Results 41 to 50 of about 1,392 (166)

In situ and ground-based intercalibration measurements of plasma density at l = 2.5 [PDF]

, 2003
[1] Two independent ground-based experiments and two satellite-borne experiments are used to interpret the changes in plasmaspheric composition at the same point in space during moderate geomagnetic activity on 22 January and 14 February 2001.
Bailey, G.J., Menk, F.W., Mann, I.R., Rose, M.C., Wilford, C.R., Milinevski, G., Reinisch, B.W., Thomson, N.R., Goldstein, J., Clilverd, M.A., Yearby, K.H., Carpenter, D.L., Sandel, B.R.   +12 more
core   +1 more source

Thermospheric Parameters during Ionospheric G-Conditions

Remote Sensing, 2021
For the first time thermospheric parameters (neutral composition, exospheric temperature and vertical plasma drift related to thermospheric winds) have been inferred for ionospheric G-conditions observed with Millstone Hill ISR on 11–13 September 2005 ...
Loredana Perrone, Andrey V. Mikhailov, Dario Sabbagh   +2 more
doaj   +1 more source

A Simple Method for Correcting Empirical Model Densities During Geomagnetic Storms Using Satellite Orbit Data

Space Weather, 2020
Empirical models of the thermospheric density are routinely used to perform orbit maintenance, satellite collision avoidance, and estimate time and location of re‐entry for spacecraft.
Daniel A. Brandt, Charles D. Bussy‐Virat, Aaron J. Ridley   +2 more
doaj   +1 more source

Further evidence of long-term thermospheric density change using a new method of satellite ballistic coefficient estimation

, 2011
Building on work from previous studies a strong case is presented for the existence of a long-term density decline in the thermosphere. Using a specially developed orbital propagator to predict satellite orbit evolution, combined with a new and accurate ...
Lewis, H.G., Arrun Saunders, Swinerd, G.G., Graham Swinerd, Saunders, A., Hugh Lewis   +5 more
core   +1 more source

Scale Factors of the Thermospheric Density: A Comparison of Satellite Laser Ranging and Accelerometer Solutions

, 2021
A major problem in the precise orbit determination (POD) of satellites at altitudes below 1,000 km is the modeling of the aerodynamic drag which mainly depends on the thermospheric density and causes the largest non‐gravitational acceleration. Typically,
Rudenko, Sergei, Corbin, Armin, Vielberg, Kristin; 2 Institute of Geodesy and Geoinformation University of Bonn Bonn Germany, Schmidt, Michael; 1 Deutsches Geodätisches Forschungsinstitut Technische Universität München Munich Germany, Vielberg, Kristin, Kusche, Jürgen; 2 Institute of Geodesy and Geoinformation University of Bonn Bonn Germany, Schmidt, Michael, Löcher, Anno, Bloßfeld, Mathis, Zeitler, Lea, Löcher, Anno; 2 Institute of Geodesy and Geoinformation University of Bonn Bonn Germany, Rudenko, Sergei; 1 Deutsches Geodätisches Forschungsinstitut Technische Universität München Munich Germany, Corbin, Armin; 2 Institute of Geodesy and Geoinformation University of Bonn Bonn Germany, Kusche, Jürgen, Bloßfeld, Mathis; 1 Deutsches Geodätisches Forschungsinstitut Technische Universität München Munich Germany   +14 more
core   +1 more source

Data assimilation of thermospheric mass density

Space Weather, 2012
Accurate modeling of thermospheric mass density variation is of foremost importance to low Earth orbital prediction. The accuracy of empirical neutral density models based on global indices for solar and geomagnetic activity is inherently limited by the resolution of these indices.
Matsuo, T., Fedrizzi, M., Fuller-Rowell, T., Codrescu, M.   +3 more
openaire   +3 more sources

Thermospheric Density Response to the Solar Activity and QBO

, 2023
In this study, we discuss the thermospheric density response to the solar activity and QBO. By using the wavelet power spectrum method, the thermospheric density from 1967 to 2013 shows ~11-year period, semiannual and annual variations, while the seasonal variation is usually more significant under high solar activity conditions.
Bo Li, Ruifei Cui, Libin Weng, Jianfang Fei   +3 more
openaire   +2 more sources

First Lidar Observations of Ionosphere‐Thermosphere‐Mesosphere (ITM) Na Transition Layer (∼120–95 km): Regular Occurrence Over Boulder (40.13°N, 105.24°W) and Possible Formation Mechanisms

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Using lidar observations of 12 monthly composites of normalized Na density ratios, we have discovered an Ionosphere‐Thermosphere‐Mesosphere (ITM) Na transition layer from ∼120 to ∼95 km over Boulder, Colorado. The transition layer occurs regularly in all months with a distinct separation from the predawn TINa layer and exhibits coherent ...
Yingfei Chen, Xinzhao Chu
wiley   +1 more source

NRLMSIS 2.0: A Whole‐Atmosphere Empirical Model of Temperature and Neutral Species Densities

Earth and Space Science, 2021
NRLMSIS® 2.0 is an empirical atmospheric model that extends from the ground to the exobase and describes the average observed behavior of temperature, eight species densities, and mass density via a parametric analytic formulation.
J. T. Emmert, D. P. Drob, J. M. Picone, D. E. Siskind, M. Jones Jr., M. G. Mlynczak, P. F. Bernath, X. Chu, E. Doornbos, B. Funke, L. P. Goncharenko, M. E. Hervig, M. J. Schwartz, P. E. Sheese, F. Vargas, B. P. Williams, T. Yuan   +16 more
doaj   +1 more source

Seasonal Transitions in the Thermosphere Inferred from Ionospheric Observations

Remote Sensing, 2023
Ionospheric observations along with CHAMP/STAR neutral gas density measurements were used to retrieve thermospheric parameters and to check whether the equinox transition season exists separately from the December solstice and June solstice seasons ...
Loredana Perrone, Andrey V. Mikhailov
doaj   +1 more source