HR: 09:10h
AN: SA31A-03    [Abstracts]
TI: Ionization frequencies calculated using TIMED/SEE observations
AU: * Yee, J
EM: sam.yee@jhuapl.edu
AF: The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Talaat, E R
EM: elsayed.talaat@jhuapl.edu
AF: The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Woods, T
EM: tom.woods@lasp.colorado.edu
AF: University of Colorado LASP, UCB 590, Boulder, CO 80309 United States
AU: Eparvier, F
EM: eparvier@lasp.colorado.edu
AF: University of Colorado LASP, UCB 590, Boulder, CO 80309 United States
AU: Solomon, S C
EM: stans@ucar.edu
AF: NCAR High Altitude Observatory, 3450 Mitchell Lane, Boulder, CO 80301 United States
AB: The recent measurements of the solar extreme ultraviolet (EUV) irradiance by the TIMED Solar EUV Experiment (SEE) have allowed us to re-examine the ionization frequencies for part of decreasing phase of the solar cycle 23. In the past, ionization frequencies for various species (CO2, O, O2, N2) have been calculated based on limited observations from satellites and rockets and their solar cycle dependence was parameterized from discrete sets of measurements. We compare the ionization frequencies obtained from TIMED/SEE to those presently in use in the community. We also examine the time evolution of these frequencies on several time scales - solar cycle and solar rotational variability as well as short-term flare activity. The relationship of these ionization frequencies to different solar indices will also be discussed.
DE: 2162 Solar cycle variations (7536)
DE: 2423 Ionization mechanisms
DE: 2479 Solar radiation and cosmic ray effects
SC: SPA-Aeronomy [SA]
MN: 2005 Joint Assembly