Multipayload interferometric wave vector determination of auroral hiss

Details Multipayload interferometric wave vector determination of auroral hiss Multipayload interferometric wave vector determination of auroral hiss

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11702306l&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A2, CiteID A02306

Computer Science

Sound

Electromagnetics: Plasmas, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Electric Fields (2712), Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Ionosphere: Instruments And Techniques

Scientific paper

We extend traditional, single payload, interferometric techniques to a multiple payload sounding rocket mission, and apply these techniques to measure the parallel and perpendicular wavelength of auroral VLF hiss from 8 kHz-20 kHz. We model the wavelength distribution of auroral hiss as a cone at a fixed angle with respect to the magnetic field that is isotropically distributed in the perpendicular plane. We apply this model to calculate the interferometric observables, coherency and phase, for a sounding rocket mission whose wave electric field receivers are on payloads that are separated 2-3 km along the magnetic field and 55-200 m across the magnetic field. Using an interferometer formed by comparing the collinear sphere-to-skin electric field antennas on a single payload, we estimate a lower limit on the perpendicular wavelength of VLF hiss of ˜60 m. Analysis of coherency and phase due to this conical wave vector distribution for a multipayload interferometer reveals the existence of a spin dependent coherency pattern. From this coherency pattern we generate an upper limit perpendicular wavelength estimate for VLF hiss of ˜350 m. The inter-payload phase gives an accurate estimate of the parallel wavelength of ˜6000-8000 m. This parallel wavelength is combined with the lower (upper) limit perpendicular wavelength estimates to generate upper (lower) limits on wave-normal angle. These limits are each within one degree of the predicted electrostatic whistler wave resonance cone angle verifying that VLF hiss propagates on this resonance cone.

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