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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 111,
A12308,
9 PP., 2006
doi:10.1029/2006JA011923
Observations of colocated optical and radar aurora
Center for Geospace Studies, SRI International, Menlo Park, California, USA
Earth and Atmospheric Sciences, Cornell University, Ithaca, New York, USA
Geophysical Institute, University of Alaska, Fairbanks, Alaska, USA
Department of Physics and Astronomy, Clemson University, Clemson, South Carolina, USA
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
This article presents case studies of common volume observations of the E region radar aurora obtained with a 30 MHz imaging radar and the optical aurora (green line emissions) recorded by an all sky camera. In addition, in situ rocket electric field measurements in the vicinity of an auroral arc are presented in a separate case study. As inferred from the measurements, the radar aurora in the vicinity of a stable evening auroral arc arises because of the arc's polarization electric fields, which excite the two stream instability and generate electron density irregularities at meter scales. The radar aurora is the backscattering of radar waves from these irregularities.
Received 20 June 2006; accepted 28 September 2006; published 14 December 2006.
Citation: (2006), Observations of colocated optical and radar aurora, J. Geophys. Res., 111, A12308, doi:10.1029/2006JA011923.
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