HR: 0800h
AN: SA21A-0337 [Abstracts]
TI: Observations of Ultraviolet Emission from Mg$^+$ in the Lower and Middle Thermosphere
AU: * Minschwaner, K
EM: krm@nmt.edu
AF: Department of Physics, New Mexico Institute of Mining and Technology, Socorro, NM 87801
United States
AU: Shukla, N
EM: nirav241@nmt.edu
AF: Department of Physics, New Mexico Institute of Mining and Technology, Socorro, NM 87801
United States
AU: Fortna, C
EM: cfortna@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: Budzien, S
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: Dymond, K
EM: kdymond@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
EM: mccoyr@onr.navy.mil
AF: Office of Naval Research, 800 North Quincy Street, Arlington, VA 22217
United States
AB:
New observations of ionized magnesium dayglow are reported from the Ionospheric Spectroscopy and Atmospheric Chemistry
(ISAAC) instrument on the ARGOS satellite. We focused on two periods, October 14-28 1999 and November 15-30 1999, when ISAAC
obtained high quality limb spectra between 2600 and 3000 \AA\ and from 85 to 350 km tangent altitude. In addition to the
resonant scattering by Mg$^+$ near 2800 \AA, these limb spectra also contain signatures of fluorescent scattering by nitric
oxide in the gamma bands, emission by molecular nitrogen in the Vergard-Kaplan bands, and atomic emission by oxygen in the
2972 \AA\ line. A retrieval algorithm has been developed to measure the abundance of nitric oxide using the intensity of
fluorescent scattering in the $\gamma$ (1,5) band at 2670 \AA. This technique then allows for separating the overlapping
emission by nitric oxide in the $\gamma$ (1,6) band from the Mg$^+$ doublet at 2800 \AA. Retrieved Mg$^+$ column densities
have been mapped as a function of altitude and geomagnetic latitude.
DE: 0310 Airglow and aurora
DE: 0335 Ion chemistry of the atmosphere (2419, 2427)
DE: 0355 Thermosphere--composition and chemistry
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting