EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Haldoupis et al. 1993
Haldoupis, C., Koehler, J.A., Sofko, G.J., Danskin, D.W., McKibben, M.J. and André, D. (1993). Preferential phase velocities for type 4 irregularities in the auroral E region plasma. Journal of Geophysical Research 98: doi: 10.1029/92JA02652. issn: 0148-0227.

This paper presents additional evidence on the nature of 50-MHz type 4 auroral backscatter. By using a large number of events, recorded during several periods of continous wave Doppler radar operation in the past few years, and a data sequence of long lasting type 4 echoes, the mean phase velocity of type 4 waves and its relation to type 1 phase velocity have been studied statistically. On the average, type 4 phase velocities range between 800 and 1200 m/s with the great majority grouping near 1000 m/s. The mean velocities of simultaneous type 4 and type 1 spectrum components are well separated in the Doppler shift range with an approximate factor of 2 in the type 4 to type 1 velocity ratio. Also, both spectrum components have the same Doppler polarity, which is indicative of a direct or indirect role for the electric field in type 4 wave generation. On the basis of the widely accepted conviction that type 1 waves have velocities saturating near the ion acoustic speed, it is concluded that type 4 waves propagate with velocities at about twice the acoustic speed in the plasma. The evidence presented here strongly suggests that type 4 waves propagate at preferential velocities near 1000 m/s, an experimental fact which must be explained in theoretical models. ¿American Geophysical Union 1993

BACKGROUND DATA FILES

Abstract

Keywords
Ionosphere, Auroral ionosphere, Ionosphere, Ionospheric irregularities, Ionosphere, Plasma waves and instabilities, Ionosphere, Electric fields and currents
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit