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| Titel |
The evolution of atomic hydrogen between 2002 and 2008 |
| VerfasserIn |
M. Kaufmann, H. Schmidt, C. Lehmann, M. Ern, M. Riese |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063204
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| Zusammenfassung |
| The combination of satellite born SCIAMACHY hydroxyl and GOMOS ozone limb
measurements allows for the derivation of the global distribution of atomic hydrogen
abundance and instantaneous chemical heating rates in the mesopause region. Instantaneous
chemical heating rates show maximum values of 6–10Â K/day at 85–90Â km; atomic hydrogen
densities are 1–5-
108Â cm-3. A pronounced latitudinal structure with maxima at the equator
and at mid latitudes is observed. A pronounced semi-annual cycle is evident in the data,
pointing to the importance of atmospheric tides for the vertical distribution of constituent and
temperature data. The long term evolution of atomic hydrogen indicates an increase by 0–8%
between 2002 and 2008, which is in accordance with 11-year solar cycle model calculations. |
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