Accession Number:

ADA101729

Title:

Doppler Spectral Characteristics of High Latitude Ionospheric Irregularities: Effect on HF Radars.

Descriptive Note:

Final technical rept. 23 Apr-30 Sep 80,

Corporate Author:

JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1981-05-01

Pagination or Media Count:

142.0

Abstract:

This report considers the Doppler spectral properties of radar signals scattered from high latitude E and F-region ionospheric irregularities. Although the exact mechanism for the production of F-region irregularities is not yet known, it appears that the Doppler shift from these as well as from E-region irregularities is determined by the ionospheric electric field via the E X BB-squared drift velocity. The width of the backscattered spectra is determined by the viewing angle of the radar relative to the E X BB-squared drift direction as well as the drift magnitude. Assuming an electrical potential distribution over the Earths high latitude regions, it has been possible to predict the diurnal variability of the Doppler velocity and width associated with high latitude irregularities. Although some of these predictions agree with previous observations, considerably more knowledge is required of the high latitude potential distribution and its temporal variability. Finally, a novel new technique is proposed whereby through cross spectral analysis the detrimental effects of clutter due to ionospheric irregularities may be eliminated. Author

Subject Categories:

  • Cybernetics
  • Active and Passive Radar Detection and Equipment
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE