Simultaneous 6300 Å airglow and radar observations of ionospheric irregularities and dynamics at the geomagnetic equator
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Published:2018-03-22
Issue:2
Volume:36
Page:473-487
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ISSN:1432-0576
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Container-title:Annales Geophysicae
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language:en
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Short-container-title:Ann. Geophys.
Author:
Hickey Dustin A.ORCID, Martinis Carlos R., Mendillo Michael, Baumgardner Jeffrey, Wroten Joei, Milla MarcoORCID
Abstract
Abstract. In March 2014 an all-sky imager (ASI) was installed at the Jicamarca Radio
Observatory (11.95∘ S, 76.87∘ W; 0.3∘ S MLAT). We
present results of equatorial spread F (ESF) characteristics observed at
Jicamarca and at low latitudes. Optical 6300 and 7774 Å airglow
observations from the Jicamarca ASI are compared with other collocated
instruments and with ASIs at El Leoncito, Argentina (31.8∘ S,
69.3∘ W; 19.8∘ S MLAT), and Villa de Leyva, Colombia
(5.6∘ N, 73.52∘ W; 16.4∘ N MLAT). We use Jicamarca
radar data, in incoherent and coherent modes, to obtain plasma parameters and
detect echoes from irregularities. We find that ESF depletions tend to appear
in groups with a group-to-group separation around 400–500 km and
within-group separation around 50–100 km. We combine data from the three
ASIs to investigate the conditions at Jicamarca that could lead to the
development of high-altitude, or topside, plumes. We compare zonal winds,
obtained from a Fabry–Pérot interferometer, with plasma drifts inferred
from the zonal motion of plasma depletions. In addition to the ESF studies we
also investigate the midnight temperature maximum and its effects at higher
latitudes, visible as a brightness wave at El Leoncito. The ASI at Jicamarca
along with collocated and low-latitude instruments provide a clear
two-dimensional view of spatial and temporal evolution of ionospheric
phenomena at equatorial and low latitudes that helps to explain the dynamics
and evolution of equatorial ionospheric/thermospheric processes. Keywords. Ionosphere (equatorial ionosphere; ionospheric irregularities; plasma temperature and density)
Funder
Division of Atmospheric and Geospace Sciences Office of Naval Research Global
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
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