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Concurrent observations at the magnetic equator of small-scale irregularities and large-scale depletions associated with equatorial spread F | | D. A. Hickey
; C. R. Martinis
; F. S. Rodrigues
; R. H. Varney
; M. A. Milla
; M. J. Nicolls
; Anja Strømme
; J. F. Arratia
; | | Date: |
19 Nov 2015 | | Abstract: | In 2014 an all-sky imager (ASI) and an Advanced Modular Incoherent Scatter
Radar consisting of 14 panels (AMISR-14) system were installed at the Jicamarca
Radio Observatory. The ASI measures airglow depletions associated with
large-scale equatorial spread F irregularities (10s-100s km), while AMISR-14
detects small-scale irregularities (0.34 m). This study presents simultaneous
observations of equatorial spread F (ESF) irregularities at 10-100 km scales
using the all sky-imager, at 3 m scales using the JULIA (Jicamarca Unattended
Long-term Investigations of the Ionosphere and Atmosphere) radar, and at 0.34 m
scales using the AMISR-14 radar. We compare data from the three instruments on
the night of 20-21 August, 2014 by locating the radar scattering volume in the
optical images. During this night no topside plumes were observed, and we only
compare with bottomside ESF. AMISR-14 had five beams perpendicular to the
magnetic field covering ~200 km in the east-west direction at 250 km altitude.
Comparing the radar data with zenith ASI measurements, we found that most of
the echoes occur on the western wall of the depletions with fewer echoes
observed the eastern wall and center, contrary to previous comparisons of
topside plumes that showed most of the echoes in the center of depleted
regions. We attribute these differences to the occurrence of irregularities
produced at sub-meter scales by the lower-hybrid-drift instability. Comparisons
of the ASI observations with JULIA images show similar results to those found
in the AMISR-14 and ASI comparison. | | Source: | arXiv, 1511.6041 | | Services: | Forum | Review | PDF | Favorites | |
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