The Advanced Ionospheric Sounder at Halley (75° 31′S, 26° 59′W) in Antarctica has been used to observe the F-region disturbance caused by an atmospheric gravity wave. Observations at 4.5 MHz were used to examine the variations of group range, obtained from time-of-flight measurements, and of Doppler shift, derived from Fourier analysis of the quadrature components of the signal. A comparison of simultaneous values of group-range and phase-path velocities shows clear evidence of compression and rarefaction of ionization and more complicated changes in the height distribution of ionization in the oscillatory changes associated with the wave.
ASJC Scopus subject areas
- Environmental Science(all)
- Atmospheric Science
- Earth and Planetary Sciences(all)