Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71.1176t&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 10-11, p. 1176-1189.
Physics
7
Solar Wind, Geomagnetic Storms, Energetic Precipitation, Nitric Oxide, Ozone
Scientific paper
Energetic particle precipitation couples the solar wind to the Earth's atmosphere and indirectly to Earth's climate. Ionisation and dissociation increases, due to particle precipitation, create odd nitrogen (NOx) and odd hydrogen (HOX) in the upper atmosphere, which can affect ozone chemistry. The long-lived NOx can be transported downwards into the stratosphere, particularly during the polar winter. Thus, the impact of NOx is determined by both the initial ionisation production, which is a function of the particle flux and energy spectrum, as well as transport rates. In this paper, we use the Sodankylä Ion and Neurtal Chemistry (SIC) model to simulate the production of NOx from examples of the most representative particle flux and energy spectra available today of solar proton events (SPE), auroral energy electrons, and relativistic electron precipitation (REP). Large SPEs are found to produce higher initial NOx concentrations than long-lived REP events, which themselves produce higher initial NOx levels than auroral electron precipitation. Only REP microburst events were found to be insignificant in terms of generating NOx. We show that the Global Ozone Monitoring by Occultation of Stars (GOMOS) observations from the Arctic winter 2003-2004 are consistent with NOx generation by a combination of SPE, auroral altitude precipitation, and long-lived REP events.
Clilverd Mark A.
Enell Carl-Fredrik
Rodger Craig J.
Seppälä Annika
Tamminen Johanna
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