TY - JOUR
T1 - First Global-Scale Synoptic Imaging of Solar Eclipse Effects in the Thermosphere
AU - Aryal, Saurav
AU - Evans, J. S.
AU - Correira, John
AU - Burns, Alan G.
AU - Wang, Wenbin
AU - Solomon, Stanley C.
AU - Laskar, Fazlul I.
AU - McClintock, William E.
AU - Eastes, Richard W.
AU - Dang, Tong
AU - Lei, Jiuhou
AU - Liu, Huixin
AU - Jee, Geonhwa
N1 - Funding Information:
The authors thank the GOLD instrument team for setting up the special observation mode for eclipse. This involved a preeclipse dry run and the baseline run on 30 June 2019. In addition, we would also like to thank all the people directly and indirectly involved in the GOLD mission. This research is supported by NASA Contract 80GSFC18C0061 to the University of Colorado. H. Liu acknowledges support from JSPS KAKENHI Grants 18H01270, 18H04446, and 17KK0095, and JSPS-DFG bilateral project JRPs-LEAD with DFG. Geonhwa Jee acknowledges support from the KOPRI Grant PE20100. The National Center for Atmospheric Research is sponsored by the National Science Foundation.
Funding Information:
The authors thank the GOLD instrument team for setting up the special observation mode for eclipse. This involved a preeclipse dry run and the baseline run on 30 June 2019. In addition, we would also like to thank all the people directly and indirectly involved in the GOLD mission. This research is supported by NASA Contract 80GSFC18C0061 to the University of Colorado. H. Liu acknowledges support from JSPS KAKENHI Grants 18H01270, 18H04446, and 17KK0095, and JSPS‐DFG bilateral project JRPs‐LEAD with DFG. Geonhwa Jee acknowledges support from the KOPRI Grant PE20100. The National Center for Atmospheric Research is sponsored by the National Science Foundation.
Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.
PY - 2020/9/1
Y1 - 2020/9/1
N2 - A total solar eclipse occurred in the Southern Hemisphere on 2 July 2019 from approximately 17 to 22 UT. Its effect in the thermosphere over South America was imaged from geostationary orbit by NASA's Global-scale Observation of Limb and Disk (GOLD) instrument. GOLD observed a large brightness reduction (>80% around totality) in OI 135.6 nm and N2 LBH band emissions compared to baseline measurements made 2 days prior. In addition, a significant enhancement (with respect to the baseline) in the ΣO/N2 column density ratio (~80%) was observed within the eclipse's totality. This enhancement suggests that the eclipse induced compositional changes in the thermosphere. After the eclipse passed, a slight enhancement in ΣO/N2 column density ratio (~7%) was also seen around the totality path when compared to measurements before the eclipse. These observations are the first synoptic imaging measurements of an eclipse's thermospheric effects with the potential to drastically improve and test our understanding of how the thermosphere responds to rapid, localized changes in solar short wavelength radiation.
AB - A total solar eclipse occurred in the Southern Hemisphere on 2 July 2019 from approximately 17 to 22 UT. Its effect in the thermosphere over South America was imaged from geostationary orbit by NASA's Global-scale Observation of Limb and Disk (GOLD) instrument. GOLD observed a large brightness reduction (>80% around totality) in OI 135.6 nm and N2 LBH band emissions compared to baseline measurements made 2 days prior. In addition, a significant enhancement (with respect to the baseline) in the ΣO/N2 column density ratio (~80%) was observed within the eclipse's totality. This enhancement suggests that the eclipse induced compositional changes in the thermosphere. After the eclipse passed, a slight enhancement in ΣO/N2 column density ratio (~7%) was also seen around the totality path when compared to measurements before the eclipse. These observations are the first synoptic imaging measurements of an eclipse's thermospheric effects with the potential to drastically improve and test our understanding of how the thermosphere responds to rapid, localized changes in solar short wavelength radiation.
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U2 - 10.1029/2020JA027789
DO - 10.1029/2020JA027789
M3 - Article
AN - SCOPUS:85092554713
SN - 2169-9380
VL - 125
JO - Journal of Geophysical Research: Space Physics
JF - Journal of Geophysical Research: Space Physics
IS - 9
M1 - e2020JA027789
ER -