We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Possible Origin of Ultralow-Frequency Whistlers.
- Authors
Dovbnya, B. V.; Potapov, A. S.
- Abstract
The sonographic analysis of records of ultralow-frequency emissions recorded by the induction magnetometer at the Mirnyi observatory (Antarctica) in 1981–1985 has revealed the presence of a special class of signals in the frequency band 0.25–5 Hz having a characteristic dispersion reminiscent of the dynamic spectra of LHR-whistlers observed in the VLF band. The ULF whistlers are observed, as a rule, at morning and evening hours of local time at moderate values of the Kp-index (0 < Kp < 4). The analysis of the frequency–time behavior of observed signals shows that the canalized propagation of short broadband pulses as magnetosonic waves in the layered medium, for example, in the magnetospheric current sheet can serve as a possible cause of the dispersion. Such sporadic phenomena on the magnetopause as microreconnections or FTE-events may be sources of these pulses.
- Subjects
WHISTLERS (Radio meteorology); ATMOSPHERICS; VLF emissions; RADIO meteorology; IONOSPHERIC radio wave propagation; RADIO frequency; RADIO waves
- Publication
Cosmic Research, 2004, Vol 42, Issue 4, p349
- ISSN
0010-9525
- Publication type
Article
- DOI
10.1023/B:COSM.0000039733.90421.eb