#### Author ORCID Identifier

Kristina Lynch: https://orcid.org/0000-0001-9006-1138

#### Document Type

Article

#### Publication Date

2012

#### Publication Title

Journal of Geophysical Research

#### Department

Department of Physics and Astronomy

#### Abstract

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.

#### DOI

10.1029/2011JA017037

#### Original Citation

Lundberg, E. T., Kintner, P. M., Powell, S. P., and Lynch, K. A. (2012), Multipayload interferometric wave vector determination of auroral hiss, *J. Geophys. Res.*, 117, A02306, doi:10.1029/2011JA017037.

#### Dartmouth Digital Commons Citation

Lundberg, E. T.; Kintner, P. M.; Powell, S. P.; and Lynch, Kristina A., "Multipayload interferometric wave vector determination of auroral hiss" (2012). *Dartmouth Scholarship*. 4302.

https://digitalcommons.dartmouth.edu/facoa/4302