Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 115, Issue -, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2010JA015510
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Funding
- JPL [NAS703001]
- STFC [ST/H00260X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H00260X/1] Funding Source: researchfish
- UK Space Agency [PP/D00084X/1, ST/G003203/1, ST/I002642/1, ST/G008906/1, ST/H004025/1, ST/I00274X/1] Funding Source: researchfish
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Since the days of Pioneer 11 and the Voyager missions, electrons have shown an unexplained peak in the data at approximately 7.5 Saturn radii (R-S). To investigate this peak, we examine near-equatorial electron energy flux data (+/- 10 degrees) from the Cassini Plasma Spectrometer Electron Spectrometer from 1 July 2004 through 10 August 2007. When these data are plotted versus L shell, a peak between L = 7.5 and L = 8 appears in the electron data in the 12-100 eV range. We show that this peak is associated with interchange injections. The electrons are separated into trapped (70 degrees-110 degrees) pitch angles and field-aligned (0 degrees-20 degrees and 160 degrees-180 degrees) pitch angles. The field-aligned electrons show stronger fluxes than the trapped electrons in the 12-100 eV range during these injections. In SLS3 coordinates, the trapped electrons peak at longitudes between 45 degrees and 240 degrees at 7-8 R-S with a smaller peak occurring between 310 degrees and 360 degrees SLS3 longitudes that penetrates to 6-5 R-S. The field-aligned electrons, however, show no SLS3 dependence.
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