Spectral analysis of the midlatitude ion temperature responses to the sudden stratospheric warming events

Details Spectral analysis of the midlatitude ion temperature responses to the sudden stratospheric warming events Spectral analysis of the midlatitude ion temperature responses to the sudden stratospheric warming events

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1851g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1851

Physics

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

Scientific paper

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. This study focuses on the Sudden Stratospheric Warming (SSW) events that occurred in January 2008 and 2010, and presents the spectral analysis results performed on the ion temperatures measured by the Millstone Hill incoherent scatter radar (42.6°N, 288.5°E). These two periods occur in the last solar minimum which minimizes any influences of the solar activity variation in our analysis. Preliminary results show the dominance of the ~24.5 hour and 12 hour periodicities in the oscillations starting on Jan. 23 for 2008 and on Jan. 21 for 2010, and lasting for approximately 2 days. The domain of these two waves varies with altitude, i.e., the periodicities around ~12 hour are stronger for the low altitudes while periodicities around ~24 hour are stronger for high altitudes.

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