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

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...

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Bibliographic Details
Published in:Geophysical research letters 2022-06, Vol.49 (12), p.n/a
Main Authors: Zhang, Duan, Zhang, Qing‐He, Ma, Y.‐Z., Oksavik, Kjellmar, Lyons, L. R., Xing, Zan‐Yang, Hairston, Marc, Deng, Z.‐X., Liu, J.‐J.
Format: Article
Language:English
Subjects:
Auroral oval
Cold
Convection
Defense programs
Density
DMSP satellites
Electron energy
Electron precipitation
Flow velocity
Interplanetary magnetic field
Ionosphere
Ionospheric convection
Magnetic field
Magnetic fields
Meteorological satellite program
Meteorological satellites
Northern Hemisphere
Particle precipitation
Patches (structures)
plasma transport
polar cap patch
Polar caps
Polar ionosphere
Precipitation
Satellite observation
Satellites
Surveying
Temperature
Transport
Winter
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Summary: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 × B drift) mainly contributes to cold patch occurrence under Bz 
ISSN:0094-8276
1944-8007
DOI:10.1029/2022GL098671