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Imaging HF‐induced large‐scale irregularities above HAARP
Author(s) -
Djuth Frank T.,
Reinisch Bodo W.,
Kitrosser David F.,
Elder John H.,
Snyder A. Lee,
Sales Gary S.
Publication year - 2006
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 - 10.1029/2005gl024536
Subject(s) - earth's magnetic field , ionosphere , zenith , geophysics , geology , beam (structure) , scale (ratio) , magnetic field , physics , geodesy , optics , quantum mechanics
The University of Massachusetts‐Lowell digisonde is used with the HAARP high‐frequency (HF), ionospheric modification facility to obtain radio images of artificially‐produced, large‐scale, geomagnetic field‐aligned irregularities. F region irregularities generated with the HAARP beam pointed in the vertical and geomagnetic field‐aligned directions are examined in a smooth background plasma. It is found that limited large‐scale irregularity production takes place with vertical transmissions, whereas there is a dramatic increase in the number of source irregularities with the beam pointed parallel to the geomagnetic field. Strong irregularity production appears to be confined to within ∼5° of the geomagnetic zenith and does not fill the volume occupied by the HF beam. A similar effect is observed in optical images of artificial airglow.