scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 On the Importance of the Local Interstellar Spectrum for the Solar Modulation Parameter Herbst Klaudia 1 , Kopp Andreas 1 , Heber Bernd 1 , Steinhilber Friedhelm 2 , Fichtner Horst 3 , Scherer Klaus 3 , Matthiä Daniel 4 1 Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany, 2 Swiss Federal Institute of Aquatic Science and Technology, Eawag, 8600 Dübendorf, Switzerland, 3 Theoretische Physik IV, Ruhr-Universität Bochum, Germany, 4 Institut für Luft- und Raumfahrtmedizin, Deutsches Zentrum für Luft- und Raumfahrt, Köln, Germany Here we compare several local interstellar proton spectra often used in literature, and show that the modulation parameter $\phi$, which parametrizes the modulation of the local interstellar spectrum (LIS) in the heliosphere, strongly depends on the LIS itself. Taking the LIS dependency of $\phi$ into account, we first derive linear equations to convert the modulation parameter between the different LIS and afterwards apply these conversions to a long-term reconstruction of $\phi$ from a derived cosmogenic nuclide 10 Be record. For some LIS models occasionally negative values are obtained, a fact which is impossible from the physical point of view. Despite inner-heliospheric effects such as uncertainties in the geomagnetic field and climate influences on the 10 Be production, one possible reason may also be the choice of the LIS. We show that the reconstruction of $\phi$ provides the potential to derive the lower intensity limit of the LIS, keeping in mind that first the inner-heliospheric effects have to be removed from the data.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 QBO influences on the polar mesosphere and lower-thermosphere Hibbins Robert 1 , Jarvis Martin 1 , Ford Elaina 1 , Marsh Oliver 1 , McDonald Adrian 2 1 British Antarctic Survey, UK, 2 University of Canterbury, New Zealand Long-term ground-based radar observations have been used to investigate the influence of the equatorial stratospheric quasi-biennial oscillation on the dynamics of the polar mesosphere and lower thermosphere. When the variance in the 12-30 day band-passed horizontal wind is used as a proxy for long-period planetary wave activity, it is found that during winter (summer) planetary wave activity is enhanced (reduced) in the Antarctic MLT when the QBO around 40 hPa is positive. Furthermore, when a QBO-driven enhancement in planetary wave activity is observed in the high latitude southern hemisphere, a corresponding reduction is observed in the opposite hemisphere. The QBO is also shown to influence the zonal wind in the Antarctic MLT, especially around the time of the polar vortex break up, and to modulate the Antarctic semidiurnal tide through changes in the amplitude of the S=1 non-migrating component.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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