TitleIon-neutral coupling during deep solar minimum
Publication TypeJournal Article
Year of Publication2013
AuthorsHuang, CY, Roddy, PA, Sutton, EK, Stoneback, R, Pfaff, RF, Gentile, LC, Delay, SH
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume103
Pagination138 - 146
Date Published10/2013
ISSN13646826
KeywordsEquatorial ionosphere; Nonmigrating tides; Plasma depletions; Thermosphere
Abstract

The equatorial ionosphere under conditions of deep solar minimum exhibits structuring due to tidal forces. Data from instruments carried by the Communication/Navigation Outage Forecasting System (C/NOFS) which was launched in April 2008 have been analyzed for the first 2 years following launch. The Planar Langmuir Probe (PLP), Ion Velocity Meter (IVM) and Vector Electric Field Investigation (VEFI) all detect periodic structures during the 2008–2010 period which appear to be tides. However when the tidal features detected by these instruments are compared, there are distinctive and significant differences between the observations. Tides in neutral densities measured by the Gravity Recovery and Climate Experiment (GRACE) satellite were also observed during June 2008. In addition, Broad Plasma Decreases (BPDs) appear as a deep absolute minimum in the plasma and neutral density tidal pattern. These are co-located with regions of large downward-directed ion meridional velocities and minima in the zonal drifts, all on the nightside. The region in which BPDs occur coincides with a peak in occurrence rate of dawn depletions in plasma density observed on the Defense Meterological Satellite Program (DMSP) spacecraft, as well as a minimum in radiance detected by UV imagers on the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) and IMAGE satellites.

URLhttp://linkinghub.elsevier.com/retrieve/pii/S1364682612002829
DOI10.1016/j.jastp.2012.11.009
Short TitleJournal of Atmospheric and Solar-Terrestrial Physics


Page Last Modified: December 4, 2014