Observation of Postsunset OI 135.6 nm Radiance Enhancement Over South America by the GOLD Mission

被引:32
作者
Cai, Xuguang [1 ]
Burns, Alan G. [1 ]
Wang, Wenbin [1 ]
Qian, Liying [1 ]
Liu, Jing [1 ]
Solomon, Stanley C. [1 ]
Eastes, Richard W. [2 ]
Daniell, Robert E. [3 ]
Martinis, Carlos R. [4 ]
McClintock, William E. [2 ]
Batista, Inez S. [5 ]
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 Consulting, Stoughton, MA USA
[4] Boston Univ, Ctr Space Phys, Boston, MA 02215 USA
[5] Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, Brazil
基金
美国国家科学基金会;
关键词
asymmetry; equatorial ionization anomaly; GOLD; postsunet enhancement; TOTAL ELECTRON-CONTENT; GLOBAL-SCALE OBSERVATIONS; NIGHTTIME ENHANCEMENTS; LOW LATITUDES; INTERHEMISPHERIC ASYMMETRY; POSTMIDNIGHT ENHANCEMENT; DENSITY; SOLAR; MORPHOLOGY; REGION;
D O I
10.1029/2020JA028108
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Global-scale Observation of Limb and Disk (GOLD) mission, for the first time, provides synoptic two-dimensional (2D) maps of OI 135.6 nm observations. These maps describe the unambiguous and dynamic evolution of nighttime ionospheric F-2-peak electron densities (NmF2) as the 135.6 nm airglow emission radiance correlates well with NmF2 at night. On November 19, 2018, the 135.6 nm radiance measured by GOLD, NmF2 measured by a digisonde, and GPS total electron content (TEC) measurements at Cachoeira Paulista (CP) all showed a postsunset enhancement, with an increase near 22:30 universal time. The 135.6 nm radiance map showed that this enhancement was due to the southward movement of the southern equatorial ionization anomaly (EIA) crest. Therefore, the GOLD observation showed the linkage between postsunset enhancement of NmF2 and EIA movement. Furthermore, unlike the southward movement of the southern crest, the corresponding EIA northern crest, however, did not show northward motion. This is the first time that the EIA hemispheric asymmetry, which included both different densities and movement of two crests in a short time period (<2-h), was captured. The cause of this asymmetric movement of the two crests is not clear and requires further investigation.
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页数:18
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