Early Morning Equatorial Ionization Anomaly From GOLD Observations
Name
JGR Space Physics - 2020 - Laskar - Early Morning Equatorial Ionization Anomaly From GOLD Observations.pdf
Description
Published version
Size
17.68 MB
Format
Adobe PDF
Checksum (MD5)
89800bae80c2542879722dee6e4b27ef
Author(s)
Laskar, FI
Eastes, RW
Martinis, CR
Daniell, RE
Pedatella, NM
Burns, AG
McClintock, W
Goncharenko, LP
Coster, A
Milla, MA
Date Issued
May 21, 2020
Journal
Journal of Geophysical Research: Space Physics
Publisher
American Geophysical Union
Citation
Laskar, F. I., Eastes, R. W., Martinis, C. R., Daniell, R. E., Pedatella, N. M., Burns, A. G., et al. (2020). Early morning equatorial ionization anomaly from GOLD observations. Journal of Geophysical Research: Space Physics, 125, e2019JA027487.
Version
Final published version
Abstract
During geomagnetically quiet and solar minimum conditions, spatial variations of the early morning thermosphere‐ionosphere (TI) system are expected to be mainly governed by wave dynamics. To study the postmidnight dynamical coupling, we investigated the early morning equatorial ionization anomaly (EIA) using Global‐scale Observations of the Limb and Disk (GOLD) measurements of OI‐135.6 nm nightglow emission and global navigation satellite system (GNSS)‐based total electron content (TEC) maps. The EIA structures in the OI‐135.6 nm emission over the American landmass resemble, spatially and temporally, those observed in the GNSS‐TEC maps. The early morning EIA (EM‐EIA) crests are well separated in latitude and mostly located over the middle of South America during October–November. In February–April the crests are less separated in latitude and predominantly located over the west coast sector of South America. Whole Atmosphere Community Climate Model with thermosphere and ionosphere eXtension (WACCMX) simulations with constant solar minimum and quiet‐geomagnetic conditions show that EM‐EIA can occur globally and shows properties similar to longitudinal Wave 4 pattern. Thus, we propose that EM‐EIA is driven by dynamical changes associated with the lower atmospheric waves.
MIT Department
Haystack Observatory
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2019JA027487
