Stuttgart 2012 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 2: International Space Weather Initiative
EP 2.2: Vortrag
Dienstag, 13. März 2012, 11:00–11:15, V55.02
Altitude-dependent production and lifetime of NOx during the SPE in October/November 2003 at 44-62 km — •Felix Friederich1, Thomas von Clarmann1, Bernd Funke2, Holger Nieder1, Johannes Orphal1, Miriam Sinnhuber1, Gabriele Stiller1, and Jan M. Wissing3 — 1Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, 76344 Eggenstein-Leopoldshafen, Germany — 2Instituto de Astrofisica de Andalucia, CSIC, 18008 Granada, Spain — 3FB Physik, University of Osnabrück, 49076 Osnabrück, Germany
During a solar proton event (SPE) electrons, protons, and more massive ions from the sun intrude in polar latitudes of the Earth’s atmosphere and lead to excitation, ionization, and dissociation. The particles can penetrate in the upper stratosphere (∼ 40 km) and thus directly affect regions down to this altitude. As a result, NOx (NO and NO2) is produced through dissociation of N2 and subsequent ion-chemical reactions. In October/November 2003 a strong SPE occured, which enhanced NOx many times over its background volume mixing ratio. Since NOx is one of the most important species for catalytic ozone destruction in the mid-stratosphere, and stratospheric ozone is known to affect tropospheric weather systems, SPEs play an important role in Sun-Earth connection, and potentially even for the climate system.
Measurements of NO and NO2 by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on ENVISAT are used to determine the atmospheric content of NOx at altitudes of 44-62 km.