Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33c..03v&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA33C-03
Other
0305 Aerosols And Particles (0345, 4801, 4906), 0340 Middle Atmosphere: Composition And Chemistry, 0342 Middle Atmosphere: Energy Deposition (3334), 3360 Remote Sensing
Scientific paper
In this contribution we report on the effects of solar proton events (SPEs) on the occurrence and properties of noctilucent clouds (NLCs) or Polar Mesospheric Clouds (PMCs). Satellite observations of NLC properties made with the SCIAMACHY/Envisat, OSIRIS/Odin and SBUV instruments were used to investigate changes in NLC during the January 16 -- 22, 2005 SPE. The observations showed a severe depletion in NLCs during the SPE with occurrence rates decreasing from about 80% to less than 20% for the 70°S to 80°S latitude range. Simultaneous temperature measurements with MLS/Aura showed an increase of > 10 K in zonally averaged temperatures at 85 km altitude within the period of enhanced ionization, which is likely the direct cause for the disappearance of NLCs. Different possible mechanisms leading to the temperature increase will be discussed, but the exact mechanism is not yet fully understood. We will also present first results of an investigation to identify further examples for NLC depletion during SPEs using the SBUV NLC data set. The impact of SPEs on NLCs is relevant for evaluating the role of NLCs as early indicators of climate change, because it may be another important process that has a significant effect on NLCs.
Bovensmann Heinrich
Burrows John P.
DeLand Matthew T.
Lambert Amaury
Llewellyn Edam J.
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