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Whistler‐mode signals: Group delay by crosscorrelation
Author(s) -
Thomson N. R.
Publication year - 1975
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl002i010p00451
Subject(s) - whistler , signal (programming language) , mode (computer interface) , physics , ultra high frequency , acoustics , remote sensing , geodesy , azimuth , telecommunications , geology , computer science , optics , magnetic field , quantum mechanics , programming language , operating system
Group travel times of 18.6 kHz whistler‐mode signal from NLK, Seattle, to Wellington, New Zealand, are now being measured using the normal FSK transmissions. This is done using a mini‐computer programmed to perform real‐time cross correlations between two receivers: one receiver gets its signal from a whip aerial on which the ground wave (subionospheric mode) dominates, while the other gets its signal from a loop oriented for minimum ground wave. Group travel time can thus be measured continuously while there are whistler‐mode signals present. Delays of 0.2–0.8 seconds have been found.