Riser Whistlers at a Ground Station at Low Latitude

Dikshit, S. K.; Somayajulu, V. V.; Tantry, B. A. P.

doi:10.1038/physci230115a0

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…The computed growth rate is mo small to explain tim required amplification [2 l ] m~d hence we suggest that the nonIinear theory of wave particle interaction should be studied to explain the observed power: The effect of inhomogeneous magnedc field [711 and stepdike deformation of the distribution functioa at the boundary between resonant and nou-resonant electrons [26] shou}d be included in the wave-particle interaction to make the model more realistic. The chorus emissions reported in this paper belong to daytime and they are markedly different in frequency and df/dt, with those of the events reported by other workers for nighttime [3,8,9,20]. The nighttime observations were explained in terms of these emis~ sions being generated at high .L~v_alues in the vicinity of the plasma-pause.…”

Section: Generation Mechanismcontrasting

confidence: 61%

VLF emissions from ionospheric/magnetospheric plasma

Patel

Singh

2001

Pramana - J Phys

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VLF emissious such as hiss, chorus, oscillating tones, hiss triggerecl chorus and whistler triggered emissions have been observed at low l~.titude Indian stations. In this paper we present dynamic spectra of these emissions and discuss their various observed tea~:ures. It is argued that most of the emissions are generated during Doppter shifted cyclotron resonance interaction between the whistler mode wave and counter streaming energetic electrons. Resonance energy of the participating electron and interaction length are evaluated to explain the generation mechanism of some of these emissions observed at Indian stations.

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Section: Generation Mechanismcontrasting

confidence: 61%

VLF emissions from ionospheric/magnetospheric plasma

Patel

Singh

2001

Pramana - J Phys

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“…A further possible explanation is that the risers are a manifestation of a plasma instability in the ionosphere associated with the downward flux of plasma into the F region, which cools and contracts when eclipsed. A riser recorded at the low geomagnetic latitude of 24 ø has been reported by Dikshit et al [1971]. These workers consider the signal to be due to energy radiated by a comparatively nearby lightning discharge propagating through the ionosphere and refracted back earthwards at a height of several hundred km where the wave frequency equals the lower hybrid resonance frequency.…”

Section: Ground-based Receiversmentioning

confidence: 93%

VLF Emissions in the Magnetosphere

Rycroft¹

1972

Radio Science

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Recent observations of both naturally occurring and triggered VLF emissions (a few KHz) made on the ground, aboard rockets, and aboard satellites are discussed. Although reference is made to auroral‐zone emissions, attention is concentrated on midlatitude discrete emissions such as chorus. Following Brice [1964] and Kennel and Petschek [1966], the signals are interpreted as arising from the transverse resonance (or cyclotron) instability of magnetospheric plasma in the equatorial plane in the vicinity of the plasmapause. The energy of the gyroresonant electrons is estimated; the precipitation of these energetic electrons from the radiation belts is a consequence of the interaction.

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“…Dikshit et al [15] have noted strong absorption for whistler waves of frequency 2-6 kHz in the Earth-ionosphere waveguide mode of propagation for distances 6000-7000 km. In our case, the distance travelled by the whistlers as discussed above is more than 4000 km and hence the upper frequencies above ~ 5.0 kHz may have been attenuated.…”

Section: Interpretations and Discussionmentioning

confidence: 98%

Some unusual high dispersion whistler triplets recorded at a low L-value (L=1.17)

Singh

Singh²,

Altaf

et al. 2009

Indian J Phys

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A detailed analysis of the VLF data collected during January to December, 2003 at the low latitude station Jammu (geomag. lat., 22 0 26 / N; L = 1.17) has yielded some unusual VLF events like whistler triplets of very high dispersion D ~ 70 -90 sec 1/2 . From the dispersion analysis of the whistler triplets, it is found that the individual whistlers of the triplets are one-hop high dispersion ducted whistlers having propagation path along higher and closely spaced L-values (L~4.0) than the L-value of the recording station. The dispersion and occurrence characteristics of these high dispersion whistlers of the triplets are compared with those of the majority of low dispersion whistlers (D ~ 30 -40 sec 1/2 ) recorded during the same period. Generation and propagation mechanisms are briefly discussed.

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Riser Whistlers at a Ground Station at Low Latitude

Cited by 9 publications

References 5 publications

VLF emissions from ionospheric/magnetospheric plasma

VLF emissions from ionospheric/magnetospheric plasma

VLF Emissions in the Magnetosphere

Some unusual high dispersion whistler triplets recorded at a low L-value (L=1.17)

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