Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3623101h&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 23, CiteID L23101
Physics
Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Cusp, Magnetospheric Physics: Magnetopause And Boundary Layers
Scientific paper
Observations of dayside auroral hydrogen emissions of Hα (λ656.3 nm) were carried out using spectrometers on Svalbard at Ny-Ålesund (NYA: 76.3°N, 111.0°E CGM) and Longyearbyen (LYR: 75.3°N, 111.9°E CGM). Using a Monte Carlo model, simulated Doppler profiles were fitted to the spectra to estimate precipitating proton energy. A difference in energy was found between the sites for approximately 45 minutes. When combined with measurements of antisunward convection, the energies are consistent with the inverse variation of ion energy with latitude observed by satellites in the cusp region, known as the ion velocity filter. This is the first measurement of the ion velocity filter effect in the dayside aurora using ground-based optical instrumentation. The increasing difference in energy observed is interpreted as a measure of the decreasing merging rate at the magnetopause.
Deehr Charles S.
Holmes Jeremy M.
Kozelov Boris V.
Lorentzen Dag A.
Peters N. J.
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