HR: 11:50h
AN: A52B-07    [Abstracts]
TI: Efficiency of Different Types of Geomagnetic Activity (and Their Solar Drivers) at Producing NOx Capable of Significantly Effecting Stratospheric Ozone
AU: * Kozyra, J U
EM: jukozyra@engin.umich.edu
AF: University of Michigan AOSS Dept., 2455 Hayward, Ann Arbor, MI 48109-2143, United States
AU: Mlynczak, M G
EM: M.G.Mlynczak@nasa.gov
AF: NASA Langley Research Ctr, 21 Langley Blvd, Hampton, VA 23681-2199, United States
AU: Paxton, L J
EM: larry.paxton@jhuapl.edu
AF: Johns Hopkins University Applied Physics Lab, 11100 Johns Hopkins Rd., Laurel, MD 20723-6099, United States
AU: Russell, J M
EM: JAMES.RUSSELL@hamptonu.edu
AF: Hampton University Ctr Atmospheric Sciences, 23 Tyler St., Hampton, VA 23668, United States
AB: Observations demonstrate that magnetic activity produces significant stratospheric ozone loss though the transport of auroral NOx downward in the polar night. In fact, preliminary evidence suggests a solar cycle modulation in the descending NOx (and associated ozone loss) with the maximum during the peak in 2003 of coronal hole high-speed stream activity in the descending phase. The coupling between space weather and stratospheric meteorology is a key ingredient in confining the descending NOx to high latitudes and thus enhancing its ability to destroy ozone. During the maximum high-speed stream activity in 2003, auroral energy input (as indicated by the aa-index) reached a peak exceeding values during the last 4 solar cycles. A newly available 6-year data set of NOx 5.3 micron radiance from TIMED provides information on the variation in the thermospheric source of NOx due to magnetic activity (approximated by NOx radiance poleward of 60 deg MLAT) from solar maximum to solar minimum (late 2001 - 2007). These data will be used to explore the amount of NOx, which is produced in the correct location to be drawn down into the polar vortex, during selected space weather disturbances. A comparison between NOx poleward of 60 deg MLAT and global NOx provides a measure of the relative "effectiveness" of various types and strengths of magnetic activity in producing stratospheric ozone losses. Hemispheric power in particle precipitation derived from observations of auroral emissions by TIMED will be used to examine the corresponding variations in high-latitude energy inputs responsible for the NOx production.
DE: 0310 Airglow and aurora
DE: 0335 Ion chemistry of the atmosphere (2419, 2427)
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
DE: 2455 Particle precipitation
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly