HR: 1330h
AN: SA12A-1079 [PDF]
TI: Auroral emissions induced by ion precipitation during the 2000 Bastille Day storm
AU: * Stephan, A W
EM: andrew.stephan@nrl.navy.mil
AF: E.O. Hulburt Center for Space Research,
Naval Research Laboratory, 4555 Overlook Ave., SW, Washington, DC 20375 United States
AU: Dymond, K F
EM: kenneth.dymond@nrl.navy.mil
AF: E.O. Hulburt Center for Space Research,
Naval Research Laboratory, 4555 Overlook Ave., SW, Washington, DC 20375 United States
AU: Budzien, S A
EM: sbudzien@ssd5.nrl.navy.mil
AF: E.O. Hulburt Center for Space Research,
Naval Research Laboratory, 4555 Overlook Ave., SW, Washington, DC 20375 United States
AU: McCoy, R P
EM: mccoyr@onr.navy.mil
AF: Office of Naval Research, 800 N. Quincy St., Arlington, VA 22217 United States
AB:
The great geomagnetic storm of 15-16 July, 2000, presented a rare opportunity to study the Sun-Earth system under extreme
conditions. Some of the most vivid manifestations of a geomagnetic storm are the polar aurorae that are particularly
prominent at ultraviolet wavelengths. We present measurements of middle ultraviolet aurorae taken by the Ionospheric
Spectroscopy and Atmospheric Chemistry (ISAAC) experiment on 16 July during the recovery phase of this Bastille Day storm.
ISAAC was launched on the Advanced Research and Global Observation Satellite (ARGOS) in a 850~km circular, 0230/1430~LT
Sun-synchronous orbit and obtained spectra of Earth's limb that include emissions from O$^{+}$, N$^{+}$, N$_{2}$ and NO.
Measurements taken over the nighttime southern pole early in the recovery phase of the storm show strong auroral emissions in
the O~II 247.0~nm line that are consistent with proton precipitation and charge exchange with thermospheric atomic oxygen.
These precipitating protons
are also most likely the same ion population mirroring at low altitudes that are responsible for energetic neutral atoms
(ENAs) observed from high altitude orbit. We corroborate these ISAAC measurements with simultaneous far ultraviolet spectra
of Earth's limb obtained by the Low Resolution Airglow and
Aurora Spectrograph (LORAAS) that was also flown on ARGOS.
DE: 0310 Airglow and aurora
DE: 2455 Particle precipitation
DE: 2704 Auroral phenomena (2407)
DE: 2716 Energetic particles, precipitating
DE: 2788 Storms and substorms
SC: SPA - Aeronomy [SA]
MN: 2003 Fall Meeting