Computer Science – Sound
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977kosis..15..791s&link_type=abstract
Kosmicheskie Issledovaniia, vol. 15, Sept.-Oct. 1977, p. 791, 792. In Russian.
Computer Science
Sound
Dawn Chorus, Electromagnetic Noise Measurement, Kp Index, Solar Activity Effects, Ionospheric Sounding, Spectrum Analysis, Very Low Frequencies, Whistlers
Scientific paper
A study of VLF-choruses recorded at the Lovozero Station from November 1973 through January 1974 in the frequency range from 2 to 6 kHz is presented. A sonograph was used to analyze the recordings. It was observed that choruses with large values of total Kp index (for the preceding 12-hour period) have larger values of the tangent of the inclination angle of chorus elements (expressed in kHz/sec) than choruses with small total Kp indices. Choruses with Kp indices greater than 8 were only observed in the 3:00 to 12:00 hour local time range, whereas choruses with lower Kp indices were observed at all local times. Dawn choruses were observed to manifest a decreasing tangent of the inclination angle with advancing local time.
Sazhin Sergei S.
Titova Evgenia
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