Results 61 to 70 of about 14,994 (266)

GALEX Observations of Diffuse UV Radiation at High Spatial Resolution from the Sandage Nebulosity

, 2008
Using the GALEX ultraviolet imagers we have observed a region of nebulosity first identified as starlight scattered by interstellar dust by Sandage (1976). Apart from airglow and zodiacal emission, we have found a diffuse UV background of between 500 and
Abhay Karnataki, Boffi, Jayant Murthy, Luciana Bianchi, Martin, Morrissey, Murthy, Murthy, Murthy, N. V. Sujatha, Richard Conn Henry, Ryu, Sujatha, Sujatha   +13 more
core   +1 more source

Spatiotemporal evolution of radio wave pump-induced ionospheric phenomena near the fourth electron gyroharmonic [PDF]

, 2007
On 12 November 2001, the European Incoherent Scatter (EISCAT) high-frequency (HF) radio wave transmitter facility, operating in O-mode at 5.423 MHz with 550 MW effective radiated power, produced artificial optical rings which appeared immediately at ...
Ashrafi, M., Isham, B., Kaila, K., Kosch, Mike J.   +3 more
core   +1 more source

Strong Variability of the Modeled Venus NO Nightglow

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract The ultraviolet nightglow of nitric oxide (NO) on Venus offers a unique window into the dynamics and chemistry of its upper atmosphere. We present three‐dimensional simulations of Venus' NO nightglow using a ground‐to‐thermosphere model, revealing a strong, short‐timescale variability consistent with observations.
N. Streel, F. Lefèvre, A. Martinez, A. Määttänen, A. Stolzenbach, S. Lebonnois, J. C. Gérard, L. Soret   +7 more
wiley   +1 more source

Observations of OH airglow from ground, aircraft, and satellite: investigation of wave-like structures before a minor stratospheric warming

Atmospheric Chemistry and Physics, 2018
. In January and February 2016, the OH airglow camera system FAIM (Fast Airglow Imager) measured during six flights on board the research aircraft FALCON in northern Scandinavia. Flight 1 (14 January 2016) covering the same ground track in several flight
S. Wüst, C. Schmidt, P. Hannawald, M. Bittner, M. Mlynczak, J. Russell III   +5 more
semanticscholar   +1 more source

Mars Thermospheric Variability: Disentangling the Influence of Irradiance, Dust, and Dynamics

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract We present a comprehensive analysis of Martian thermospheric variability using nearly a decade of solar occultation measurements from the MAVEN Extreme Ultraviolet Monitor (EUVM). These data provide vertical profiles of CO2 ${\text{CO}}_{2}$ density and temperature from ∼130 ${\sim} 130$ to 180 km at dawn and dusk, enabling the investigation ...
E. M. B. Thiemann, S. Bougher, N. Jones, E. Yiğit, F. Gasperini, C. Payne, R. Sewell, F. G. Eparvier, S. Curry   +8 more
wiley   +1 more source

Unraveling Super Equatorial Plasma Bubbles (EPBs) Evolution During the 23 April 2023 Storm: Multi‐Instrument Observations and GITM‐SAMI3 Simulation

Space Weather, Volume 24, Issue 4, April 2026.
Abstract Storm‐time equatorial plasma bubble (EPB) dynamics play a critical role in space weather impacts on communication and navigation systems, yet the mechanisms governing their formation and evolution under storm conditions remain poorly understood.
Shasha Zou, Yulu Peng, Mary Smirnova, Grace Kwon, Zihan Wang, Joseph Huba, Aaron Ridley   +6 more
wiley   +1 more source

Daily Variability in the Terrestrial UV Airglow

Atmosphere, 2020
New capability for observing conditions in the upper atmosphere comes with the implementation of global ultraviolet (UV) imaging from geosynchronous orbit. Observed by the NASA GOLD mission, the emissions of atomic oxygen (OI) and molecular nitrogen (N2)
Thomas J. Immel, Richard W. Eastes, William E. McClintock, Steven B. Mende, Harald U. Frey, Colin Triplett, Scott L. England   +6 more
doaj   +1 more source

Application of tomographic inversion in studying airglow in the mesopause region [PDF]

Annales Geophysicae, 1998
It is pointed out that observations of periodic nightglow structures give excellent information on atmospheric gravity waves in the mesosphere and lower thermosphere.
T. Nygrén, M. J. Taylor, M. S. Lehtinen, M. Markkanen   +3 more
doaj   +1 more source

GALEX FUV Observations of Comet C/2004 Q2 (Machholz): The Ionization Lifetime of Carbon

, 2010
We present a measurement of the lifetime of ground state atomic carbon, C(^3P), against ionization processes in interplanetary space and compare it to the lifetime expected from the dominant physical processes likely to occur in this medium.
Axford, Bockelée-Morvan, Bonev, Combi, Combi, Eberhardt, Feldman, Festou, Glinski, Harold A. Weaver, Harris, Haser, Hibbert, Jeffrey P. Morgenthaler, Kobayashi, Krishna-Swamy, Kupperman, Lupu, Markwardt, Martin, McPhate, Michael R. Combi, Morrissey, Morrissey, Moré, Paul D. Feldman, Sujatha, Tozzi, van Dishoeck, Walter M. Harris   +29 more
core   +1 more source

The night-sky at the Calar Alto Observatory [PDF]

, 2007
We present a characterization of the main properties of the night-sky at the Calar Alto observatory for the time period between 2004 and 2007. We use optical spectrophotometric data, photometric calibrated images taken in moonless observing periods ...
Burki G., D. Pérez‐Ramírez, Holmes R. W., Ingham M. F., J. Aceituno, J. Alves, Lane M., Leinert C., Pedani M., Rufener F., S. F. Sánchez, Smith F. G., Treanor P. J., Tug H., U. Thiele, Walker A., Walker A., Walker M. F.   +17 more
core   +3 more sources