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Auroral and low latitude VLF hiss

Singh, DK and Patel, RP and Singh, RP (2001) Auroral and low latitude VLF hiss. Indian Journal of Radio and Space Physics, 30 (1). pp. 24-30.

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The morphological features of VLF hiss observed at the auroral and low latitude stations are summarized and generation mechanisms are discussed. The suggestion that these waves are generated by Cerenkov mechanism is reexamined by computing incoherent Cerenkov radiated power from the soft and energetic electrons present in the inner magnetosphere, which falls short of the measured power spectral density. To explain the difference between the measured and computed spectral density it is suggested that the generation mechanism of VLF hiss is a two-step process. In the first step, waves are generated by incoherent Cerenkov process from the soft electrons present in the magnetosphere and as a second step, these small amplitude waves are amplified during interaction with energetic electrons having anisotropic velocity distribution function. It is shown that the low latitude hiss consists of midlatitude hiss and equatorial hiss. Alternative generation mechanism for the equatorial hiss in terms of lightning discharges has also been discussed.

Item Type: Article
Additional Information: Copyright of this article belongs to NISCAIR.
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 14 Mar 2015 18:19
Last Modified: 14 Mar 2015 18:19

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