Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21b0260y&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM21B-0260
Physics
2400 Ionosphere (6929), 2483 Wave/Particle Interactions (7867), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2704 Auroral Phenomena (2407), 2772 Plasma Waves And Instabilities (2471)
Scientific paper
It has been demonstrated by Sonwalker and Harikumar(2000) that auroral hiss generated at aurora precipitation region cannot get access to the ground level unless scattered by meter scale density irregularities. Nevertheless auroral hiss is often observed at ground level. High resolution ground based observation of auroral hiss at South Pole station revealed many types of fine structures of auroral hiss. These structures include discrete features with bandwidth of a few kHz.The most typical center frequency is 150 kHz and sometimes increases or decreases as a function of time. In this raytracing study,we launched rays matching the Cerenkov resonance condition from top of the ionosphere and find their cross points with a ray whose wave normal angle is within the transmission cone at the bottom side of the ionosphere. Using the matching condion of wave number vectors at the cross points, the wave length of the field aligned density irregularities can be calculated. It is promising that the scattering mechanism can explain the discrete features in auroral hiss fine structure. If so, this method combined with ground based observation of auroral hiss makes it possible for us to remote sense the scale sizes of ionospheric plasma density irregularities in the aurora zone.
LaBelle James
Weatherwax A.
Ye Shuzhen
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