North-south asymmetries of solar particle events in upper stratospheric ozone

Details North-south asymmetries of solar particle events in upper stratospheric ozone North-south asymmetries of solar particle events in upper stratospheric ozone

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..857m&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, July 1984, p. 857-870.

Computer Science

4

Atmospheric Composition, Northern Hemisphere, Ozonometry, Solar Corpuscular Radiation, Solar Terrestrial Interactions, Southern Hemisphere, Annual Variations, Atmospheric Chemistry, Geomagnetism, Nimbus 4 Satellite, Spatial Distribution, Stratosphere

Scientific paper

Stratospheric ozone depressions, following intense solar particle events (SPE) observed by the backscattered ultraviolet (BUV) experiment on the Nimbus-4 satellite, indicate the existence of distinct asymmetries between the Northern and Southern Hemispheres. These asymmetries are observed in the magnitude of the depressions above the 5-mb level, their temporal variations, and the spatial (i.e., latitude and longitude) dependence of these variations. Possible causes of asymmetries, shown by two events on August 4, 1972 and January 25, 1971, can be attributed to: (1) tilt of the interplanetary magnetic field (IMF) with respect to the earth's dipole magnetic field which influences the precipitation of energetic solar particles into the polar atmospheres; (2) differences in ozone chemistry caused by the large change in atmospheric temperature between summer and winter hemispheres; (3) seasonal differences of the stratosphere's dynamic states which are affected by upward propagating planetary waves in winter in contrast to the relatively undisturbed zonal flows in summer; and (4) topographic asymmetry between Northern and Southern Hemispheres. These effects are shown by three-dimensional plots of the events in geographic coordinates and by color contour plots of the stratospheric ozone distributions in geomagnetic and geographic polar coordinates, respectively.

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