Abstract The background of VLF wave-particle experiments from Siple Station, Antarctica, is briefly reviewed. Most of these results are interpreted in terms of Doppler shifted cyclotron interaction between energetic electrons and the VLF waves near the equatorial plane. Single frequency ducted signals that exceed a certain ‘threshold’ intensity are observed at the conjugate point (Roberval, or Lake Mistissini, Quebec) to be amplified 30–50 dB, with temporal growth rates of 30–200 dB/s. Following saturation, variable frequency emissions are triggered. With the addition of a second signal, separated in frequency from the first by Δƒ < 100 Hz, signal growth at both frequencies is reduced and sidebands are generated at frequencies separated from the carriers by integer multiples (up to seven) of Δƒ. The sidebands are attributed to short emissions triggered by the beats between the two input carriers. Midlatitude magnetospheric hiss is crudely simulated by a sequence of 10 ms pulses whose frequencies are chosen randomly within a 400 Hz band. Results show that certain combinations of 10 ms pulses link together to form chorus-like elements, suggesting a common origin for hiss and chorus. In contrast to the equatorial region phenomena are low altitude (1000–8000 km) satellite observations of narrowband Siple pulses showing increases in bandwidth of up to 1000 Hz with impulsive triggered emissions of similar bandwidth; these phenomena are interpreted in terms of a new type of quasi-electrostatic plasma instability in the subauroral region of the magnetosphere, involving 200 m wide field aligned irregularities and occurring at frequencies near the lower hybrid resonance frequency. A new crossed dipole antenna at Siple Station that generates left-hand, right-hand, or linear polarization is used to increase the effective radiated power and to perform polarization experiments.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    VLF wave-injection experiments from Siple Station, Antarctica


    Contributors:

    Published in:

    Publication date :

    1988-01-01


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    Jikiken(EXOS-B) observation of siple transmissions

    Kimura, I. / Matsumoto, H. / Hashimoto, K. et al. | Elsevier | 1981


    VLF line radiation observed at Halley and Siple

    Yearby, K.H. / Matthews, J.P. / Smith, A.J. | Elsevier | 1981