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EP: Fachverband Extraterrestrische Physik

EP 7: Poster Session Extraterrestrics

EP 7.5: Poster

Dienstag, 31. März 2009, 17:30–19:00, Foyer der Zahnklinik

On the Possibility of Upper Mesosphere Temperature Changes Observed in PMSE and Incoherent Scatter During a Strong Polar Cap Absorption Event - Revisited - — •Jürgen Röttger — EISCAT-CAWSES-Copernicus and Max-Planck-Institute, 37191 Katlenburg-Lindau, Germany

Middle of July 2000 an extremly strong solar proton event happened (named ``Bastille II"), which caused major polar cap absorption (PCA) due to the strong increase of D-region electron density by high energy particle precipitation. The concurrent ionospheric disturbances led to enhanced electric fields, which caused an increase of the ion drift and the neutral wind in the lower thermosphere and possibly the upper mesosphere as well. Through the enhanced ion drag, increases of ion and neutral temperature are usually resulting, which are also known as Joule heating. It is revisted here how it was tried to recognize this in coherent scatter observations of PMSE with the SOUSY Svalbard Radar (SSR on 53.5 MHz) and observations of incoherent scatter with the EISCAT Svalbard Radar (ESR on 500 MHz). We find two independent observations, which indicate a potential small temperature increase of the upper mesopause region, which can be due to ion heating.