Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0258e&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0258
Physics
2409 Current Systems (2721), 2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2423 Ionization Processes (7823), 2479 Solar Radiation And Cosmic Ray Effects
Scientific paper
Photons from solar X-ray flares arrive at the Earth only eight minutes after emission. The short wavelength region of the solar spectrum is effective in modifying the ionization of the dayside upper atmosphere. For periods like the 2003 Halloween Solar events, the solar flares enhanced the E and D regions significantly over the quiet time background ionosphere. The effects of these enhancements on HF and VLF signal propagation and absorption are well understood and widely known. We present studies of the space weather impacts of sustained, elevated solar x-ray and EUV levels of the background spectrum during solar active times related to the changes in the dayside conductivities. We show that not only the dayside conductivities sustain at an order of magnitude higher values than background levels, but the Pedersen-to-Hall conductivity ratio increases by a factor of 2 to 3 during high solar X-ray periods when compared to quiet periods. The effects of prompt changes of the dayside conductivities associated with a solar flare event on the dynamo electric fields and ionospheric currents are then systematically examined by using a model of the low-latitude ionospheric electrodynamics.
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