Effects of Solar Activity Variation on the Low Latitude Topside Nighttime Ionosphere

Details Effects of Solar Activity Variation on the Low Latitude Topside Nighttime Ionosphere Effects of Solar Activity Variation on the Low Latitude Topside Nighttime Ionosphere

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa34a..03m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA34A-03

Physics

2415 Equatorial Ionosphere, 2467 Plasma Temperature And Density, 2479 Solar Radiation And Cosmic Ray Effects, 2481 Topside Ionosphere

Scientific paper

We investigate the effects of solar activity variation on the topside nighttime ionosphere of the low latitude region using the DMSP F15 data taken at 840 km altitude as well as the KOMPSAT-1 data taken at 685 km altitude. The change of the ionospheric parameters shows a good correlation with F 10.7 variations, in accordance with 27-day solar rotations. The correlation is especially good when a time delay of 1 to 2 days is incorporated and when the F 10.7 variation is large. Vertical drift velocities and the oxygen ion fractions, observed by DMSP F15, are also seen to have good correlations with F 10.7 with similar time delays. We suspect the delayed correlation of the ionospheric response is closely related to the neutral density changes affected by the solar activity as it has been reported that changes in the solar soft X-rays and the neutral density are well correlated with a delay of approximately 1.5 days. We also compare the ionospheric response for the solar maximum period with that of the declining phase using the data for the period 2000 through 2004 during which average F 10.7 varied from over 200 to around 100. The density does not seem to saturate at high F 10.7 values even during the solar maximum phase, in contrast to the daytime ionospheric response reported previously. The density during the low solar activity cycle is observed to be lower than that of the high solar activity for the same F 10.7 values, implying the long term dependence of the ionosphere in addition to the prompt response of 1 to 2 days.

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