Results 11 to 20 of about 2,328,776 (249)
Statistical studies of low-power solar flares. Distribution of flares by area, brightness, and classes [PDF]
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 +4 more sources
X-Ray, Near-ultraviolet, and Optical Flares Produced by Colliding Magnetospheres in the Young High-eccentricity Binary DQ Tau [PDF]
The Astrophysical Journal, 2023 DQ Tau is a unique young high-eccentricity binary system that exhibits regular magnetic reconnection flares and pulsed accretion near periastron. We conducted NuSTAR, Swift, and Chandra observations during the 2022 July 30 periastron to characterize X ...
Konstantin V. Getman +5 more
doaj +3 more sources
The Astrophysical JournalWe present a comprehensive multiwavelength investigation into flares and activity in nearby M dwarf stars. We leverage the most extensive contemporaneous data set obtained through the Transiting Exoplanet Sky Survey, Kepler/K2, the Neil Gehrels Swift ...
Rishi R. Paudel +16 more
doaj +2 more sources
Gaia Sees Blazars Move: Locating Optical Flares Using Astrometry
The Astrophysical Journal LettersWhen blazars flare, their optical position moves. We show this by combining Gaia DR3 proper motions with epoch photometry for blazars with strong optical jet emission.
A. V. Plavin
doaj +2 more sources
The Astrophysical Journal, 2023 We present a multiwavelength study of stellar flares on primarily G-type stars using overlapping time domain surveys in the near-ultraviolet (NUV) and optical regimes. The NUV (the Galaxy Evolution Explorer; GALEX) and optical (Kepler) wavelength domains
C. E. Brasseur +3 more
doaj +1 more source
LOW-POWER SOLAR FLARES OF OPTICAL AND X-RAY WAVELENGTHS FOR SOLAR CYCLES 21–24
Solar-Terrestrial Physics, 2020 Using data obtained in optical and X-ray wavelengths, we have analyzed solar flare activity for cycles 21–24. Over the last three cycles, solar activity is shown to decrease significantly.
A.V. Borovik , A.A. Zhdanov
doaj +1 more source
The Astrophysical Journal, 2023 ASASSN-14ko is a nuclear transient at the center of the AGN ESO 253−G003 that undergoes periodic flares. Optical flares were first observed in 2014 by the All-Sky Automated Survey for Supernovae (ASAS-SN) and their peak times are well-modeled with a ...
Anna V. Payne +11 more
doaj +1 more source
Minutes-duration optical flares with supernova luminosities [PDF]
, 2023 In recent years, certain luminous extragalactic optical transients have been observed to last only a few days. Their short observed duration implies a different powering mechanism from the most common luminous extragalactic transients (supernovae), whose
Zheng, WeiKang +5 more
core +6 more sources
RoboPol: connection between optical polarization plane rotations and gamma-ray flares in blazars [PDF]
, 2018 We use results of our 3 yr polarimetric monitoring programme to investigate the previously suggested connection between rotations of the polarization plane in the optical emission of blazars and their gamma-ray flares in the GeV band. The homogeneous set
al., et +5 more
core +3 more sources
Dynamics of small-scale magnetic fields before small and large solar flares
Solar-Terrestrial Physics, 2023 We have examined the dynamics of the longitudinal magnetic field of active region NOAA 12673, using data from the Solar Dynamics Observatory (SDO). During the passage of the active region (AR) across the solar disk, its spots and background fields showed
Borovik A. V., Zhdanov A. A.
doaj +1 more source