Results 81 to 90 of about 14,994 (266)

Simultaneous Measurements of Variations in the Artificial Airglow and the Total Electron Content of the Ionosphere Caused by Powerful Radio Waves of "Sura'' Facility [PDF]

Учёные записки Казанского университета: Серия Физико-математические науки, 2016
The results of simultaneous observations of variations in the artificial airglow in the red line of the optical spectrum of atomic oxygen (630 nm) and the total electron content (TEC) of the ionosphere measured along the propagation paths of the ...
D.A. Kogogin, A.V. Shindin, I.A. Nasyrov, S.M. Grach   +3 more
doaj  

Long-term Spectroscopic Observations of the Atmospheric Airglow by the Sloan Digital Sky Survey

Publications of the Astronomical Society of the Pacific, 2018
Spectra of the atmospheric airglow, termed sky spectra, are collected to estimate the total amount of contamination present in science spectra, and are intended to be used in a sky subtraction process.
M. Hart
semanticscholar   +1 more source

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source

Enhancing Low‐Latitude Ionospheric Irregularity Prediction With Generalized Linear Models

Space Weather, Volume 24, Issue 3, March 2026.
Abstract The ionosphere poses challenges for accurate forecasting due to its complexity and variability. Irregularities in the lower ionosphere are influenced by local time, season, geographic location, solar activity and space weather, complicating precise predictions.
Alysson Brhian, Marco A. Ridenti, Francisco Azpilicueta, Mauricio Gende, Marisa Roberto   +4 more
wiley   +1 more source

Mutual Allocation of the Artificial Airglow Patches and Large‐Scale Irregularities in the HF‐Pumped Ionosphere

Geophysical Research Letters, 2018
The paper reports first simultaneous observations of artificial emission of 630‐nm oxygen red line, along with perturbations of slant total electron content (STEC).
S. Grach, I. Nasyrov, D. Kogogin, A. Shindin, E. Sergeev, S. A. Razi Mousavi   +5 more
semanticscholar   +1 more source

Strong Polar Ionospheric Electron Density Depletion Under Prolonged Northward IMF Bz Condition

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract Previous studies have primarily focused on high‐latitude ionospheric‐thermospheric (I‐T) variabilities under southward interplanetary magnetic field (IMF) conditions, while rare studies have investigated the I‐T responses to due northward Bz (NBz), especially in the presence of strong IMF By conditions.
Tianyu Cao, Yifan Lu, Jing Liu, Shuhan Li   +3 more
wiley   +1 more source

Statistics and variability of the altitude of elves

Geophysical Research Letters, 2016
From June 2008 to January 2016 nearly 800 elves have been recorded by a low‐light camera in northeastern Spain. Elves occur in this region mainly over the lower topped cold air mass maritime thunderstorms, peaking from November to January.
Oscar A. van derVelde, Joan Montanyà
doaj   +1 more source

Observations of the SW Sextantis star DW Ursae Majoris with the Far Ultraviolet Spectroscopic Explorer

, 2003
We present an analysis of the first far-ultraviolet observations of the SW Sextantis-type cataclysmic variable DW Ursae Majoris, obtained in November 2001 with the Far Ultraviolet Spectroscopic Explorer.
Biro I. B., Casares J., Christian Knigge, Cynthia S. Froning, D. W. Hoard, Dhillon V. S., Dickinson R. J., Knox S. Long, Koester D., Norton A. J., Paula Szkody, Rosen S. R., Rosen S. R., Rutten R. G. M., Vogt N., Zhang E.   +15 more
core   +1 more source

Far-UV Observations of NGC 4151 during the ORFEUS-SPAS II Mission [PDF]

, 1997
We observed the Seyfert 1 galaxy NGC 4151 on eleven occasions at 1-2 day intervals using the Berkeley spectrometer during the ORFEUS-SPAS II mission in 1996 November.
A. F. Davidsen, B. R. Espey, Bromage G., G. A. Kriss, Hurwitz M., J. H. Krolik, Ulrich M. H., W. Zheng, Z. Tsvetanov   +8 more
core   +2 more sources

Study of the Mid‐Latitude Airglow Responses to Geomagnetic Storms Based on Long‐Term Observations in Japan With the TIMED Satellite and Ionosondes

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Variations in nighttime airglow at mid‐latitudes during geomagnetic disturbances reflect the propagation of atmospheric and plasma disturbances from polar heating as well as local chemical processes. However, their detailed mechanisms remain unclear.
Y. Hotta, K. Shiokawa, Y. Otsuka, M. Nishioka, J. Yue   +4 more
wiley   +1 more source