First ground-based OI 630 nm optical measurements of daytime cusplike and F-region auroral precipitation

Details First ground-based OI 630 nm optical measurements of daytime cusplike and F-region auroral precipitation First ground-based OI 630 nm optical measurements of daytime cusplike and F-region auroral precipitation

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3108807p&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 8, CiteID L08807

Physics

3

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Thermosphere-Energy Deposition, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Instruments And Techniques, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

We have used a high-resolution (0.012 nm at 630 nm) imaging spectrograph to measure auroral emissions in daytime along the magnetic meridian from Sondrestrom Incoherent Scatter Radar (ISR) facility, at Kangerlussuaq, Greenland (67°N, 51°W 74.5°N Mag. Lat.). Measured red line (OI 630 nm) brightness during a magnetically disturbed day (January 21, 2001) shows emission enhancements starting at 1330 UT (1130 MLT) and reaching a four-fold enhancement above the normal dayglow brightness about two hours later. The onset enhancement, characterized by a sharp equatorward boundary, was measured concurrently with ISR Ne and Te, whose morphologies are generally indicative of cusplike precipitation. The 630 nm emission enhancements after 1518 UT correspond to a series of post-noon F-region arcs as measured by the ISR. Modeled 630 nm airglow brightness using ISR data, agree well with both the brightness and time history of the daytime optical measurements.

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