Results 21 to 30 of about 5,042,325 (288)

Dynamics of the upper atmosphere

Atmospheric Environment (1967), 1982
The earth's upper atmosphere is highly dynamic, receiving strong energy inputs both from below in the form of upward propagating waves and from above in the form of electromagnetic and particle radiation from the sun and magnetosphere. Above 100 km the dynamics become increasingly influenced by factors that are of minor importance in the lower ...
openaire   +2 more sources

Investigating the role of gravity waves in mesosphere and lower-thermosphere (MLT) inversions at low latitudes [PDF]

Annales Geophysicae
The mesosphere and lower-thermosphere (MLT) transitional region, encompassing a height range of 60–100 km, is a distinct and highly turbulent zone within Earth's atmosphere.
C. Lingerew, U. J. P. Raju
doaj   +1 more source

Propagation Properties of Sunspots Umbral Oscillations in Horizontal and Vertical Directions

The Astrophysical Journal, 2023
We present a study on investigating the propagation characteristics of umbral oscillations in sunspots. In sunspot 1 (located in NOAA AR 12127) with four umbrae, the analysis shows that the oscillations in different umbrae are correlated.
Wei Wu, Jiang-tao Su, Jie Chen, Xiao-shuai Zhu, Robert Sych   +4 more
doaj   +1 more source

Sensitivity of the 4–10-Day Planetary Wave Structures in the Middle Atmosphere to the Solar Activity Effects in the Thermosphere

, 2022
Numerical simulation of the general atmospheric circulation was performed to estimate changes in amplitudes of the westward-travelling planetary waves (PWs) at altitudes from the Earth’s surface up to 300 km under different solar activity (SA ...
Elena N. Savenkova, Ksenia A. Didenko, Andrey V. Koval, Tatiana S. Ermakova, Nikolai M. Gavrilov   +4 more
core   +1 more source

Analysis of the cooling episode in Western Romania in the first half of April 2025 using upper troposphere maps [PDF]

Journal of Central European Agriculture
The first decade of April was characterised by particularly cold weather with minimum temperatures that were daily or even monthly records. The cooling of the weather occurred starting on April 6 and lasted until after April 10, producing late frost with
Vlad MIRCOV, Anca NICHITA, Veronica SĂRĂȚEANU, Daniela POȘTA, Otilia COTUNA, Călin SĂLCEANU, Mirela PARASCHIVU   +6 more
doaj   +1 more source

Numerical modeling of solar wind influences on the dynamics of the high-latitude upper atmosphere [PDF]

Advances in Radio Science, 2012
Neutral thermospheric wind patterns at high latitudes obtained from cross-track acceleration measurements of the CHAMP satellite above both polar regions are used to deduce statistical neutral wind vorticity distributions and were analyzed in their ...
M. Förster, B. E. Prokhorov, A. A. Namgaladze, M. Holschneider   +3 more
doaj   +1 more source

Dynamical heating of the upper atmosphere [PDF]

Journal of Geophysical Research, 1965
Dynamical heating rates of ionosphere - energy of upward propagating atmospheric gravity ...
openaire   +1 more source

Thermospheric atomic oxygen density estimates using the EISCAT Svalbard Radar [PDF]

, 2013
[1] Coupling between the ionized and neutral atmosphere through particle collisions allows an indirect study of the neutral atmosphere through measurements of ionospheric plasma parameters. We estimate the neutral density of the upper thermosphere above ~
Sutton, E., La Hoz, C., E. Sutton, C. La Hoz, H. Vickers, Ogawa, Y., Y. Ogawa, Vickers, Hannah, Kosch, M. J., M. J. Kosch, Vickers, H., La Hoz, Cesar   +11 more
core   +5 more sources

A dynamic upper atmosphere of Venus as revealed by VIRTIS on Venus Express [PDF]

Nature, 2007
The upper atmosphere of a planet is a transition region in which energy is transferred between the deeper atmosphere and outer space. Molecular emissions from the upper atmosphere (90-120 km altitude) of Venus can be used to investigate the energetics and to trace the circulation of this hitherto little-studied region.
Drossart, P, Piccioni, G., Gérard, J. C., Lopez Valverde, M. A., Sanchez Lavega, A., Zasova, L., Hueso, R., Taylor, F. W., Bézard, B., Adriani, A., ANGRILLI, FRANCESCO, Arnold, G., Baines, K. H., Bellucci, G., Benkhoff, J., Bibring, J. P., Blanco, A., Blecka, M. I., Carlson, R. W., Coradini, A., Di Lellis, A., Encrenaz, T., Erard, S., Fonti, S., Formisano, V., Fouchet, T., Garcia, R., Haus, R., Helbert, J., Ignatiev, N. I., Irwin, P., Langevin, Y., Lebonnois, S., Luz, D., Marinangeli, L., Orofino, V., Rodin, A. V., Roos Serote, M. C., SAGGIN, BORTOLINO, Stam, D. M., Titov, D., Visconti, G., Zambelli, M., Tsang, C., Ammannito, Eleonora, Barbis, Alessandra, Berlin, Rainer, BETTANINI FECIA DI COSSATO, CARLO, Boccaccini, Angelo, Bonnello, Guillaume, Bouyé, Marc, Capaccioni, Fabrizio, Cardesin, Alejandro, Carraro, Francesco, Cherubini, Giovanni, Cosi, Massimo, Dami, Michele, De Nino, Maurizio, Del Vento, Davide, Di Giampietro, Marco, Donati, Alessandro, Dupuis, Olivier, Espinasse, Sylvie, Fabbri, Anna, Fave, Agnès, Ficai Veltroni, Iacopo, Filacchione, Gianrico, Garceran, Katia, Ghomchi, Yamina, Giustizi, Maurizio, Gondet, Brigitte, Hello, Yann, Henry, Florence, Hofer, Stefan, Huntzinger, Gerard, Kachlicki, Juergen, Knoll, René, Kouach, Driss, Mazzoni, Alessandro, Melchiorri, Riccardo, Mondello, Giuseppe, Monti, Francesco, Neumann, Christian, Nuccilli, Fabrizio, Parisot, Jérôme, Pasqui, Claudio, Perferi, Stefano, Peter, Gisbert, Piacentino, Alain, Pompei, Carlo, Réess, Jean Michel, Rivet, Jean Pierre, Romano, Antonio, Russ, Natalie, Santoni, Massimo, Scarpelli, Adelmo, Sémery, Alain, Soufflot, Alain, Stefanovitch, Douchane, Suetta, Enrico, Tarchi, Fabio, Tonetti, Nazzareno, Tosi, Federico, Ulmer, Bernd   +103 more
openaire   +11 more sources

Nonlinear forcing mechanisms of the migrating terdiurnal solar tide and their impact on the zonal mean circulation [PDF]

Annales Geophysicae, 2019
We investigate the forcing mechanisms of the terdiurnal solar tide in the middle atmosphere using a mechanistic global circulation model. In order to quantify their individual contributions, we perform several model experiments and separate each forcing ...
F. Lilienthal, C. Jacobi
doaj   +1 more source