Topside ionospheric electron temperature and density along the Weddell Sea latitude

It has been well known that the ionospheric electron density Ne is greater in the summer nighttime than daytime around the Weddell Sea region, which is named Weddell Sea Anomaly (WSA). This paper for the first time reports unusual increases (decreases) of the daytime (nighttime) electron temperature...

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Bibliographic Details
Published in:Journal of geophysical research. Space physics 2015-01, Vol.120 (1), p.609-614
Main Authors: Liu, J. Y., Chang, F. Y., Oyama, K. I., Kakinami, Y., Yeh, H. C., Yeh, T. L., Jiang, S. B., Parrot, M.
Format: Article
Language:English
Subjects:
Altitude
Anomalies
Astrophysics
Computation
Daytime
Density
Earthquakes
Electron density
Electron temperature
Electrons
Ionosphere
Latitude
Night
Plasma
Sciences of the Universe
Seismic activity
unusual electron temperature
Weddell Sea
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Summary:It has been well known that the ionospheric electron density Ne is greater in the summer nighttime than daytime around the Weddell Sea region, which is named Weddell Sea Anomaly (WSA). This paper for the first time reports unusual increases (decreases) of the daytime (nighttime) electron temperature Te at about 830 km altitude over the WSA latitudes probed by Tatiana‐2 during December 2009 to January 2010. Concurrent measurements at 660–830 km altitude observed by Tatiana‐2, Detection of Electro‐Magnetic Emissions Transmitted from Earthquake Regions (DEMETER), and Formosa Satellite 3/Constellation Observing System for Meteorology, Ionosphere and Climate (F3/C) reveal the anticorrelation between Te and Ne along the WSA latitudes in the daytime and nighttime. Based on F3/C Ne along the WSA latitudes observed at various local times, the associated Te values are computed. The Tatiana‐2 and DEMETER observations as well as the computed results show that Te yield the maximum values over the WSA region during daytime and over the Indian and Atlantic Ocean area during nighttime. The maxima or minima in F3/C Ne and the computed Te reveal eastward phase shifts. Key Points A new finding of electron temperature anomalies at Weddell Sea latitudes The eastward drift of reductions and/or enhancements in the electron density The electron temperature is inversely proportional to the electron density
ISSN:2169-9380
2169-9402
DOI:10.1002/2014JA020227