Results 31 to 40 of about 1,392 (166)

Case study of the mesospheric and lower thermospheric effects of solar x-ray flares: Coupled ion-neutral modelling and comparison with EISCAT and riometer measurements [PDF]

, 2008
Two case studies of upper mesospheric and lower thermospheric (UMLT) high-latitude effects of solar X-ray flares are presented. Sodankylä Ion-neutral Chemistry Model (SIC) electron density profiles agree with D-region EISCAT and riometer ...
Beharrell, M.J., A. Seppälä, Verronen, P.T., Seppälä, A., Ulich, T., C.-F. Enell, Enell, C.-F., Honary, F., P. T. Verronen, J. P. Vierinen, T. Ulich, A. Kero, E. Turunen, M. J. Beharrell, Vierinen, J.P., Turunen, E., F. Honary, Kero, A.   +17 more
core   +1 more source

Recent progress on the retrieval and modeling of thermosphere mass density

地球与行星物理论评, 2023
The thermosphere is the atmospheric layer extending from about 90 km to nearly 1000 kilometers, which is an important interreaction area between the Sun and the Earth.
Jiuhou Lei, Ruoxi Li, Dexin Ren, Libin Weng, Haibing Ruan   +4 more
doaj   +1 more source

Mesoscale observations of Joule heating near an auroral arc and ion-neutral collision frequency in the polar cap E region [PDF]

, 2011
We report on the first mesoscale combined ionospheric and thermospheric observations, partly in the vicinity of an auroral arc, from Svalbard in the polar cap on 2 February 2010. The EISCAT Svalbard radar employed a novel scanning mode in order to obtain
Wild, J.A., Yiu, I., Kosch, M.J., Anderson, C., I. Yiu, Y. Ogawa, Aruliah, A., Tsuda, T., I. W. McCrea, L. J. Baddeley, S. Nozawa, Howells, V., A. Aruliah, J. A. Wild, McCrea, I.W., V. Howells, Ogawa, Y., Nozawa, S., M. J. Kosch, C. Anderson, Baddeley, L.J., T. Tsuda   +21 more
core   +1 more source

Further evidence of the long-term thermospheric density variation using 1U CubeSats [PDF]

, 2022
Faculty members, undergraduate and graduate students of the School of Communication and Aerospace Engineering (Polytechnical University of Catalonia) are participating in a series of studies to determine the thermospheric density.
Gutiérrez Cabello, Jordi, Martínez, Adrián, Gil Pons, Pilar, Jordi Gutiérrez Cabello, Pilar Gil Pons, Lledó Ardila, Carlos, Adrián Martínez, Carlos Lledó Ardila   +7 more
core   +1 more source

Investigation of energy transport and thermospheric upwelling during quiet magnetospheric and ionospheric conditions from the studies of low- and middle-altitude cusp [PDF]

Annales Geophysicae, 2015
We investigate energy fluxes and small, kilometre-scale Birkeland currents in the magnetospheric cusp at a 1–3 Earth radii altitude and in the ionosphere using satellites when they were, according to the Tsyganenko model, in magnetic conjunction ...
T. Živković, T. Živković, S. Buchert, P. Ritter, L. Palin, H. Opgenoorth   +5 more
doaj   +1 more source

Atomic nitrogen densities in the thermosphere

Geophysical Research Letters, 1976
Recently atomic nitrogen densities of ∼106cm−3 were measured at 400 km by the open source mass spectrometer on the Atmosphere Explorer‐C satellite (AE‐C). Daytime N densities ∼5 × 107cm−3 at 160 km have also been inferred from airglow and other measurements on AE‐C.
D. G. Torr, M. R. Torr, D. W. Rusch, P. B. Hays, K. Mauersberger, J. C. G. Walker, N. W. Spencer, A. E. Hedin, H. C. Brinton, R. F. Theis   +9 more
openaire   +1 more source

Thermospheric density perturbations in response to substorms [PDF]

Journal of Geophysical Research: Space Physics, 2014
AbstractWe use 5 years (2001–2005) of CHAMP (Challenging Minisatellite Payload) satellite data to study average spatial and temporal mass density perturbations caused by magnetospheric substorms in the thermosphere. Using statistics from 2306 substorms to construct superposed epoch time series, we find that the largest average increase in mass density ...
Clausen, L. B. N., Milan, S. E., Grocott, Adrian   +2 more
openaire   +3 more sources

Temperature enhancements and vertical winds in the lower thermosphere associated with auroral heating during the DELTA campaign [PDF]

, 2009
A coordinated observation of the atmospheric response to auroral energy input in the polar lower thermosphere was conducted during the Dynamics and Energetics of the Lower Thermosphere in Aurora (DELTA) campaign.
Kurihara, J., Abe, T., Y. Ogawa, Oyama, K.-I., S. Oyama, S. Nozawa, T. T. Tsuda, T. Abe, Nozawa, S., Griffin, E., N. Iwagami, H. Miyaoka, E. Griffin, R. Fujii, Tsuda, T. T., K.-I. Oyama, Kauristie, K., Kosch, Mike J., Aruliah, A., Iwagami, N., J. Kurihara, A. Aruliah, Oyama, S., Miyaoka, H., Ogawa, Y., Fujii, R., M. J. Kosch, K. Kauristie   +27 more
core   +1 more source

Drag Coefficient Constraints for Space Weather Observations in the Upper Thermosphere

Space Weather, 2022
The space weather research community relies heavily on thermospheric density data to understand long‐term thermospheric variability, construct assimilative, empirical, and semiempirical global atmospheric models and validate model performance. One of the
Valerie Bernstein, Marcin Pilinski
doaj   +1 more source

Thermospheric Temperature and Density Variability During 3–4 February 2022 Minor Geomagnetic Storm

Space Weather, 2023
Themospheric conditions during a minor geomagnetic event of 3 and 4 February 2022 has been investigated using disk temperature (Tdisk) observations from Global‐scale Observations of the Limb and Disk (GOLD) mission and model simulations.
F. I. Laskar, E. K. Sutton, D. Lin, K. R. Greer, S. Aryal, X. Cai, N. M. Pedatella, R. W. Eastes, W. Wang, M. V. Codrescu, W. E. McClintock   +10 more
doaj   +1 more source