High Latitude Ion Temperature Responses in the Lower and Upper Thermosphere During Sudden Stratospheric Warming Events

Details High Latitude Ion Temperature Responses in the Lower and Upper Thermosphere During Sudden Stratospheric Warming Events High Latitude Ion Temperature Responses in the Lower and Upper Thermosphere During Sudden Stratospheric Warming Events

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1838m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1838

Physics

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2467] Ionosphere / Plasma Temperature And Density

Scientific paper

We analyzed ion temperature responses in the lower and upper thermosphere to sudden stratospheric warmings (SSWs) that occurred in January 2008 and January 2009. Ion temperatures were obtained with the Sondrestrom Incoherent Scatter Radar (67N, 51W). The SSW of January 2008 was a vortex displacement event, with Sondrestrom ISR probing the ionosphere above a cold cell in the stratosphere during the peak of the warming event. The SSW of January 2009 was a vortex split event, and the radar obtained measurements above the hot cell in the stratosphere. Despite differing local stratospheric conditions, signatures of cooling in the evening hours at 150-300km were found during the peaks of both events. To differentiate ion temperature variations caused by the SSW from variations caused by geomagnetic activity, ion temperatures from geomagnetically quiet dates from several weeks before the events were used as baselines. The Sondrestrom local ionospheric model was used to examine expected ion temperature responses to seasonal variations and geomagnetic activity. The magnitude of cooling observed during both events exceeded the variations predicted by the model. Ion temperatures observed in the evening hours of the January 2008 event at 150-300km were considerably cooler than baseline ion temperatures despite increased geomagnetic activity during the event. During daytime hours of the events, ion temperatures varied slightly from the baselines; some stronger daytime variations were observed, but no strong conclusions could be made due to fluctuations caused by geomagnetic activity.

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