Results 21 to 30 of about 14,551 (173)
Changes of Magnetic Energy and Helicity in Solar Active Regions from Major Flares [PDF]
Astrophysical Journal, 2022 Magnetic free energy powers solar flares and coronal mass ejections, and the buildup of magnetic helicity might play a role in the development of unstable structures that subsequently erupt.
Yang Liu +7 more
semanticscholar +1 more source
Magnetic and Velocity Field Topology in Active Regions of Descending Phase of Solar Cycle 23 [PDF]
Solar Physics, 2020 23 pages, 11 figures, Accepted for publication in Solar ...
R. A. Maurya, A. Ambastha
openaire +2 more sources
Nonthermal Velocity in the Transition Region of Active Regions and Its Center-to-limb Variation [PDF]
, 2021 We derive the nonthermal velocities (NTVs) in the transition region of an active region using the Si iv 1393.78 Å line observed by the Interface Region Imaging Spectrograph and compare them with the line-of-sight photospheric magnetic fields obtained by ...
A. Ghosh, D. Tripathi, J. Klimchuk
semanticscholar +1 more source
Expulsion of Counter Evershed Flows from Sunspot Penumbrae
The Astrophysical Journal, 2023 In addition to the Evershed flow directed from the umbra toward the outer boundary of a sunspot, under special circumstances a counter Evershed flow (CEF) in the opposite direction also occurs.
J. S. Castellanos Durán +2 more
doaj +1 more source
Proceedings of the International Astronomical Union, 2023 AbstractIn this article, the physical processes occurring in the convective layer and the photosphere of the Sun and their connection to the formation of active regions (ARs) and the development of the corresponding magnetic field are explored. Specifically, we test the magnetic flux emergence hypothesis and based on the line-of-sight magnetic field ...
A. M. Sadykov, S. A. Krasotkin
openaire +2 more sources
Evolution of the Active Region NOAA 12443 based on magnetic field extrapolations: preliminary results [PDF]
Proceedings of the International Astronomical Union, 2016 The behavior of Active Regions (ARs) is directly related to the occurrence of some remarkable phenomena in the Sun such as solar flares or coronal mass ejections (CME).
André Chicrala +8 more
semanticscholar +2 more sources
The Astrophysical Journal, 2023 The distribution and evolution of photospheric magnetic fields in sunspots, plages, and network, and variations in their relative flux content, play key roles in radial velocity (RV) fluctuations observed in Sun-as-a-star spectra.
Anisha Sen, S. P. Rajaguru
doaj +1 more source
The Astrophysical Journal, 2023 Using time–distance local helioseismology flow maps within 1 Mm of the solar photosphere, we detect inflows toward activity belts that contribute to solar-cycle scale variations in the near-surface meridional flow. These inflows stretch out as far as 30°
Sushant S. Mahajan +2 more
doaj +1 more source
Novel Approach to Forecasting Photospheric Emergence of Active Regions
The Astrophysical Journal Letters, 2023 One key aspect of understanding the solar dynamo mechanism and the evolution of solar magnetism is to properly describe the emergence of solar active regions.
S. S. A. Silva +11 more
doaj +1 more source