Propagation Characteristics and Generation Mechanism of ELF/VLF Hiss Observed at Low-latitude Ground Station ( L = 1.17)

Details Propagation Characteristics and Generation Mechanism of ELF/VLF Hiss Observed at Low-latitude Ground Station ( L = 1.17) Propagation Characteristics and Generation Mechanism of ELF/VLF Hiss Observed at Low-latitude Ground Station ( L = 1.17)

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007em%26p..100...17s&link_type=abstract

Earth, Moon, and Planets, Volume 100, Issue 1-2, pp. 17-29

Physics

2

Elf/Vlf Hiss, Incoherent Cerenkov Radiation, Wave Growth, Wave&Ndash, Particle Interaction, Plasmasphere, Wave–Particle Interaction

Scientific paper

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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