TitleO/N 2 changes during 1–4 October 2002 storms: IMAGE SI-13 and TIMED/GUVI observations
Publication TypeJournal Article
Year of Publication2004
AuthorsZhang, Y, Paxton, LJ, Morrison, D, Wolven, B, Kil, H, Meng, C-I, Mende, SB, Immel, TJ
JournalJournal of Geophysical Research
Date Published10/2004
KeywordsMagnetic storm; thermospheric composition change

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.

Short TitleJ. Geophys. Res.

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