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First observations of type‐1 sporadic E Irregularities in the equatorial anomaly region using the Chung‐Li VHF radar
Author(s) -
Huang ChienMing,
Chu YenHsyang
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1998gl900024
Subject(s) - geology , radar , geodesy , sporadic e propagation , doppler effect , anomaly (physics) , doppler radar , interferometry , latitude , geophysics , physics , ionosphere , optics , astronomy , telecommunications , condensed matter physics , computer science
In this paper we present the characteristics of mid‐latitude irregularities first observed with the 52 MHz Chung‐Li radar. Intense type‐1 echoes with Doppler velocities of about 270 m/s (slightly smaller than the nominal ion‐acoustic wave speed of 360 m/s) in the height range from 103.1 km to 104.5 km lasted for about 2 minutes. The range‐time variations of sequential power spectra indicate that the patch of type‐1 irregularities moved toward the radar at a rate of about 42 m/s. The zonal drift motions of the type‐1 and type‐2 irregularities obtained from an interferometry technique showed that the irregularities drifted eastward with an average speed of 84 m/s.