Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41c..08w&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA41C-08
Physics
0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition, 2423 Ionization Mechanisms, 2479 Solar Radiation And Cosmic Ray Effects, 7538 Solar Irradiance
Scientific paper
Solar irradiance in the vacuum ultraviolet and X-ray regions of the spectrum creates planetary ionospheres and thermospheres, and is the most important source of their variability. Accurate measurements of the far ultraviolet are available, but spectrally resolved extreme ultraviolet and soft X-ray estimates have relied on older, variously calibrated observations. Recent broadband measurements by the SNOE satellite have revealed that solar irradiance in the soft X-ray to hard EUV region of the spectrum (about 1 to 30 nm) is much more intense than the earlier estimates [Bailey et al., JGR 105, 27179, 2000]. The effect of this revision on ionization rates has resolved outstanding issues in lower ionosphere modeling [Solomon et al., GRL 28, 2149, 2001]. Ionization rates are but one aspect of this finding. Photoelectron fluxes, dissociation rates, ion/neutral composition, and heating/cooling rates are all changed by this revision. The importance of these effects will be summarized in this paper. However, because the new measurements have limited spectral resolution, our knowledge is incomplete. Imminent measurements by the TIMED Solar EUV Experiment will vastly improve our understanding of solar irradiance, but spectral resolution shortward of about 25 nm will be similar to SNOE. Goals for improving the spectral resolution of solar irradiance measurements on upcoming rocket experiments and future space flight missions are presented. The requirements for accurate atmospheric modeling will also be discussed.
Bailey Scott M.
Solomon Stanley C.
Woods Thomas N.
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