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Thermospheric density enhancement and limb O 130.4 nm radiance increase during geomagnetic storms
We explore a connection between thermospheric density enhancement and increase in thermospheric O 130.4 nm radiance. We observe TIMED/GUVI enhancements in the limb 130.4 nm radiances at ∼400 and ∼520 km on the dayside during four intense geomagnetic storms in 2003 and 2004. The enhancements were well correlated with Dst and CHAMP total neutral density at 400 km which represents O density as O is the dominant species at those altitudes. At the 400 and 520 km altitudes, O 130.4 nm emissions are mostly created by two ...
Zhang, Yongliang; Paxton, Larry; Schaefer, R.;
Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: mar
YEAR: 2022   DOI: 10.1016/j.jastp.2022.105830
FUV emission; Geomagentic storms; neutral density; thermosphere
Quantification of the role of gravity wave induced TIDs in modulating ESF day to day variability during geomagnetically disturbed periods
The control of magnetic disturbance induced seed perturbations on the daily variation in night-time ionization irregularity occurrence is studied using ionosonde data and TIMED/GUVI neutral density data at the magnetic equatorial region, Trivandrum. The study reveals that there is a requisite threshold seed amplitude for ESF to occur at a particular altitude and this requisite seed increases as the altitude decreases. This dependence of requisite seed perturbation on altitude for multiple years, which incorporates the electr ...
Published by: Advances in Space Research Published on: mar
YEAR: 2022   DOI: 10.1016/j.asr.2021.11.038
Equatorial ionosphere; Equatorial Spread F; Geomagnetically disturbed period; neutral density
Seasonal variability in global eddy diffusion and the effect on neutral density
We describe a method for making single-satellite estimates of the seasonal variability in global-average eddy diffusion coefficients. Eddy diffusion values as a function of time were estimated from residuals of neutral density measurements made by the Challenging Minisatellite Payload (CHAMP) and simulations made using the thermosphere-ionosphere-mesosphere electrodynamics global circulation model (TIME-GCM). The eddy diffusion coefficient results are quantitatively consistent with previous estimates based on satellite dr ...
Published by: Journal of Geophysical Research: Space Physics Published on: 04/2015
YEAR: 2015   DOI: 10.1002/2015JA021084
annual; eddy diffusion; neutral density; satellite drag; seasonal variability; semiannual