The winter anomaly in the middle-latitude F region during the solar minimum period observed by the Constellation Observing System for Meteorology, Ionosphere, and Climate

Details The winter anomaly in the middle-latitude F region during the solar minimum period observed by the Constellation Observing System for Meteorology, Ionosphere, and Climate The winter anomaly in the middle-latitude F region during the solar minimum period observed by the Constellation Observing System for Meteorology, Ionosphere, and Climate

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11602302l&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A2, CiteID A02302

Physics

1

Ionosphere: Midlatitude Ionosphere, Ionosphere: Topside Ionosphere, Ionosphere: General Or Miscellaneous, Ionosphere: Ionosphere/Atmosphere Interactions (0335)

Scientific paper

The winter anomaly (or seasonal anomaly) at middle latitudes is a phenomenon during which the daytime plasma density at the F-peak height (NmF2) is greater in winter than in summer. Radio occultation measurements from the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) satellites provide a new data source for study of the winter anomaly on a global scale. In this study we investigate the altitude, local time, latitude, longitude, and hemispheric variations of the electron density in the middle-latitude ionosphere by analyzing the COSMIC data measured in 2007 during a magnetically quiet period (Kp ≤ 3). The seasonal mean behavior of the NmF2 obtained from COSMIC data shows the occurrence of the winter anomaly feature during 0800-1600 LT in the Northern Hemisphere but not in the Southern Hemisphere. The intensity of the winter anomaly is variable with longitude, and a more intense winter anomaly is likely to occur at longitudes closer to the magnetic pole. At northern middle latitudes, a greater electron density in the winter than in the summer occurs in the narrow altitude range near the F-peak height. Except for the winter anomaly feature at northern middle latitudes, the electron density at middle latitudes is greater during the summer than during the winter in both hemispheres.

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