Ionospheric Changes Observed Over Waltair(Dip 20°N)During the Total Solar Eclipse of 24th October 1995

于1995年10月24日印度華特（傾角20°北）上空電離層之變化

P V S Rama Rao；D S V V D Prasad；P Sri Ram；P T Jayachandran

Solar Eclipse ； Electron Density ； Critical Frequency ； Virtual Height ； Quasi Periodic Variations

Terrestrial, Atmospheric and Oceanic Sciences

8卷2期（1997 / 06 / 01）

203 - 212

英文

During the total solar eclipse period on 24 October 1995,the ionosphericdata derived from Faraday rotation,differential Doppler frequency shift,and HF Doppler sounding at Lunping Observatory were used to detect thetraveling ionospheric disturbances associated with the solar eclipse of thatday.These observed ionospheric disturbances were characterized by quasiperiodic wave-like trains lasting for several cycles with wavelengths ofaround 193km,periods of around 12-14 min and propagated with a horizontal velocity of around 296 m/s from the direction of the eclipse path tothe observation site.By use of a simplified bow wave front model,thesetraveling ionospheric disturbances are interpreted as the freely propagatedatmospheric gravity waves generated by the supersonic movement of theMoon's shadow through the Earth's atmosphere along the eclipse path.