Record-breaking Coronal Magnetic Field in Solar Active Region 12673 [PDF]
The Astrophysical Journal Letters, 2019 Abstract The strongest magnetic fields on the Sun are routinely detected at dark sunspots. The magnitude of the field is typically about 3000 G, with only a few exceptions that reported the magnetic field in excess of 5000 G. Given that the magnetic field decreases with height in the solar atmosphere, no coronal magnetic field above ...
Sergey A. Anfinogentov +3 more
openaire +4 more sources
Changes of Magnetic Energy and Helicity in Solar Active Regions from Major Flares [PDF]
The Astrophysical Journal, 2023 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
doaj +2 more sources
Determination of the Topology Skeleton of Magnetic Fields in a Solar Active Region [PDF]
Chinese Journal of Astronomy and Astrophysics, 2008 13 pages, 7 figures, 1 ...
Zhao, Hui +4 more
openaire +4 more sources
Hinode/EIS Measurements of Active-region Magnetic Fields [PDF]
Astrophysical Journal, 2020 The present work illustrates the potential of a new diagnostic technique that allows the measurement of the coronal magnetic field strength in solar active regions by utilizing a handful of bright Fe x and Fe xi lines commonly observed by the high ...
E. Landi +3 more
semanticscholar +1 more source
The evolution of a spot–spot-type solar active region which produced a major solar eruption
Frontiers in Astronomy and Space Sciences, 2023 Solar active regions are the main sources of large solar flares and coronal mass ejections. It is found that the active regions producing large eruptions usually show compact, highly sheared polarity inversion lines.
Lijuan Liu, Lijuan Liu, Lijuan Liu
doaj +1 more source
The Trigger Mechanism of Recurrent Solar Active Region Jets Revealed by the Magnetic Properties of a Coronal Geyser Site [PDF]
Astrophysical Journal, 2020 Solar active region jets are small-scale collimated plasma eruptions that are triggered from magnetic sites embedded in sunspot penumbral regions. Multiple trigger mechanisms for recurrent jets are under debate.
A. Paraschiv, A. Donea, K. Leka
semanticscholar +1 more source
Mapping solar magnetic fields from the photosphere to the base of the corona [PDF]
Science Advances, 2021 A novel space experiment achieves an unprecedented map of solar magnetic fields from the photosphere to the base of the corona. Routine ultraviolet imaging of the Sun’s upper atmosphere shows the spectacular manifestation of solar activity; yet, we ...
R. Ishikawa +27 more
semanticscholar +1 more source
Large Photospheric Doppler Shift in Solar Active Region 12673. I. Field-aligned Flows
The Astrophysical Journal, 2023 Delta ( δ ) sunspots sometimes host fast photospheric flows along the central magnetic polarity inversion line (PIL). Here we study the strong Doppler shift signature in the central penumbral light bridge of solar active region NOAA 12673.
Jiayi Liu +5 more
doaj +1 more source
Diagnostic Functions of Solar Coronal Magnetic Fields from Radio Observations [PDF]
Research in Astronomy and Astrophysics, 2022 In solar physics, it is a big challenge to measure the magnetic fields directly from observations in the upper solar atmosphere, including the chromosphere and corona. Radio observations are regarded as the most feasible approach to diagnose the magnetic
B. Tan
semanticscholar +1 more source
On the Origin of the Photospheric Magnetic Field
The Astrophysical Journal, 2022 This article presents results that challenge the paradigms that (1) the convection zone is the source of the radial magnetic field in the photosphere and (2) that coronal currents are neutralized from the perspective of the photosphere.
Peter W. Schuck +3 more
doaj +1 more source