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Ground‐based observations of radio emissions near 2 f ce and 3 f ce in the auroral zone
Author(s) -
Weatherwax A. T.,
LaBelle J.,
Trimpi M. L.,
Brittain R.
Publication year - 1993
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/gl020i014p01447
Subject(s) - ionosphere , cyclotron , physics , ground level , atmospheric sciences , electron , environmental science , geology , geophysics , nuclear physics , architectural engineering , ground floor , engineering
Narrow band emissions at frequencies near twice and three times the ionospheric electron cyclotron frequency have been observed with a ground based receiver located at Two Rivers, Alaska (near Fairbanks). The emissions at twice the local ionospheric electron cyclotron frequency ( ≈ 2.50–2.80 MHz) appear similar in frequency, intensity, local time dependence, and temporal structure to auroral “roar” events previously observed at Churchill, Manitoba [Kellogg and Monson, 1979; 1984]. The observation of emissions near 3 f ce ( ≈ 3.66–4.24 MHz), sometimes observed simultaneously with the 2 f ce events, represents a new aspect of this phenomenon. A quantitative theoretical understanding of the phenomenon has not yet been achieved.