Coordinated investigations of daytime redline optical emissions and incoherent scatter radar measurements from Sondrestromfjord, Greenland

Details Coordinated investigations of daytime redline optical emissions and incoherent scatter radar measurements from Sondrestromfjord, Greenland Coordinated investigations of daytime redline optical emissions and incoherent scatter radar measurements from Sondrestromfjord, Greenland

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa41a1717d&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA41A-1717

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora

Scientific paper

Magnetosphere-ionosphere coupling has been observed via optical emissions, radio and in-situ satellite measurements but much is left to be explored regarding the relation between daytime optical emission and ambient plasma conditions. A particularly useful optical emission for such studies is the atomic oxygen red line at 630nm. The High Resolution Imaging Echelle Spectrograph (HIRISE) instrument allows daytime red line measurement along magnetic longitude from Sondrestromfjord. The mechanisms that contribute to this daytime red line emission at high latitudes are photoelectron impact on atomic oxygen, dissociative recombination, photodissociation of molecular oxygen, collisions of thermal electrons with oxygen atoms, and interaction of incident flux of energetic particles with oxygen. Measurements from HIRISE can be used to characterize the relative importance of these mechanisms and has been previously used to measure optical intensity enhancements coincident with regions of enhanced electron density as measured by Sondrestromfjord incoherent scatter radar (ISR). These measured emissions also show agreement with plasma parameter driven emission models (Pallamraju et al., J. Geophys. Res., 106, 5543-5549, 2001). The work reported here presents HIRISE and ISR data collected simultaneously over multiple days in 2005 and 2006, thereby providing a rich dataset for the comparison of the relative importance of plasma parameters to red line emission intensity.

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