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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Why are relativistic electrons persistently quiet at geosynchronous orbit in 2009? Kataoka Ryuho 1 , Miyoshi Yoshizumi 2 1 Tokyo Tech, 2 STEL, Nagoya University Relativistic electrons at geosynchronous orbit (GEO) were persistently quiet in 2009 for almost a whole year. The solar wind speed, which has been known as a primary parameter controlling the outer belt electrons, was very slow in 2009 as expected, and at a comparably low level as of 1997 when we did not observe such a persistently quiet condition. Since the interplanetary magnetic field (IMF) was quite different between 1997 and 2009, the difference in IMF is a possible cause of the difference in the electron flux levels, providing an important clue to understand the complex source and loss process of relativistic electrons at GEO. We suggest that the extremely weak IMF of the very slow solar wind plays an essential role in diminishing the source processes themselves such as magnetic storms and substorms, and in turn to suppress the relativistic electron flux at GEO over the time scale of a year, as an inevitable consequence of extremely weak open magnetic field of the Sun associated with the extremely weak current solar minimum.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar cycle 23 in SCIAMACHY Atomic Oxygen and Hydrogen Data Kaufmann Martin 1 , Schmidt Hauke 2 , Lehmann Catrin 1 , Riese Martin 1 1 2 Forschungszentrum Jülich, ICG, Jülich, Germany, Max Planck Institut für Meteorologie, Hamburg, Germany Several mesospheric species such as atomic hydrogen, oxygen and ozone as measured by Sciamachy and Gomos on Envisat show a pronounced dependence on the solar flux during the 23rd solar cycle. This dependence is analysed and compared to model simulations of the HAMburg Model of the Neutral and Ionized Atmosphere. Differences are discussed with respect to dynamical and photochemical effects.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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