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GEOPHYSICAL RESEARCH LETTERS,
VOL. 32,
L03S11,
doi:10.1029/2004GL021521,
2005
Observations of mesospheric ozone depletion during the October 28, 2003 solar proton event by OSIRIS
D. A. Degenstein
Institute of Space and Atmospheric Studies, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon,
Saskatchewan, Canada
N. D. Lloyd
Institute of Space and Atmospheric Studies, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon,
Saskatchewan, Canada
A. E. Bourassa
Institute of Space and Atmospheric Studies, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon,
Saskatchewan, Canada
R. L. Gattinger
Institute of Space and Atmospheric Studies, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon,
Saskatchewan, Canada
E. J. Llewellyn
Institute of Space and Atmospheric Studies, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon,
Saskatchewan, Canada
Abstract
One of the largest solar proton events in the past thirty years took place on October 28, 2003 and had a significant impact
on the Earth's middle atmosphere. The incoming protons produce significant amounts of HOx constituents in the mesosphere and upper stratosphere that lead to ozone depletion. For 11 hours during the solar proton
event the OSIRIS instrument on Odin measured high spatial resolution profiles of the oxygen infrared atmospheric band at 1.26
microns which under sunlit conditions can be used as a direct proxy for ozone. Ozone depletion is observed across the southern
polar cap for the duration of the observations and extends to latitudes as far north as 45°S. OSIRIS observed significant
ozone depletion between 50 and 80 km with a maximum value of 75% around 65 km. The actual maximum depletion could have been
even greater as observations ceased while the depletion was still increasing.
Received 15
September
2004;
accepted 5
November
2004;
published 13
January
2005.
Index Terms: 0310 Atmospheric Composition and Structure: Airglow and aurora; 0340 Atmospheric Composition and Structure: Middle atmosphere: composition and chemistry; 0342 Atmospheric Composition and Structure: Middle atmosphere: energy deposition (3334).
Subscriber Access to Full Article (Nonsubscribers may purchase for $9.00, Includes print PDF, file size: 1320305 bytes)
Citation: Degenstein, D. A., N. D. Lloyd, A. E. Bourassa, R. L. Gattinger, and E. J. Llewellyn
(2005),
Observations of mesospheric ozone depletion during the October 28, 2003 solar proton event by OSIRIS,
Geophys. Res. Lett.,
32,
L03S11,
doi:10.1029/2004GL021521.
Copyright 2005 by the American Geophysical Union.
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