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O/N2 changes during 1–4 October 2002 storms: IMAGE SI-13 and TIMED/GUVI observations
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Space Science Laboratory, University of California, Berkeley, California, USA
Space Science Laboratory, University of California, Berkeley, California, USA
Thermospheric O/N2 column density ratios referenced at a N2 column density of 1017 cm−2 are obtained using the IMAGE SI-13 and TIMED/GUVI far-ultraviolet (FUV) dayglow data, AURIC simulation results, and MSIS86 model. Each of the magnetic storms occurring during a 4-day period (1–4 October 2002) caused significant O/N2 depletion that was detected by both of the IMAGE SI-13 and GUVI instruments. The depletion extended down to latitudes of 10° and −5° in the Northern and Southern Hemispheres, respectively. Simultaneous measurements show an excellent agreement between the SI-13 and GUVI O/N2 on both global and local scales. The IMAGE SI-13 O/N2 data provide direct optical evidence that the O/N2 depletion corotates with the Earth. The GUVI O/N2 indicate the depletion in both of the hemispheres is not symmetric owing to the seasonal effect and differences in heating and convection induced winds. Both the IMAGE SI-13 and GUVI O/N2 maps also provide a good opportunity for future modeling efforts.
Received 16 February 2004; accepted 13 August 2004; published 29 October 2004.
Citation: (2004), O/N2 changes during 1–4 October 2002 storms: IMAGE SI-13 and TIMED/GUVI observations, J. Geophys. Res., 109, A10308, doi:10.1029/2004JA010441.
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