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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The German Swarm Project Office Ritter Patricia , Luehr Hermann Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany In order to provide the best ever survey of the geomagnetic field and its temporal evolution ESA is planning a constellation mission of three satellites. The Swarm mission, as one of the Earth Explorer Missions within the Living Planet Programme, will provide new insights into the processes that generate the various parts of the magnetic field in and near the Earth. The satellites will monitor with high resolution the scalar and vector magnetic field, the electric field, plasma density, electron /ion temperature, air density and thermospheric winds. These observations, and the derivation of field models, play also an important role in predicting space weather activity within the near-Earth environment. The German Swarm Project Office was initiated to distribute information about this mission and its wide application spectrum. It acts as an interface of the German Aerospace Center (DLR) to ESA and the main contractor EADS Astrium (Friedrichshafen) . The Project Office will coordinate the scientific and technical use of the expected results at German companies and research institutions as part of a comprehensive concept for Swarm data exploitation. The home page of the Swarm Project Office is www.swarm-projektbuero.de. The Swarm Project Office at GFZ is sponsored by the Federal Republic of Germany, Initiator: German Space Agency of the German Aerospace Center (DLR) through funds of the German Federal Ministry of Economics and Technology based on a decision of the German Federal Parliament (FKZ 50EE0916).
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Ground-based estimates of outer radiation belt energetic electron precipitation fluxes into the atmosphere Rodger Craig 1 , Clilverd Mark 2 , Gamble Rory 1 , Ulich Thomas 3 , Raita Tero 3 , Seppälä Annika 2 , Green Janet 4 , Thomson Neil 1 , Sauvaud Jean-André 5 , Parrot Michel 6 1 University of Otago, 2 British Antarctic Survey (NERC), 3 Sodankylä Geophysical Observatory (University of Oulu), 4 Space Weather Prediction Center (NOAA), 5 Centre d'Etude Spatiale des Rayonnements, 6 Laboratoire de Physique et Chimie de l'Environnement Currently there is intense debate as to the ultimate effects of solar activity on tropospheric and stratospheric variability, particularly through direct and indirect effects of chemical changes induced by energetic particle precipitation. However, there are key unresolved questions concerning the understanding of the effects of energetic particle precipitation on the lower atmosphere, one of which is magnitude and temporal variability of precipitating radiation belt energetic electrons. Definitive answers are very difficult to provide from satellite measurements alone because of the complexity in measuring electron fluxes unambiguously in the whole bounce-loss cone without contamination from fluxes in the drift-loss cone or trapped fluxes. In this study we have used AARDDVARK data from a radiowave receiver in Sodankylä, Finland to monitor transmissions from the very low frequency communications transmitter, NAA, (24.0 kHz, 44°N, 67°W, L=2.9) in USA since 2004. The transmissions are influenced by outer radiation belt (L=3-7) energetic electron precipitation. In this study we have been able to show that the observed transmission amplitude variations can be used to routinely determine the flux of energetic electrons entering the atmosphere. Our analysis of the NAA observations shows that electron precipitation fluxes can vary by three orders of magnitude during geomagnetic storms. Comparison of the ground-based estimates of precipitation flux with satellite observations from DEMETER and POES indicates a broad agreement during geomagnetic storms, but some differences in the quiet-time levels, with the satellites observing higher fluxes than those observed from the ground. Typically when averaging over L=3-7 we find that the >100 keV POES ‘trapped’ fluxes peak at about 10 6 el.cm -2 s -1 str -1 during geomagnetic storms, with the DEMETER >100 keV drift loss cone showing peak fluxes of 10 5 el.cm -2 s -1 str -1 , and both the POES >100 keV ‘loss’ fluxes and the NAA groundbased >100 keV precipitation fluxes showing peaks of ~10 4 el.cm -2 s -1 str -1 . The analysis of NAA amplitude variability has the potential of providing a detailed, near real-time, picture of energetic electron precipitation fluxes from the outer radiation belts.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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