Global Modeling of Equatorial Spread F with SAMI3/WACCM-X

被引：64

作者：

Huba, J. D. ^{[1
]}

Liu, H-L ^{[2
]}

机构：

[1] Syntek Technol, Fairfax, VA 22031 USA

[2] Natl Ctr Atmospher Res, High Altitude Observ, Pob 3000, Boulder, CO 80307 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 14期

基金：

美国国家科学基金会;

关键词：

equatorial ionophere; spread F; equatorial irregularities; ionosphere thermosphere coupling; IRREGULARITIES; IONOSPHERE;

D O I：

10.1029/2020GL088258

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report the first results of a global ionosphere/thermosphere simulation study that self-consistently generates large-scale equatorial spreadF(ESF) plasma bubbles in the postsunset ionosphere. The coupled model comprises the ionospheric code SAMI3 and the atmosphere/thermosphere code WACCM-X. Two cases are modeled for different seasons and geophysical conditions: the March case (low solar activity: F10.7 = 70) and the July case (high solar activity: F10.7 = 170). We find that equatorial plasma bubbles formed and penetrated into the topsideFlayer for the March case but not the July case. For the March case, a series of bubbles formed in the Atlantic sector with irregularity spacings in the range 400-1,200 km, rose to over 800 km, and persisted until after midnight. These results are consistent with recent GOLD observations. Calculation of the generalized Rayleigh-Taylor instability (GRTI) growth rate shows that the e-folding time was shorter for the March case than the July case.

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页数：9

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