Mid-latitude Ion Temperature during a Sudden Stratospheric Warming Event

Details Mid-latitude Ion Temperature during a Sudden Stratospheric Warming Event Mid-latitude Ion Temperature during a Sudden Stratospheric Warming Event

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1721h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1721

Mathematics

Logic

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics, [2443] Ionosphere / Midlatitude Ionosphere, [2487] Ionosphere / Wave Propagation

Scientific paper

Ionospheric variability impacts a variety of communication and navigation systems. Although the primary drivers of ionospheric variability, such as solar ionizing flux and geomagnetic activity, are relatively well understood, the effects of the lower atmosphere onto the ionosphere remain elusive. Due to the current deep solar minimum and the meteorological phenomena known as sudden stratospheric warming (SSW), new studies have shown promising results that shed light on the coupling of the ionosphere to processes from below. This study focuses on the SSW event that occurred in January 2010, and presents the results obtained from the Millstone Hill incoherent scatter radar (42.6°N, 288.5°E). We analyze observed variations in ion temperature in the altitude range 100-400 km. Regions of warming and cooling above 200 km were observed by the radar during the daytime hours (6-18LT). A 10-25K decrease in temperature was observed in the morning hours (6-10LT), and areas of warming in the range of 15-30K were observed in the afternoon hours. We conclude that solar flux and geomagnetic activity cannot account for the observed warming and cooling at F-region altitudes in the daytime, and suggest that this temperature variation is associated with stratospheric warming. After the sunset and during the nighttime, we report a ~30K increase in ion temperature, which could not be related to the increase in geomagnetic activity. We discuss to what degree it can be associated with tidal phenomena, and how it changes during the stratospheric warming event. Examining the January 2010 SSW event will provide more insight into the interactions between the lower and upper atmosphere, and recognizing their connection is essential in understanding and forecasting the geospace environment.

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