Accession Number : AD0777812

Title :   Conjugate Magnetospheric Transmissions at VLF from Alaska to New Zealand.

Descriptive Note : Rept. for Jul 72-Aug 73,


Personal Author(s) : McPherson,Donald A. ; Koons,Harry C. ; Dazey,Mitchell H. ; Dowden,R. L. ; Amon,L. E. S.

Report Date : 15 APR 1974

Pagination or Media Count : 20

Abstract : A very-low-frequency (VLF) magnetospheric transmission experiment was conducted between Port Heiden, Alaska and Dunedin, New Zealand during August, 1972. Port Heiden is on an L-shell of 2.9 and is located 174-km geomagnetic north and 110-km geomagnetic east of the conjugate point for Dunedin. Whistler signals generated by the transmitter were detected at Dunedin for frequencies 6.8 and 21 kHz. The data show: strong fluctuations in whistler amplitude over time periods of seconds, a relatively even distribution of amplitudes over a 10 dB range, and a weak dependence of amplitude on pulse length with the maximum intensity occurring for 0.2 to 0.4 sec pulse length. These characteristics are consistent with the concept that the waves are amplified by means of the doppler shifted cyclotron resonance with energetic electrons. (Author)

Descriptors :   *Magnetosphere, *Radio transmission, Very low frequency, Whistlers, Alaska, New Zealand

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE