HR: 09:40h
AN: SA11A-05    [Abstracts]
TI: Atmospheric Effects of Coronal Holes and Powerful High-Speed Solar Wind Streams in 2003 Observed by the TIMED Spacecraft
AU: * Kozyra, J U
EM: jukozyra@engin.umich.edu
AF: University of Michigan, Space Research Bldg, 2455 Hayward, Ann Arbor, MI 48109-2143 United States
AU: Crowley, G
EM: gcrowley@swri.edu
AF: Southwest Research Inst., 6220 Culebra Rd, San Antonio, TX 78238-5166 United States
AU: Emery, B A
EM: emery@hao.ucar.edu
AF: NCAR, High Altitude Observatory, Boulder, CO 80307 United States
AU: Fang, X H
EM: xhfang@umich.edu
AF: University of Michigan, Space Research Bldg, 2455 Hayward, Ann Arbor, MI 48109-2143 United States
AU: Hagan, M E
EM: hagan@ucar.edu
AF: NCAR, High Altitude Observatory, Boulder, CO 80307 United States
AU: Lu, G
EM: ganglu@hao.ucar.edu
AF: NCAR, High Altitude Observatory, Boulder, CO 80307 United States
AU: Mlynczak, M G
EM: M.G.Mlynczak@nasa.gov
AF: NASA Langley Research Ctr., MS 420, Hampton, VA 23681-2199 United States
AU: Niciejewski, R J
EM: niciejew@umich.edu
AF: University of Michigan, Space Research Bldg, 2455 Hayward, Ann Arbor, MI 48109-2143 United States
AU: Palo, S E
EM: palo@colorado.edu
AF: University of Colorado, Dept Aerospace Eng Sciences 429 UCB, Boulder, CO 80309-0429 United States
AU: Paxton, L J
EM: larry.paxton@jhuapl.edu
AF: Johns Hopkins Univ., Applied Physics Lab, Laurel, MD 20723-6099 United States
AU: Russell, J M
EM: James.Russell@hamptonu.edu
AF: Hampton University, Ctr Atmospheric Sciences, Hampton, VA 23668 United States
AU: Skinner, W R
EM: wskinner@umich.edu
AF: University of Michigan, Space Research Bldg, 2455 Hayward, Ann Arbor, MI 48109-2143 United States
AU: Solomon, S C
EM: stans@ucar.edu
AF: NCAR, High Altitude Observatory, Boulder, CO 80307 United States
AU: Wu, Q
EM: qwu@ucar.edu
AF: NCAR, High Altitude Observatory, Boulder, CO 80307 United States
AU: Yee, J
EM: sam.yee@jhuapl.edu
AF: Johns Hopkins Univ., Applied Physics Lab, Laurel, MD 20723-6099 United States
AB: Recurrent and powerful high speed streams were responsible for driving a large portion of the magnetic activity during the year 2003. High speed streams in this year were among the most geoffective of the entire solar cycle due both to their long-durations (10's of days) and high velocities. In addition, the polar coronal holes, that provided the source of the high speed streams, also contributed to a significant variation in solar EUV radiation by covering a large fraction of the solar disc each rotation. The TIMED spacecraft with ground-based collaborators made comprehensive measurements of the atmospheric response to these strong, long-duration energy inputs. Initial analysis indicates an interesting coupling between variations in the EUV radiation and solar wind inputs in producing the atmospheric response. The decrease in solar EUV (due to the presence of the coronal hole on the solar disc) begins to precondition the atmosphere several days before the fast coronal hole wind hits the Earth, causing the atmosphere to cool and increasing the O/N2 ratio. Long intervals of recurrent substorm activity triggered by the high speed streams deposit energy in this preconditioned atmosphere. Models indicate that the effects of magnetic activity penetrate deeper in altitude and lower in latitude in such a cooler atmosphere. In addition, enhancements in NO and other changes in atmospheric chemistry driven by the recurrent long-duration substorm activity may not recover before the next high speed stream hits, making for weeks long perturbations. There are also indications that mesospheric tides may be modulated in some way by the high speed stream inputs.
DE: 2427 Ionosphere/atmosphere interactions (0335)
DE: 2479 Solar radiation and cosmic ray effects
DE: 2736 Magnetosphere/ionosphere interactions
SC: SPA-Aeronomy [SA]
MN: 2005 Joint Assembly