4.7 Article

The Dependence of Cold and Hot Patches on Local Plasma Transport and Particle Precipitation in Northern Hemisphere Winter

期刊

GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 12, 页码 -

出版社

AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL098671

关键词

ionosphere; polar cap patch; plasma transport; particle precipitation

资金

  1. National Natural Science Foundation of China [42120104003, 41874170, 41831072]
  2. Stable-Support Scientific Project of China Research Institute of Radiowave Propagation [A132101W02]
  3. Chinese Meridian Project
  4. China Postdoctoral Science Foundation [2021M701974]
  5. Research Council of Norway [223252]

向作者/读者索取更多资源

This study analyzes the distribution of cold patches and hot patches using satellite data and investigates their dependence on local plasma transport and soft-electron precipitation. The results show that cold and hot patches have different distribution patterns under different interplanetary magnetic field orientations and ionospheric convection geometries.
By using a database of 4,634 cold patches (high density and low electron temperature) and 4,700 hot patches (high density and high electron temperature) from Defense Meteorological Satellite Program F16 in 2005-2018 winter months (October-March), we present a statistical survey of the distributions of polar cap patches for different interplanetary magnetic field (IMF) orientations and ionospheric convection geometries. We investigate the dependence of cold and hot patches on local plasma transport and soft-electron precipitation. Our results indicate that: in winter, (a) more cold and hot patches occur in the stronger anti-sunward flow organized by different IMF orientations. (b) cold patches are frequent near the central polar cap, while hot patches are closer to the auroral oval. (c) enhanced anti-sunward flow (E x B drift) mainly contributes to cold patch occurrence under Bz < 0, and soft-electron precipitation contributes to hot patch occurrence both under southward and northward IMF.

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