Longitudinal Signatures in Global Electron Content Associated with Sudden Stratospheric Warming

Details Longitudinal Signatures in Global Electron Content Associated with Sudden Stratospheric Warming Longitudinal Signatures in Global Electron Content Associated with Sudden Stratospheric Warming

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1723c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1723

Physics

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics

Scientific paper

Studies of global total electron content (TEC) maps from the American longitude sector have shown clear evidence of dramatic changes in the electron density peaking a few days after sudden stratospheric warming (SSW) events. Analysis of the TEC reveals a strong 12-h signature post SSW. In the American longitudes, in the equatorial region, increases of 50-150% in the TEC during the morning sector and decreases of approximately 50% in the afternoon sector are observed. Disturbances in the TEC extend to the middle latitudes. One proposed mechanism for generating SSW is the enhancement of planetary waves prior to SSW. The question is what role do planetary waves have in producing the observed changes in the global TEC? Is there evidence of measurable change in the TEC prior to or during the SSW that can be associated with enhanced planetary wave activity? To address these questions, we have augmented our global TEC maps with TEC measurements derived from the COSMIC constellation's occultation data. The addition of COSMIC TEC allows for better global TEC coverage, especially over the oceans. This increased data coverage has made it easier to track changes in the TEC as a function of longitude. We report here on our study of the development of the enhancement of the semi-diurnal signature in the TEC data prior to, during, and after, the stratospheric warming events of 2008, 2009, and 2010.

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