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Ann. Geophys., 23, 201-205, 2005
www.ann-geophys.net/23/201/2005/
© European Geosciences Union 2005
Meteor head echoes - observations and models
A. Pellinen-Wannberg
Swedish Institute of Space Physics, Box 812, S-981 28 Kiruna, Sweden
Abstract. Meteor head echoes - instantaneous echoes moving with the velocities of the
meteors - have been recorded since 1947. Despite many attempts, this
phenomenon did not receive a comprehensive theory for over 4 decades. The High
Power and Large Aperture (HPLA) features, combined with present signal
processing and data storage capabilities of incoherent scatter radars, may
give an explanation for the old riddle. The meteoroid passage through the
radar beam can be followed with simultaneous spatial-time resolution of
about 100m-ms class. The current views of the meteor head echo process will
be presented and discussed. These will be related to various EISCAT
observations, such as dual-frequency target sizes, altitude distributions
and vector velocities.
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