Computer Science – Sound
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa21a..05p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA21A-05
Computer Science
Sound
7954 Magnetic Storms (2788), 0310 Airglow And Aurora, 2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2494 Instruments And Techniques
Scientific paper
Recent application of high spectral resolution echelle spectroscopy using Boston University HIRISE instrument to study dayside aurora from Sondrestrom has yielded the first unambiguous optical measurements of 630 nm emission from the cusp and from soft F-region arcs. Since April 2005 HIRISE has been commissioned at Sondrestrom for daytime measurements of aurora through the summer. ISR soundings are essential to support these ground based optical measurements as they provide Ne and Te morphologies as a function of altitude, that are typical to the polar ionosphere under the influence of soft arcs and the cusp (or both). In the present investigation, we take a more quantitative approach by driving a state-of-the-art aeronomcal emission model (GLOW) using ISR Ne and Te measurements in order to estimate total non-auroral 630 nm brightness. The GLOW model, which has recently been shown to predict E- and lower F-region Ne to within 5% through the solar cycle and over a wide range of solar zenith angles, also predicts 630 nm emission due to Schumann-Runge band, as well as O+2 dissociative recombination, thermal electron, and photoelectron stimulation of the red line parent species O (1D). Contemporaneous 630 nm measurements by HIRISE, which measures integrated brightness from all sources including electron precipitation, will be used to estimate auroral red line excess as compared with GLOW model predictions for a select number of case study arcs. This line of investigation offers a purely ground-based method to gauge the flux of sub-300 eV auroral electrons -- an energy range well below the cutoff for E-region inversion techniques. Data from the month-long CAWSES Space Weather campaign of September 2005 will be used when ISR data exists for the whole month. We will present results from the days during which, we have contrasting cases of F-region arcs and E-region arcs along with simultaneous ground based redline data.
Doe Richard
Pallamraju Duggirala
Solomon Sean
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