C/NOFS observations of deep plasma depletions at dawn

被引：76

作者：

de La Beaujardiere, Odile ^{[1
]}

Retterer, John M. ^{[1
]}

Pfaff, Robert F. ^{[3
]}

Roddy, Patrick A. ^{[1
]}

Roth, Christopher ^{[4
]}

Burke, William J. ^{[1
]}

Su, Yi Jiun ^{[1
]}

Kelley, Michael C. ^{[2
]}

Ilma, Ronald R. ^{[2
]}

Wilson, Gordon R. ^{[1
]}

Gentile, Louise C. ^{[1
]}

Hunton, Donald E. ^{[1
]}

Cooke, David L. ^{[1
]}

机构：

[1] USAF, Space Vehicles Directorate, Res Lab, Hanscom AFB, MA 01731 USA

[2] Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY 14853 USA

[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[4] Atmospher & Environm Res Inc, Lexington, MA 02421 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷

基金：

美国国家航空航天局;

关键词：

IONOSPHERE; SATELLITE; SUNRISE;

D O I：

10.1029/2009GL038884

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Communication/Navigation Outage Forecasting System (C/NOFS) satellite was launched in 2008, during solar minimum conditions. An unexpected feature in the C/NOFS plasma density data is the presence of deep plasma depletions observed at sunrise at all satellite altitudes. Ionospheric irregularities are often embedded within these dawn depletions. Their frequencies strongly depend on longitude and season. Dawn depletions are also observed in coincident satellite passes such as DMSP and CHAMP. In one example the depletion extended 50 degrees x 14 degrees in the N-S and E-W directions, respectively. These depletions are caused by upward plasma drifts observed in C/NOFS and ground-based measurements. The reason for these upward drifts is still unresolved. We discuss the roles of dynamo electric fields, over-shielding, and tidal effects as sources for the reported depletions. Citation: de La Beaujardiere, O., et al. (2009), C/NOFS observations of deep plasma depletions at dawn, Geophys. Res. Lett., 36, L00C06, doi: 10.1029/2009GL038884.

引用

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