Physics
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3907101s&link_type=abstract
Geophysical Research Letters, Volume 39, Issue 7, CiteID L07101
Physics
Ionosphere: Auroral Ionosphere (2704), Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Wave/Particle Interactions (7867), Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Radio Science: Ionospheric Propagation (0689, 2487, 3285, 4275, 4455)
Scientific paper
This is a report on the first observations of auroral roar emissions near 4 times the ionospheric electron cyclotron frequency (fce) with a passive receiver installed in Svalbard, Norway. 4fce roar emissions were detected from 5.27 to 5.70 MHz during moderate geomagnetic disturbances in 22 days between May and September 2011 only from noon to evening, while no event occurred during the winter season. An analysis of a typical event shows that the electron density profile measured from EISCAT Svalbard dynasonde satisfies the condition that the upper frequency of the 4fce roar is nearly equal to both upper hybrid resonance frequency (fUH) and 4fce at 238-km altitude. These observations support the idea expanded from the most commonly-accepted generation mechanism of 2fce and 3fce roar: the origin of 4fce roar is upper hybrid waves favorably generated under the condition of fUH ∼ 4fce in the auroral F-region ionosphere.
Ogawa Yasumasa
Ono Takafumi
Sato Naoko
Sato Yuzuru
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