Physics
Scientific paper
Dec 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29.1541f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 12, pp. 1541-1542, IN3, 1543-1557
Physics
Scientific paper
The two most conspicuous features of hydromagnetic emissions are: (1) a rising frequency fine structure and (2) a series of narrow frequency bands. Whereas the fine structure now appears well understood, the narrow frequency bands still require explanation. Results now presented indicate that the bands arise from a process closely related to that responsible for the fine structure; namely, the propagation to Earth along high latitude (60°-70°) geomagnetic field lines of Alfvén (ion cyclotron) waves generated in the vicinity of the equatorial plane. In the case of the bands, however, a resonance process is also involved. Two resonance regions are identified along each field line and it is shown that for high latitude field lines the broad hydromagnetic resonances typical of the region below the Alfvén velocity maximum are actually split into a number of finer resonances. These narrow resonances are apparently high order harmonics of the simple field line resonance discussed earlier by other workers. The frequency spacing of the resulting narrow frequency bands thus depends closely upon the particular field line concerned, and decreases with increasing L value.
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