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First in‐situ measurements of HF radar echoing targets
Author(s) -
Moen J.,
Oksavik K.,
Abe T.,
Lester M.,
Saito Y.,
Bekkeng T. A.,
Jacobsen K. S.
Publication year - 2012
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 - 10.1029/2012gl051407
Subject(s) - ionosphere , electron density , sounding rocket , radar , electron precipitation , ionospheric sounding , geophysics , backscatter (email) , cusp (singularity) , instability , physics , geology , electron temperature , plasma , computational physics , geodesy , magnetosphere , astronomy , nuclear physics , aerospace engineering , geometry , telecommunications , mathematics , computer science , mechanics , engineering , wireless
The sounding rocket Investigation of Cusp Irregularities 2 (ICI‐2) was launched into the cusp ionosphere over Svalbard to investigate the production of decameter scale irregularities in the electron plasma associated with HF radar backscatter. The main mission objective was to obtain high‐resolution measurements of decameter scale electron plasma irregularities and to quantify the growth rate for the gradient drift instability (GDI). At the 5.7 kHz sampling rate of the absolute density measurements, ICI‐2 has provided the first documentation in terms of absolute electron density measurements of how 10‐m structures are located on km scale electron density gradients. ICI‐2 traversed a cusp electron density structure created by ongoing soft precipitation. 10‐m scale irregularities were generated at km scale density gradients. The estimated growth time for the GDI process was 10–50 seconds.