O/N <sub>2</sub> changes during 1\textendash4 October 2002 storms: IMAGE SI-13 and TIMED/GUVI observations

Abstract
<p>Thermospheric O/N<sub>2</sub> column density ratios referenced at a N<sub>2</sub> column density of 10<sup>17</sup> cm<sup>-2</sup> 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\textendash4 October 2002) caused significant O/N<sub>2</sub> depletion that was detected by both of the IMAGE SI-13 and GUVI instruments. The depletion extended down to latitudes of 10\textdegree and -5\textdegree in the Northern and Southern Hemispheres, respectively. Simultaneous measurements show an excellent agreement between the SI-13 and GUVI O/N<sub>2</sub> on both global and local scales. The IMAGE SI-13 O/N<sub>2</sub> data provide direct optical evidence that the O/N<sub>2</sub> depletion corotates with the Earth. The GUVI O/N<sub>2</sub> 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/N<sub>2</sub> maps also provide a good opportunity for future modeling efforts.</p>
Year of Publication
2004
Journal
Journal of Geophysical Research
Volume
109
Date Published
10/2004
ISSN Number
0148-0227
URL
http://doi.wiley.com/10.1029/2004JA010441
DOI
10.1029/2004JA010441