An experimental study of wave packets in travelling ionospheric disturbances

Details An experimental study of wave packets in travelling ionospheric disturbances An experimental study of wave packets in travelling ionospheric disturbances

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jastp..61..629y&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 61, Issue 8, p. 629-639.

Physics

3

Scientific paper

The complex demodulation method was employed to analyse observations of TIDs carried out by means of multifrequency HF Doppler sounding at vertical incidence over Almaty (76°55'E, 43°15'N). Two types of behaviour of the amplitude and phase in the band-pass filtered Doppler shift oscillations were revealed. These were packet-like wave structures and quasi-stochastic TIDs. A study of the phase behaviour inside wave packets showed that most of them had a quasi-monochromatic structure, some of them had oscillations with a period which increased with time, and none had oscillations with a period which decreased with time. Phase jumps between nearby packets were explained as a result of interference between two adjacent packets having similar oscillation periods. A method of calculating the correlation coefficient for the wave packets propagating on a background of quasi-stochastic TIDs was developed. This showed that wave packets (having periods between 7 and 50 min) travelled in the vertical plane practically without any loss of coherence, while quasi-stochastic TIDs had a short coherence length; the velocity of the quasi-stochastic TIDs was noticeably larger than that of the wave packets.

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