Results 11 to 20 of about 6,139 (217)

Seasonal variation of thermospheric density and composition [PDF]

Journal of Geophysical Research: Space Physics, 2009
Thermospheric neutral density and composition exhibit a strong seasonal variation, with maxima near the equinoxes, a primary minimum during northern hemisphere summer, and a secondary minimum during southern hemisphere summer. This pattern of variation is described by thermospheric empirical models. However, the mechanisms are not well understood.
Liying Qian, Stanley C. Solomon, Timothy J. Kane   +2 more
openaire   +3 more sources

Do Migrating Semidiurnal Tidal Winds From the Lower Atmosphere Control Thermospheric Winds?

Geophysical Research Letters
Lower atmospheric tides are important for driving the thermospheric and ionospheric structure. The effects of different lower atmospheric migrating semidiurnal tidal fields of neutral density, temperature, and winds on the thermospheric winds are ...
Chen Wu, Aaron J. Ridley
doaj   +2 more sources

Real‐Time Thermospheric Density Estimation via Two‐Line Element Data Assimilation

Space Weather, 2020
Inaccurate estimates of the thermospheric density are a major source of error in low Earth orbit prediction. Therefore, real‐time density estimation is required to improve orbit prediction.
David J. Gondelach, Richard Linares
doaj   +2 more sources

Thermospheric Conditions Associated With the Loss of 40 Starlink Satellites

Space Weather, 2022
We analyzed far ultraviolet data from Defense Meteorological Satellite Program (DMSP)/Special Sensor Ultraviolet Spectrographic Imager (SSUSI) and Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED)/Global Ultraviolet Imager (GUVI) and ...
Yongliang Zhang, Larry J. Paxton, Robert Schaefer, William H. Swartz   +3 more
doaj   +2 more sources

Impact of Thermospheric Mass Density on the Orbit Prediction of LEO Satellites

Space Weather, 2020
Many thermospheric mass density (TMD) variations have been recognized in observations and physical simulations; however, their impact on the low‐Earth‐orbit satellites has not been fully evaluated.
Changyong He, Yang Yang, Brett Carter, Kefei Zhang, Andong Hu, Wang Li, Florent Deleflie, Robert Norman, Suqin Wu   +8 more
doaj   +2 more sources

Evaluation of Physics‐Based Data Assimilation System Driven by Neutral Density Data From a Single Satellite

Space Weather, 2020
Accurate forecast of the thermospheric density is critical to the space community. The data assimilation approach that is based on the self‐consistent upper‐atmosphere model may provide better predictive capability of the coupled thermosphere system.
Dexin Ren, Jiuhou Lei
doaj   +1 more source

A new method for studying the thermospheric density variability derived from CHAMP/STAR accelerometer data for magnetically active conditions [PDF]

Annales Geophysicae, 2007
Thermospheric densities deduced from STAR accelerometer measurements onboard the CHAMP satellite are used to characterize the thermosphere and its response to space weather events. The STAR thermospheric density estimates are analysed using a Singular
M. Menvielle, M. Menvielle, C. Lathuillère, S. Bruinsma, R. Viereck   +4 more
doaj   +1 more source

Thermospheric Neutral Density Variation During the “SpaceX” Storm: Implications From Physics‐Based Whole Geospace Modeling

Space Weather, 2022
The Starlink satellites launched on 3 February 2022 were lost before they fully arrived in their designated orbits. The loss was attributed to two moderate geomagnetic storms that occurred consecutively on 3–4 February.
Dong Lin, Wenbin Wang, Katherine Garcia‐Sage, Jia Yue, Viacheslav Merkin, Joseph M. McInerney, Kevin Pham, Kareem Sorathia   +7 more
doaj   +1 more source

Using Temporal Relationship of Thermospheric Density With Geomagnetic Activity Indices and Joule Heating as Calibration for NRLMSISE‐00 During Geomagnetic Storms

Space Weather, 2022
The responses of thermospheric densities to geomagnetic activity indices and Joule heating are analyzed during 265 geomagnetic storms and can be used to calibrate the model NRLMSISE‐00 with neutral mass density observed at 400 km based on the CHAMP ...
Xin Wang, Juan Miao, Xian Lu, Ercha Aa, Binxian Luo, Ji Liu, Yu Hong, Yuxian Wang, Tingling Ren, Ruiyun Zeng, Chenxi Du, Siqing Liu   +11 more
doaj   +1 more source

First E region observations of mesoscale neutral wind interaction with auroral arcs [PDF]

, 2010
We report the first observations of E region neutral wind fields and their interaction with auroral arcs at mesoscale spatial resolution during geomagnetically quiet conditions at Mawson, Antarctica.
Aikio, Anderson, Armstrong, Arnoldy, Aruliah, Aruliah, Aruliah, Aruliah, B. A. Carter, Brekke, Burch, C. Anderson, Chisham, Cierpka, Codrescu, Conde, Conde, Conde, Crickmore, Currie, Davies, del Pozo, Deng, Doe, Doe, Egeland, Friis-Christensen, Fuller-Rowell, Galperin, Greenwald, Heelis, Hernandez, Holmes, Iijima, Iijima, Kamide, Killeen, Killeen, Killeen, Kirkwood, Knudsen, Kosch, Kosch, Kosch, Kosch, Kosch, Kosch, Kosch, Kosch, Larsen, Lewis, M. Conde, M. J. Kosch, Makarevich, McCormac, Millward, Nozawa, Opgenoorth, P. L. Dyson, Price, Price, R. A. D. Fiori, R. A. Makarevich, Rees, Rees, Rees, Ruohoniemi, Schlegel, Schunk, Senior, Senior, Senior, Störmer, T. Davies, Thayer, Tsunoda, Vickrey, Wang, Weimer, Wescott, Zmuda   +80 more
core   +1 more source