The 6 September 2017 X-Class Solar Flares and Their Impacts on the Ionosphere, GNSS, and HF Radio Wave Propagation. [PDF]
Space Weather, 2018 On 6 September 2017, the Sun emitted two significant solar flares (SFs). The first SF, classified X2.2, peaked at 09:10 UT. The second one, X9.3, which is the most intensive SF in the current solar cycle, peaked at 12:02 UT and was accompanied by solar ...
Yasyukevich Y +5 more
europepmc +2 more sources
Statistical Studies of Solar White-Light Flares and Comparisons with Superflares on Solar-type Stars [PDF]
, 2017 Recently, many superflares on solar-type stars have been discovered as white-light flares (WLFs). The statistical study found a correlation between their energies ($E$) and durations ($\tau$): $\tau \propto E^{0.39}$ (Maehara et al. 2017 $EP\& S$, 67, 59)
Asai, Ayumi +11 more
core +2 more sources
Predicting Solar Flares Using CNN and LSTM on Two Solar Cycles of Active Region Data [PDF]
Astrophysical Journal, 2021 We consider the flare prediction problem that distinguishes flare-imminent active regions that produce an M- or X-class flare in the succeeding 24 hr, from quiet active regions that do not produce any flares within ±24 hr.
Zeyu Sun +7 more
semanticscholar +1 more source
Evolution of Elemental Abundances during B-Class Solar Flares: Soft X-Ray Spectral Measurements with Chandrayaan-2 XSM [PDF]
Astrophysical Journal, 2021 The Solar X-ray Monitor (XSM) payload on board Chandrayaan-2 provides disk-integrated solar spectra in the 1–15 keV energy range with an energy resolution of 180 eV (at 5.9 keV) and a cadence of 1 s.
B. Mondal +8 more
semanticscholar +1 more source
Probing the Physics of the Solar Atmosphere with the Multi-slit Solar Explorer (MUSE). II. Flares and Eruptions [PDF]
Astrophysical Journal, 2021 Current state-of-the-art spectrographs cannot resolve the fundamental spatial (subarcseconds) and temporal (less than a few tens of seconds) scales of the coronal dynamics of solar flares and eruptive phenomena.
M. Cheung +26 more
semanticscholar +1 more source
Statistical Study of GOES X-Ray Quasi-periodic Pulsations in Solar Flares [PDF]
Astrophysical Journal, 2020 Small-amplitude quasi-periodic pulsations (QPPs) detected in soft X-ray emission are commonplace in many flares. To date, the underpinning processes resulting in the QPPs are unknown.
L. Hayes +4 more
semanticscholar +1 more source
Magnetic Flux of Active Regions Determining the Eruptive Character of Large Solar Flares [PDF]
Astrophysical Journal, 2020 We establish the largest eruptive/confined flare database to date and analyze 322 flares of Geostationary Operational Environmental Satellite class M1.0 and larger that occurred during 2010–2019, i.e., almost spanning all of solar cycle 24.
Ting Li +5 more
semanticscholar +1 more source
Thermal-nonthermal energy partition in solar flares derived from X-ray, EUV, and bolometric observations [PDF]
Astronomy & Astrophysics, 2020 Context. In solar flares, energy is released impulsively and is partly converted into thermal energy of hot plasmas and kinetic energy of accelerated nonthermal particles.
A. Warmuth, G. Mann
semanticscholar +1 more source
Predicting Solar Flares Using a Novel Deep Convolutional Neural Network
Astrophysical Journal, 2020 Space weather forecasting is very important, and the prediction of space weather, especially for solar flares, has increasingly attracted research interests with the numerous recent breakthroughs in machine learning.
Xuebao Li +3 more
semanticscholar +1 more source