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We investigate the ionospheric behavior in conjugate hemispheres during the3 October 2005 solar eclipse, on the basis of observations of electrontemperature (Te) from the Defense Meteorological Satellites Program (DMSP)spacecraft, F2 layer critical frequency (foF2) and F2 layer peak height(hmF2) at the Grahamstown ionosonde station, and total electron content (TEC)from the Global Positioning System (GPS) station SUTH. The observations showthat when the eclipse occurred in the Northern Hemisphere, there was adecrease in Te, an increase in foF2 and TEC, and an uprising in hmF2 in itsconjugate region compared with their reference values. We also simulated theionosphere behavior during this eclipse using a mid- and low-latitudeionospheric model. The simulations agree well with the observations. Becauseof the eclipse effect, there are far fewer photoelectrons travelling alongthe magnetic field lines from the eclipse region to the conjugate region,resulting in reduced photoelectron heating in the conjugate hemisphere whichcauses a drop in electron temperature and subsequent disturbances in theregion

The ionospheric behavior in conjugate hemispheres during the 3 October 2005 solar eclipse