Global-Scale Observations of the Equatorial Ionization Anomaly

Abstract
<p>The National Aeronautics and Space Administration Global-scale Observations of the Limb and Disk ultraviolet spectrograph has been imaging the equatorial ionization anomaly (EIA), regions of the ionosphere with enhanced electron density north and south of the magnetic equator, since October 2018. The initial 3 months of observations was during solar minimum conditions, and they included observations in December solstice of unanticipated variability and depleted regions. Depletions are seen on most nights, in contrast to expectations from previous space-based observations. The variety of scales and morphologies also pose challenges to understanding of the EIA. Abrupt changes in the EIA location, which could be related to in situ measurements of large-scale depletion regions, are observed on some nights. Such synoptic-scale disruptions have not been previously identified.</p>
Year of Publication
2019
Journal
Geophysical Research Letters
Volume
46
Number of Pages
9318-9326
Date Published
08/2019
ISSN Number
0094-8276
URL
https://onlinelibrary.wiley.com/doi/abs/10.1029/2019GL084199
DOI
10.1029/2019GL084199