Rapid fluctuations of random nature in auroral optical emissions

Details Rapid fluctuations of random nature in auroral optical emissions Rapid fluctuations of random nature in auroral optical emissions

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44...61h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Jan. 1982, p. 61-69. Research sponsored by the Norges Teknisk-Naturvit

Physics

Auroral Arcs, Auroral Spectroscopy, Luminous Intensity, Optical Emission Spectroscopy, Random Processes, H Beta Line, Nitrogen Ions, Periodic Variations, Power Spectra, Rocket-Borne Instruments

Scientific paper

Rapid intensity fluctuations in the optical emission, N2/+/ (4278 A), H-beta (4861 A), and OI (5577 A) have been observed with rocket-borne photometers during a passage through a homogeneous auroral arc. The measurements indicate that relatively weak (2-5%) intensity fluctuations of random nature, with dominant frequencies in the 2-20 Hz range, do exist in the optical emissions of quiet-form auroras. These variations have well-defined averaged spectral characteristics and apparently differ from the strong quasi-periodic type of variations seen during pulsing auroras. It is argued that the observed fluctuations, which are usually composed of weak short-lived microbursts, reflect the temporal and spatial microstructure which apparently exists always within auroral arcs.

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