPLECPENERGY, and are given in the Form of "Energy per Nucleon". For Channels that begin their Names with the Designations "CH", these Bandpasses can be used on Mass Species that are accepted into that Channel. See the Entries for MINIMUM_INSTRUMENT_PARAMETER and MAXIMUM_INSTRUMENT_PARAMETER in Table FPLECPCHANZ, which give the Minimum and Maximum "Z" Value accepted. Note that these Entries are Blank for Electron Channels. For other Channels the given Bandpass refers only to the lowest Z Value accepted. The Bandpasses for other Z Values are not all known, but some are given in the Literature (e.g., Krimigis et al., (1979a)). The final Product of these Instructions will be the Particle Intensity in Units of counts/(cm^2 s sr keV). LECP Data can also be expressed in the Form of Flux, whose Units are (cm^2 s sr)^-1.\n\n* Near Encounter Channel Definitions for Voyager 2 LECP\n* =====================================================\n\n+-----------------------------------------------------------------------------------------------------------------+\n| CH Num | CH Name | Low (MeV/n) | High (MeV/n) | Mean (MeV/n) | Geometric Factor (cm^2 sr) | CH Logic Definition |\n-------------------------------------------------------------------------------------------------------------------\n| 1      | EB01    | 0.013       | 0.035        | 0.020        | 0.00200                    |                     |\n| 2      | EBD1    | 0.013       | 0.035        | 0.020        | 0.00200                    |                     |\n| 3      | EB02    | 0.035       | 0.061        | 0.045        | 0.00200                    |                     |\n| 4      | EBD2    | 0.035       | 0.061        | 0.045        | 0.00200                    |                     |\n| 5      | EB03    | 0.061       | 0.112        | 0.090        | 0.00200                    |                     |\n| 6      | EBD3    | 0.061       | 0.112        | 0.090        | 0.00200                    |                     |\n| 7      | EB04    | 0.112       | 0.183        | 0.120        | 0.00200                    |                     |\n| 8      | EBD4    | 0.112       | 0.183        | 0.120        | 0.00200                    |                     |\n| 9      | EB05    | 0.183       | 0.500        | 0.200        | 0.00200                    |                     |\n| 10     | EBD5    | 0.183       | 0.500        | 0.200        | 0.00200                    |                     |\n| 11     | EG06    | 0.252       | 2.000        | 0.250        | 0.00200                    |                     |\n| 12     | EG07    | 0.480       | 2.000        | 0.500        | 0.00200                    |                     |\n| 13     | EG08    | 0.853       | 2.000        | 0.900        | 0.00200                    |                     |\n| 14     | EG09    | 2.100       | 5.000        | 2.000        | 0.00200                    |                     |\n| 15     | E44     | 0.350       | 1.500        | 0.500        | 1.31000                    |                     |\n| 16     | E45     | 2.000       | 100.000      | 2.000        | 1.31000                    |                     |\n| 17     | E37     | 6.000       | 100.000      | 6.000        | 1.31000                    |                     |\n| 18     | PL01    | 0.024       | 0.048        | 0.025        | 0.12000                    |                     |\n| 19     | PL02    | 0.048       | 0.080        | 0.050        | 0.12000                    |                     |\n| 20     | PL03    | 0.080       | 0.137        | 0.100        | 0.12000                    |                     |\n| 21     | PL04    | 0.137       | 0.215        | 0.150        | 0.12000                    |                     |\n| 22     | PL05    | 0.215       | 0.540        | 0.250        | 0.12000                    |                     |\n| 23     | PL06    | 0.540       | 0.990        | 0.600        | 0.12000                    |                     |\n| 24     | PL07    | 0.990       | 2.140        | 1.000        | 0.12000                    |                     |\n| 25     | PL08    | 2.140       | 3.500        | 2.500        | 0.12000                    |                     |\n| 44     | AL01    | 1.040       | 1.850        | 1.000        | 0.12000                    | CALC.               |\n| 45     | AL02    | 1.850       | 3.700        | 2.500        | 0.12000                    | CALC.               |\n| 77     | ESA0    | 2.500       | 99.999       | 2.500        | 0.49350                    | A-B Coincidence     |\n| 78     | ESB0    | 8.500       | 99.999       | 8.500        | 0.94620                    | B 4π sr        |\n| 79     | AB10    | 8.500       | 99.999       | 8.500        | 0.05040                    | A-B Coincidence     |\n| 80     | DP09    | 0.285       | 5.020        | 0.250        | 0.00084                    | Delta'         |\n| 81     | DP10    | 0.480       | 2.580        | 0.600        | 0.00084                    | Delta'         |\n| 82     | DP11    | 0.725       | 1.640        | 1.000        | 0.00084                    | Delta'         |\n| 83     | PD09    | 0.285       | 5.250        | 0.250        | 0.00260                    | Delta               |\n| 84     | PD10    | 0.480       | 2.720        | 0.600        | 0.00260                    | Delta               |\n| 85     | PD11    | 0.725       | 1.580        | 1.000        | 0.00260                    | Delta               |\n| 86     | AB12    | 54.000      | 87.300       | 50.000       | 0.05040                    | A-B Coincidence     |\n| 87     | AB13    | 87.300      | 152.000      | 100.000      | 0.05040                    | A-B Coincidence     |\n| 88     | PSA1    | 15.800      | 158.000      | 15.000       | 0.49350                    | A 2π sr        |\n| 89     | PSA2    | 15.800      | 49.000       | 25.000       | 0.49350                    | A 2π sr        |\n| 90     | PSA3    | 16.300      | 26.200       | 25.000       | 0.49350                    | A 2π sr        |\n| 91     | PSB1    | 54.000      | 174.000      | 50.000       | 0.94620                    | B 4π sr        |\n| 92     | PSB2    | 54.000      | 87.300       | 50.000       | 0.94620                    | B 4π sr        |\n| 93     | PSB3    | 54.000      | 59.000       | 50.000       | 0.94620                    | B 4π sr        |\n| 94     | DA03    | 0.480       | 2.450        | 0.600        | 0.00084                    | Delta'         |\n| 95     | DA04    | 0.780       | 1.410        | 1.000        | 0.00084                    | Delta'         |\n| 96     | DZ01    | 0.405       | 18.800       | 0.600        | 0.00084                    | Delta'         |\n| 97     | AD03    | 0.480       | 2.580        | 0.600        | 0.00260                    | Delta               |\n| 98     | AD04    | 0.780       | 1.480        | 1.000        | 0.00260                    | Delta               |\n| 99     | ZD01    | 0.400       | 19.800       | 0.600        | 0.00260                    | Delta               |\n+-----------------------------------------------------------------------------------------------------------------+\n\n* Near Encounter Data are stored in Files for Channels from different Rate Groups as indicated by the File Name\n* =============================================================================================================\n\n+-----------------------------------------+\n| V2YYDOY{A,B,...,H}NG0{1,2, ..., 9}.CSV  |\n-------------------------------------------\n| ------- ---------     -----------       |\n| ! ! !   !             !                 |\n| ! ! !   !             Rate Group Number |\n| ! ! !   !                               |\n| ! ! !   Starting Time A: 00:00:00       |\n| ! ! !                 B: 03:00:00       |\n| ! ! !                 C: 06:00:00       |\n| ! ! !                 D: 09:00:00       |\n| ! ! !                 E: 12:00:00       |\n| ! ! !                 F: 15:00:00       |\n| ! ! !                 G: 18:00:00       |\n| ! ! !                 H: 21:00:00       |\n| ! ! !                                   |\n| ! !  3-Digit Day of Year                |\n| ! !                                     |\n| ! 2-Digit Year                          |\n| !                                       |\n| Voyager 2                               |\n+-----------------------------------------+\n\n* Rate Group Definitions\n* ======================\n\n+--------------------------------------------------------------------+\n| Rate Group Number | Channel Names in the Rate Group                |\n----------------------------------------------------------------------\n| 1                 | PL01  PL02  PL03  EB04  EBP04                  |\n| 2                 | EB01  EBP01 EB02  EBP02 EB03  EBP03 EG06       |\n| 3                 | PD09  DP09  PD10  DP10  PD11  DP11  AD03  DA03 |\n| 4                 | EG07  EG08  EG09  EB05  EBP05                  |\n| 5                 | PSA3  PSB3  AB12  AB13                         |\n| 6                 | PL04  ZD01  DZ01  ESA0  ESB0                   |\n| 7                 | PSA1  PSB1  PSA2  PSB2                         |\n| 8                 | AL01  AL02  PL08  AD04  DA04                   |\n| 9                 | AB10  PL05  PL06  PL07                         |\n+--------------------------------------------------------------------+

Tags: energeticparticles
Organization: National Aeronautics and Space Administration