HR: 1340h
AN: SA43A-1064    [Abstracts]
TI: First Ground-Based Measurements of OI 6300 \AA $ $ Daytime Aurora Over Boston in Response to the 30 October 2003 Geomagnetic Storm
AU: * Pallamraju, D
EM: dpraju@bu.edu
AF: Center for Space Physics, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 United States
AU: Chakrabarti, S
EM: supc@bu.edu
AF: Center for Space Physics, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 United States
AB: High-Resolution Imaging Spectrograph using Echelle grating (HIRISE) is a high-spectral resolution (0.12 \AA $ $ at 6300 \AA) 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 \AA $ $ 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 70$^{o}$ - 115$^{o}$ 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 74$^{o}$ and the solar background continuum was 4 Mega-Rayleighs \AA$^{-1}$. 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 N$_{e}$, T$_{e}$ and T$_{i}$ 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.
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2435 Ionospheric disturbances
DE: 0310 Airglow and aurora
DE: 0358 Thermosphere--energy deposition
DE: 0394 Instruments and techniques
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting