期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 117, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2012JA017835
关键词
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资金
- Radio and Space Plasma Physics group
- STFC [PP/E000983/1, ST/H002480/1]
- Research Council of Norway
- Andoya Rocket Range
- COST action [ES0803]
- Air Force Office of Scientific Research
- Air Force Material Command, USAF [FA8655-10-1-3003]
- NERC [eiscat01001] Funding Source: UKRI
- STFC [ST/H002480/1, PP/E007929/1, PP/E000983/1] Funding Source: UKRI
- Natural Environment Research Council [eiscat01001] Funding Source: researchfish
- Science and Technology Facilities Council [PP/E000983/1, PP/E007929/1, ST/H002480/1] Funding Source: researchfish
The Investigation of Cusp Irregularities (ICI-2) sounding rocket was launched on 5 December 2008 from Ny-Alesund, Svalbard. The high-resolution rocket data are combined with data from an all-sky camera, the EISCAT Svalbard Radar, and the SuperDARN Hankasalmi radar. These data sets are used to characterize the spatial structure of F region irregularities in the dayside cusp region. We use the data set to test two key mechanisms for irregularity growth; the Kelvin-Helmholtz (KH) and gradient drift (GD) instabilities. Except for a promising interval of 4-6 km irregularities, the KH growth rate was found to be too slow to explain the observed plasma irregularities. The time history of the plasma gives further support that structured particle precipitation could be an important source of kilometer-to hectometer-scale seed irregularities, which are then efficiently broken down into decameter-scale irregularities by the GD mechanism.
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