First Ground-Based Measurements of OI 6300 Å Daytime Aurora Over Boston in Response to the 30 October 2003 Geomagnetic Storm

Details First Ground-Based Measurements of OI 6300 Å Daytime Aurora Over Boston in Response to the 30 October 2003 Geomagnetic Storm First Ground-Based Measurements of OI 6300 Å Daytime Aurora Over Boston in Response to the 30 October 2003 Geomagnetic Storm

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa43a1064p&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA43A-1064

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 0310 Airglow And Aurora, 0358 Thermosphere: Energy Deposition, 0394 Instruments And Techniques

Scientific paper

High-Resolution Imaging Spectrograph using Echelle grating (HIRISE) is a high-spectral resolution (0.12 Å at 6300 Å) spectrograph developed at Boston University that is capable of unambiguously measuring the daytime airglow/auroral emissions buried in the strong solar background continuum of the daytime sky. HIRISE measurements of OI 6300 Å emissions made during daytime on 30 October 2003 from Boston revealed a prolonged auroral activity from 1415 - 1900 LT. The solar zenith angles varied from 70o - 115o during that interval. Intense enhancement in brightness of as high as 38 Kilo Rayleighs were observed at 1509 LT. These magnitudes were six times larger than the normal daytime emission rates for that day. During this event the solar zenith angle was 74o and the solar background continuum was 4 Mega-Rayleighs Å-1. Such large enhancements in brightness were due to the daytime aurora generated in response to an X-class Coronal Mass Ejection on the Sun. The measured daytime airglow emissions show good agreement, both, in the magnitudes and in the temporal variability with the emissions modeled by using as inputs the Ne, Te and Ti profiles that were measured by the Millstone Hill Incoherent Scatter Radar located 100 km away from the spectrograph. It was possible to make such unique measurements due to the measurement capability of HIRISE. Such measurements present a new perspective in understanding complex Space Weather interactions, especially during such severe geomagnetic storms.

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