期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 124, 期 3, 页码 1806-1822出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018JA026196
关键词
Saturn's magnetosphere; interchange injections; energetic particles; plasma transport; rotational modulation; statistics
资金
- NSF Graduate Research Fellowship Program [DGE 1256260]
- NASA [1415150]
- Jet Propulsion Laboratory
- NASA Cassini program through JPL [1243218]
- STFC [ST/N000749/1]
- Southwest Research Institute
- STFC [ST/N000749/1] Funding Source: UKRI
Saturn's magnetosphere has been extensively studied over the past 13 years with the now retired Cassini mission. Periodic modulations in a variety of magnetospheric phenomena have been observed at periods close to those associated with the emission intensity of Saturn kilometric radiation (SKR). Resulting from Rayleigh-Taylor like plasma instabilities, interchange is believed to be the main plasma transport process in Saturn's inner to middle magnetosphere. Here we examine the organization of equatorially observed interchange events identified based on high-energy (3-22 keV) H+ intensifications by several longitude systems that have been derived from different types of measurements. The main question of interest here is as follows: Do interchange injections undergo periodicities similar to the Saturn kilometric radiation or other magnetospheric phenomena? We find that interchange shows enhanced occurrence rates in the northern longitude systems between 30 degrees and 120 degrees, particularly between 7 and 9 Saturn Radii. However, this modulation is small compared to the organization by local time. Additionally, this organization is weak and inconsistent with previous findings based on data with a limited time span.
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