Results 21 to 30 of about 2,210,115 (287)
Optical High-Capacity Satellite Downlinks via High-Altitude Platform Relays [PDF]
, 2007 Earth-observation (EO) satellite missions produce a large amount of data using high-resolution optical or radar sensors. During the last decades the amount of data has steadily increased due to improved sensor technologies with increased temporal ...
Florian Moll +13 more
core +1 more source
Catching profound optical flares in blazars
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT Flaring episodes in blazars represent one of the most violent processes observed in extra-galactic objects. Studies of such events shed light on the energetics of the physical processes occurring in the innermost regions of blazars, which cannot otherwise be resolved by any current instruments.
Gopal Bhatta +13 more
openaire +3 more sources
Results of the Optical Downlink Experiment KIODO from OICETS Satellite to Optical Ground Station Oberpfaffenhofen (OGS-OP) [PDF]
, 2007 Optical LEO downlinks from the Japanese OICETS to the optical ground station built by the German Aerospace Center (DLR) near Munich have been performed. This was the first optical LEO downlink on European grounds.
Perlot, Nicolas +13 more
core +1 more source
On Impulsive and Gradual Optical Solar Flares [PDF]
International Astronomical Union Colloquium, 1989 AbstractA comparative study of H-alpha intensity and area development of several flares is presented in an attempt to investigate characteristic features of various types of optical solar flares.
A. Bhatnagar +3 more
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Solar-Terrestrial Physics, 2017 An electronic database has been created for 123801 solar flares that occurred on the Sun over the period from 1972 to 2010. It is based on catalogs of the Solar Geophysical Data (SGD) and Quarterly Bulletin on Solar Activity.
Borovik A.V., Zhdanov A.A.
doaj +1 more source
Optical and Ultraviolet Stellar Flare Spectroscopy [PDF]
International Astronomical Union Colloquium, 1983 As for solar flares, one of the most physically revealing types of data for M-dwarf flares are high-resolution, time-resolved spectra. Due to the intrinsically faint nature of the M-dwarf stars, spectroscopic data has tended to be of low spectral (˜ 5 Ǻ) and temporal (˜ 5 min) resolution. However, with the development of image intensified spectrographs
openaire +1 more source
Performance optimization of free-space optical communication protocols based on results from FSO demonstrations [PDF]
, 2007 The mobile free-space optical channel mainly suffers from relatively long link outages, produced by short-term blockings of the line-of-sight (obstacles, clouds), pointing- and tracking-errors or deep signal-fades caused by index of refraction turbulence
Bernhard Epple, Epple, Bernhard
core +1 more source
Optical Spectroscopy of a Flare on Barnard’s Star
Publications of the Astronomical Society of the Pacific, 2006 Accepted for publication in ...
Paulson, D. +5 more
openaire +2 more sources
Optical Flares of Cygnus X-1 [PDF]
Symposium - International Astronomical Union, 1998 Photoelectric observations of Cyg X-1 in 1996-97 fulfilled in Tien-Shan, Kazakhstan (WBVR), Mt. Maidanak, Uzbekistan (UBVR) and in Crimea, Ukraine (UBV) have detected unusual optical flare activity. During May-August 1996 Cyg X-1 was in high soft X-ray state and after August 9, 1996 it returned to its ordinary state but with some evidences of X-ray ...
N.G. Bochkarev +2 more
openaire +1 more source
The Astrophysical Journal, 2023 Previous examinations of fully convective M-dwarf stars have highlighted enhanced rates of nanoflare activity on these distant stellar sources. However, the specific role the convective boundary, which is believed to be present for spectral types earlier
S. D. T. Grant +13 more
doaj +1 more source