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| Titel |
Possible effect of extreme solar energetic particle events of September–October 1989 on polar stratospheric aerosols: a case study |
| VerfasserIn |
I. A. Mironova, I. G. Usoskin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 17 ; Nr. 13, no. 17 (2013-09-02), S.8543-8550 |
| Datensatznummer |
250085657
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| Publikation (Nr.) |
 copernicus.org/acp-13-8543-2013.pdf |
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| Zusammenfassung |
| The main ionization source of the middle and low Earth's atmosphere is related
to energetic particles coming from outer space. Usually it is ionization from
cosmic rays that is always present in the atmosphere. But in a case of a very
strong solar eruption, some solar energetic particles (SEPs) can reach
middle/low atmosphere increasing the ionization rate up to some orders of
magnitude at polar latitudes. We continue investigating such a special class
of solar events and their possible applications for natural variations of the
aerosol content. After the case study of the extreme SEP event of
January 2005 and its possible effect upon polar stratospheric aerosols, here
we analyze atmospheric applications of the sequence of several events
that took place over autumn 1989. Using aerosol data obtained over polar
regions from two satellites with space-borne optical instruments SAGE II and
SAM II that were operating during September–October 1989, we found that an
extreme major SEP event might have led to formation of new particles and/or
growth of preexisting ultrafine particles in the polar stratospheric region.
However, the effect of the additional ambient air ionization on the aerosol
formation is minor, in comparison with temperature effect, and can take place
only in the cold polar atmospheric conditions. The extra aerosol mass
formed under the temperature effect allows attributing most of the changes
to the "ion–aerosol clear sky mechanism". |
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