期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 121, 期 6, 页码 5639-5652出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015JA022221
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资金
- national scientific funding agency of Australia
- national scientific funding agency of Canada
- national scientific funding agency of China
- national scientific funding agency of France
- national scientific funding agency of Japan
- national scientific funding agency of South Africa
- national scientific funding agency of United Kingdom
- national scientific funding agency of United States of America
- Japan Society for the Promotion of Science (JSPS) [22340143, 26302006]
- Grants-in-Aid for Scientific Research [26302006] Funding Source: KAKEN
On 24 November 2012, an interval of polar cap patches was identified by an all-sky airglow imager located near the dayside cusp. During the interval, the successive appearance of poleward moving auroral forms (PMAFs) was detected, which are known to represent ionospheric manifestations of pulsed magnetic reconnections at the dayside magnetopause. All of the patches observed during the interval appeared from these transient auroral features (i.e., there was a one-to-one correspondence between PMAFs and newly created baby patches). This fact strongly suggests that patches can be directly and seamlessly created from a series of PMAFs. The optical intensities of the baby patches were 100-150 R, which is slightly lower than typical patch luminosity on the nightside and may imply that PMAF-induced patches are generally low density. The generation of such patches could be explained by impact ionization due to soft particle precipitation into PMAFs traces. In spite of the faint signature of the baby patches, two coherent HF radars of the SuperDARN network observed backscatter echoes in the central polar cap, which represented signatures of plasma irregularities associated with the baby patches. These indicate that patches created from PMAFs have the potential to affect the satellite communications environment in the central polar cap region.
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