Results 91 to 100 of about 19,021 (226)

Heating efficiency in hydrogen-dominated upper atmospheres

, 2014
Context. The heating efficiency is defined as the ratio of the net local gas-heating rate to the rate of stellar radiative energy absorption. It plays an important role in thermal-escape processes from the upper atmospheres of planets that are exposed to
Ionov, Dmitry E., Lammer, Helmut, Shematovich, Valery I.   +2 more
core   +1 more source

Detection of wave activity in measurements of thermospheric vertical winds and temperatures at subauroral latitudes

Frontiers in Astronomy and Space Sciences
The need for high precision measurements of vertical winds with uncertainties on the scale of 3–5 m s−1 and a temporal cadence of 1–2 min to achieve detection of gravity wave (GW) structure has made it exceedingly difficult to study the response of the ...
Anneliese L. Schmidt, John W. Meriwether, Matthew B. Cooper, Andrew J. Gerrard, Lindsay V. Goodwin, Shun-Rong Zhang, Ying Ye   +6 more
doaj   +1 more source

Energy-limited escape revised

, 2015
Gas planets in close proximity to their host stars experience photoevaporative mass loss. The energy-limited escape concept is generally used to derive estimates for the planetary mass-loss rates.
Czesla, S., Salz, M., Schmitt, J. H. M. M., Schneider, P. C.   +3 more
core   +1 more source

Seasonal and Altitude Dependence of Thermospheric Metastable Helium Densities Measured by Fluorescence Lidar

Geophysical Research Letters
Airglow originating from metastable helium He(23S) at 1,083 nm has been used to study the upper thermosphere since its discovery in 1959, yielding insights into, for example, solar EUV intensities and thermospheric photoelectron densities.
C. Geach, B. Kaifler
doaj   +1 more source

Whole Atmosphere Simulation of Anthropogenic Climate Change

Geophysical Research Letters, 2018
We simulated anthropogenic global change through the entire atmosphere, including the thermosphere and ionosphere, using the Whole Atmosphere Community Climate Model‐eXtended.
Stanley C. Solomon, Han‐Li Liu, Daniel R. Marsh, Joseph M. McInerney, Liying Qian, Francis M. Vitt   +5 more
doaj   +1 more source

Report from upper atmospheric science [PDF]

Most of the understanding of the thermosphere resulted from the analysis of data accrued through the Atmosphere Explorer satellites, the Dynamics Explorer 2 satellite, and observations from rockets, balloons, and ground based instruments.
Carignan, G. R., Hudson, R. D., Mende, S. B., Nagy, A. F., Roble, R. G.   +4 more
core   +1 more source

Laboratory Investigations of Titan Haze Formation: In Situ Measurement of Gas and Particle Composition

, 2017
Prior to the arrival of Cassini-Huygens, aerosol production in Titan's atmosphere was believed to begin in the stratosphere where chemical processes are predominantly initiated by FUV radiation.
de Gouw, Joost A., Horst, Sarah M., Li, Rui, Parker, Alex H., Tolbert, Margaret A., Ugelow, Melissa S., Yoon, Y. Heidi   +6 more
core   +1 more source

GOLD Observations of the Thermospheric Response to the 10–12 May 2024 Gannon Superstorm

Geophysical Research Letters
After days of intense solar activity, active region AR3664 launched seven CMEs toward Earth producing an extreme G5 geomagnetic storm commencing at 17:05 UT on 10 May 2024.
J. S. Evans, J. Correira, J. D. Lumpe, R. W. Eastes, Q. Gan, F. I. Laskar, S. Aryal, W. Wang, A. G. Burns, S. Beland, X. Cai, M. Codrescu, S. England, K. Greer, A. Krywonos, W. E. McClintock, T. Plummer, V. Veibell   +17 more
doaj   +1 more source

Thermosphere circulation modeled

Eos, Transactions American Geophysical Union, 1981
When solar storms force the earth's auroras to lower latitudes, winds in the thermosphere reverse direction and are whipped up to velocities of 2250 km/h. A computer model has now been developed that will describe the circulation of the thermosphere—a 400‐km blanket enveloping the earth, with its bottom boundary at an altitude of 80 km—and its ...
openaire   +1 more source

Thermosphere UFKW Structures and Ionosphere Coupling as Observed by ICON

Geophysical Research Letters
Two ∼2‐week Ultra‐Fast Kelvin Wave (UFKW) events centered on days 158(203) during 2021 are investigated using winds, temperatures, plasma drifts and electron densities (Ne) measured by the Ionospheric CONnections (ICON) mission.
Jeffrey M. Forbes, Xiaoli Zhang, Christoph R. Englert, Roderick Heelis, Michael H. Stevens, Brian J. Harding, John M. Harlander, Kenneth D. Marr, Jonathan J. Makela, Thomas J. Immel   +9 more
doaj   +1 more source