The Ion/Electron Temperature Characteristics of Polar Cap Classical and Hot Patches and Their Influence on Ion Upflow

The term of “polar cap hot patch” is a newly identified high‐density plasma irregularity at high latitudes, which is associated with high electron temperature and particle precipitation, while a classical polar cap patch has lower electron temperature. To investigate characteristics of hot patches v...

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Veröffentlicht in:	Geophysical research letters 2018-08, Vol.45 (16), p.8072-8080
Hauptverfasser:	Ma, Yu‐Zhang, Zhang, Qing‐He, Xing, Zan‐Yang, Heelis, Roderick A., Oksavik, Kjellmar, Wang, Yong
Format:	Artikel
Sprache:	eng
Schlagworte:	Communication Convection Coupling Density gradients DMSP satellites Earth Electron energy electron temperature Fluctuations Identification Ion flux ion temperature ion upflow Ionosphere Magnetosphere Magnetosphere-ionosphere coupling Magnetospheres Magnetospheric-solar wind relationships Momentum M‐I coupling Navigation Particle precipitation Patches (structures) Plasma polar cap patches Polar caps Polar ionosphere Radio signals Remote sensing Satellite navigation Satellite observation Satellites Solar wind Spaceborne remote sensing Temperature differences Temperature effects Temperature gradients Temperature ratio Upper atmosphere
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Zusammenfassung:	The term of “polar cap hot patch” is a newly identified high‐density plasma irregularity at high latitudes, which is associated with high electron temperature and particle precipitation, while a classical polar cap patch has lower electron temperature. To investigate characteristics of hot patches versus classical patches, five years of in situ database of plasma observations from the DMSP satellites was analyzed. For the first time, we show how the ion/electron temperature ratio (or temperature difference) can be used to distinguish between classical and hot patches. For classical patches (Ti/Te > 0.8 or Te
ISSN:	0094-8276 1944-8007
DOI:	10.1029/2018GL079099