The Two-Dimensional Evolution of Thermospheric n-ary sumation O/N2Response to Weak Geomagnetic Activity During Solar-Minimum Observed by GOLD

被引：76

作者：

Cai, Xuguang ^{[1
]}

Burns, Alan G. ^{[1
]}

Wang, Wenbin ^{[1
]}

Qian, Liying ^{[1
]}

Solomon, Stanley C. ^{[1
]}

Eastes, Richard W. ^{[2
]}

Pedatella, Nicholas ^{[1
]}

Daniell, Robert E. ^{[3
]}

McClintock, William E. ^{[2
]}

机构：

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

[2] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA

[3] Ionospher Phys, Stoughton, MA USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 18期

基金：

美国国家科学基金会;

关键词：

O; N-2 column density ratio; thermosphere composition; weak geomagnetic activity; IONOSPHERIC STORMS; UPPER-ATMOSPHERE; PERTURBATIONS; MIDDLE;

D O I：

10.1029/2020GL088838

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We conduct observational and modeling studies of thermospheric composition responses to weak geomagnetic activity (nongeomagnetic storms). We found that the thermospheric O and N(2)column density ratio ( n-ary sumation O/N-2) in part of the Northern Hemisphere measured by Global-scale Observations of the Limb and Disk (GOLD) exhibited large and long-lived depletions during weak geomagnetic activity in May and June 2019. The depletions reached 30% of quiet time values, extended equatorward to 10 degrees N and lasted more than 10 hr. Furthermore, numerical simulation results are similar to these observations and indicate that the n-ary sumation O/N(2)depletions were pushed westward by zonal winds. The n-ary sumation O/N(2)evolution during weak geomagnetic activity suggests that the formation mechanism of the n-ary sumation O/N(2)depletions is similar to that during a geomagnetic storm. The effects of weak geomagnetic activity are often ignored but, in fact, are important for understanding thermosphere neutral composition variability and hence the state of the thermosphere-ionosphere system.

引用

页数：9

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