HALOE Observations of Perturbations in High Northern Latitude NO and Ozone During the April 2002 Solar Storm Episode

Details HALOE Observations of Perturbations in High Northern Latitude NO and Ozone During the April 2002 Solar Storm Episode HALOE Observations of Perturbations in High Northern Latitude NO and Ozone During the April 2002 Solar Storm Episode

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa12a..12a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA12A-12

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0300 Atmospheric Composition And Structure, 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The April 2002 solar storm event provides a unique opportunity to study the resulting effects on upper atmospheric constituents such as NO and ozone. Two sources may perturb these constituents. For a magnetic-storm-source, energetic particles collide with and dissociate nitrogen molecules in the lower thermosphere to produce excited nitrogen atoms which then combine with O to produce NO. The NO subsequently gets transported down to lower altitudes where it reacts with and thus destroys mesospheric and possibly stratospheric ozone. For a solar-particle-event-source, high-energy particles penetrate directly into the mesosphere, break apart nitrogen molecules and water vapor, creating NOx and HOx to destroy ozone in the middle atmosphere. We present perturbations in high northern latitude NO and ozone as measured by the Halogen Occultation Experiment (HALOE) aboard the Upper Atmosphere Research Satellite between April 20-27. HALOE observations show an order of magnitude increase in mesospheric NO and a factor of ~2 decrease in mesospheric O3. We will also compare these observations with NASA GSFC 2D model computations.

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