Initial observations with the Global Ultraviolet Imager (GUVI) in the NASA TIMED satellite mission

被引:325
作者
Christensen, AB [1 ]
Paxton, LJ
Avery, S
Craven, J
Crowley, G
Humm, DC
Kil, H
Meier, RR
Meng, CI
Morrison, D
Ogorzalek, BS
Straus, P
Strickland, DJ
Swenson, RM
Walterscheid, RL
Wolven, B
Zhang, Y
机构
[1] Aerosp Corp, Space Sci Applicat Lab, El Segundo, CA 90245 USA
[2] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA
[3] Univ Colorado, Boulder, CO 80309 USA
[4] Univ Alaska, Fairbanks, AK 99775 USA
[5] SW Res Inst, San Antonio, TX 78238 USA
[6] USN, Res Lab, EO Hulburt Ctr Space Res, Washington, DC 20375 USA
[7] Computat Phys Inc, Springfield, VA 22151 USA
[8] Utah State Univ, Logan, UT 84322 USA
关键词
airglow; aurora; ultraviolet; imaging; satellite; atmosphere;
D O I
10.1029/2003JA009918
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
[1] The Global Ultraviolet Imager (GUVI) instrument carried aboard the NASA TIMED satellite measures the spectral radiance of the Earth's far ultraviolet airglow in the spectral region from 120 to 180 nm using a cross-track scanning spectrometer design. Continuous operation of the instrument provides images of the Earth's disk and limb in five selectable spectral bands. Also, spectra at fixed scanning mirror position can be obtained. Initial results demonstrate the quantitative functionality of the instrument for studies of the Earth's dayglow, aurora, and ionosphere. Moreover, through forward modeling, the abundance of the major constituents of the thermosphere, O, N-2, and O-2 and thermospheric temperatures can be retrieved from observations of the limb radiance. Variations of the column O/N-2 ratio can be deduced from sunlit disk observations. In regions of auroral precipitation not only can the aurora regions be geographically located and the auroral boundaries identified, but also the energy flux Q, the characteristic energy E-o, and a parameter f(o) that scales the abundance of neutral atomic oxygen can be derived. Radiance due to radiative recombination in the ionospheric F region is evident from both dayside and nightside observations of the Earth's limb and disk, respectively. Regions of depleted F-region electron density are evident in the tropical Appleton anomaly regions, associated with so-called ionospheric "bubbles.'' Access to the GUVI data is provided through the GUVI website www.timed.jhuapl.edu\guvi.
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页数:16
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