Propagation Characteristics and Generation Mechanism of ELF/VLF Hiss Observed at Low-latitude Ground Station (L = 1.17) |
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| Authors: | Kalpana Singh Rajesh Singh A K Singh R P Singh |
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| Institution: | (1) Atmospheric Research Lab., Physics Department, Banaras Hindu University, Varanasi, 221005, India;(2) Indian Institute of Geomagnetism, New Panvel, Navi Mumbai, 410 218, India |
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| Abstract: | Extremely low frequency (ELF)/Very low frequency (VLF) hiss is whistler mode wave that interacts with energetic electrons
in the magnetosphere. The characteristics features of ELF/VLF hiss observed at low latitude ground station Jammu (Geomag.
lat. 22°16′ N, L=1.17) are reported. It is observed that most of hiss events first propagate in ducted mode along higher L-values (L = 4–5), after reaching lower edge of ionosphere excite the Earth-ionosphere waveguide and propagate towards equator to be
received at low-latitude station Jammu. To understand the generation mechanism of ELF/VLF hiss, incoherent Cerenkov radiated
power from the low-latitude and mid-latitude plasmasphere are evaluated. Considering this estimated power as an input for
wave amplification through wave–particle interaction, the growth rate and amplification factor is evaluated which is too small
to explain the observed wave intensity. It is suggested that some non-linear mechanism is responsible for the generation of
ELF/VLF hiss. |
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| Keywords: | ELF/VLF hiss incoherent Cerenkov radiation wave growth wave– particle interaction plasmasphere |
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