Outstanding issues in the theory of radar aurora: Evidence from the frequency dependence of spectral characteristics

Details Outstanding issues in the theory of radar aurora: Evidence from the frequency dependence of spectral characteristics Outstanding issues in the theory of radar aurora: Evidence from the frequency dependence of spectral characteristics

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1301m&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A10, pp. SIA 13-1, CiteID 1301, DOI 10.1029/2001JA009218

Physics

Space Physics

7

Ionosphere: Plasma Waves And Instabilities, Ionosphere: Ionospheric Irregularities, Radio Science: Ionospheric Propagation (2487), Ionosphere: Auroral Ionosphere (2704)

Scientific paper

A review of the spectral characteristics of radar aurora with a focus on the behavior over a wide range of frequencies gives a different perspective on several issues concerning auroral backscatter. Some of the conclusions from this study are as follows: (1) It appears most likely (but has certainly not been proven) that auroral backscatter at large geometric magnetic aspect angles has the same general characteristics at all frequencies; VHF observations showing other characteristics are most likely refracted to small aspect angle by sporadic E. (2) The broadest spectra are observed at neither HF or UHF, but at VHF frequencies, but it is unclear whether this is a topic for theoreticians to consider, or if it is an observational effect. (3) The flow angle dependence of sub-ion-acoustic UHF echoes and large aspect angle echoes both present theoretical challenges which remain unaddressed. (4) In spite of several attempts, there appears to be no satisfactory theory of either type 3 or type 4 echoes, especially when the frequency dependence of these echoes is considered.

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