Results 61 to 70 of about 155,544 (195)
Non-Gaussian Velocity Distributions in Solar Flares from Extreme Ultraviolet Lines: A Possible Diagnostic of Ion Acceleration [PDF]
, 2017 In a solar flare, a large fraction of the magnetic energy released is converted rapidly to the kinetic energy of non-thermal particles and bulk plasma motion.
N. Jeffrey, L. Fletcher, N. Labrosse
semanticscholar +1 more source
Localizing Quasiperiodic Pulsations in Hard X-Ray, Microwave, and Lyα Emissions of an X6.4 Flare
The Astrophysical JournalWe report the simultaneous observations of quasiperiodic pulsations (QPPs) in wavelengths of hard X-ray (HXR), microwave, Ly α , and ultraviolet (UV) emissions during the impulsive phase of an X6.4 flare on 2024 February 22 (SOL2024-02-22T22:08).
Dong Li +3 more
doaj +1 more source
The Astrophysical Journal, 2023 Solar flares are driven by the release of free magnetic energy and its conversion to other forms of energy—kinetic, thermal, and nonthermal. Quantification of partitions between these energy components and their evolution is needed to understand the ...
Gregory D. Fleishman +2 more
doaj +1 more source
The Astrophysical JournalAbstract We present a study of the influence of solar UV anisotropy on the heliospheric backscatter helioglow generated by resonant scattering of solar Lyα photons on interstellar hydrogen atoms around the Sun. Simulations based on the WawHelioGlow model suggest that the response of the helioglow pole-to-ecliptic ratio to the anisotropy
M. Strumik, M. Bzowski, M. A. Kubiak
openaire +2 more sources
Validation of Extreme Ultraviolet Emission Spectra During Solar Flares
, 2020 Abstract X-rays and extreme ultraviolet (EUV) emissions from solar flares rapidly change the physical composition of the Earth’s thermosphere and ionosphere, thereby causing space weather phenomena such as communication failures. To predict the effects of flare emissions on the Earth’s upper atmosphere, numerous empirical and physical models ...
Shohei Nishimoto +4 more
openaire +1 more source
Solar Flare Prediction Model with Three Machine-learning Algorithms using Ultraviolet Brightening and Vector Magnetograms [PDF]
, 2016 We developed a flare prediction model using machine learning, which is optimized to predict the maximum class of flares occurring in the following 24 hr.
N. Nishizuka +5 more
semanticscholar +1 more source
Genesis of a Confined X6.4 Flare in a Quadrupolar Magnetic Configuration
The Astrophysical JournalBoth eruptive and confined flares—those having and lacking, respectively, an associated large-scale coronal mass ejection—are frequently observed in solar active regions (ARs).
Chunming Zhu +5 more
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Spectroscopic Case Studies of Four Long-duration Transition-region Explosive Events
The Astrophysical JournalThis work presents a detailed spectroscopic case study of four long-duration transition-region (TR) explosive events (EEs) observed in NOAA Active Region 13213 on 2023 February 10 using the Interface Region Imaging Spectrograph.
Yi’an Zhou +5 more
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Solar Atmospheric Oscillations as Measured by the GOES-R Series EXIS EUVS-C Instrument
The Astrophysical Journal LettersThis Letter presents first observations of distinct solar atmospheric oscillations from signals collected by the Extreme Ultraviolet and X-ray Irradiance Sensors EUVS-C instrument, which is part of each Geostationary Observational Environmental Satellite
Thomas D. Eden Jr. +6 more
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Nonthermal Velocities in a Solar Active Region Observed by SERTS
The Astrophysical JournalWe present measurements of coronal nonthermal Doppler velocities in NOAA Active Region 7870 observed by the Solar EUV Research Telescope and Spectrograph during its 1995 sounding rocket flight (SERTS-95).
Jeffrey W. Brosius
doaj +1 more source