The Relationship between Kinetic and Magnetic Helicity in Solar Active Regions
The Astrophysical JournalUsing Helioseismic and Magnetic Imager/Solar Dynamics Observatory data, we search for a relationship between kinetic helicity and magnetic helicity in solar active regions (ARs) using a sample of 62 ARs from 2010 May to 2015 May.
Yang Liu +5 more
doaj +1 more source
Turbulence of Tropical Cyclones: From Peristrophic to Zonostrophic
Journal of Geophysical Research: Atmospheres, Volume 130, Issue 14, 28 July 2025.Abstract Cyclostrophic rotation in the core region of tropical cyclones (TCs) imprints a distinct signature upon their turbulence structure. Its intensity is characterized by the radius of maximum wind, Rmw ${R}_{mw}$, and the azimuthal wind velocity at that radius, Umax ${U}_{max}$.
Boris Galperin +3 more
wiley +1 more source
Subphotospheric Emission from Short Gamma-Ray Bursts: Protons Mold the Multimessenger Signals
The Astrophysical Journal LettersThe origin of the observed Band-like photon spectrum in short gamma-ray bursts (sGRBs) is a long-standing mystery. We carry out the first general relativistic magnetohydrodynamic simulation of an sGRB jet with initial magnetization σ _0 = 150 in ...
Annika Rudolph +2 more
doaj +1 more source
The Striated Solar Photosphere Observed at Resolution
The Astrophysical Journal LettersStriated granular edges observed in the solar photosphere represent one of the smallest-scale phenomena on the Sun. They arise from the interaction of strongly coupled hydrodynamic, magnetic, and radiative properties of the plasma.
David Kuridze +7 more
doaj +1 more source
Transient rotation of photospheric vector magnetic fields associated with a solar flare
Nature Communications, 2018 The violent solar eruptions known as flares are caused by magnetic reconnection. Here, the authors identify a sudden 12°–20° counter clockwise rotation of vector magnetic fields in photosphere, associated with the emissions of moving flare ribbons.
Yan Xu +9 more
doaj +1 more source
Radial dependence of line profile variability in seven O9--B0.5 stars
, 2014 Massive stars show a variety of spectral variability: presence of discrete absorption components in UV P-Cygni profiles, optical line profile variability, X-ray variability, radial velocity modulations.
Bouret, J. -C. +4 more
core +5 more sources
Observational Evidence of Shallow Origins for the Magnetic Fields of Solar Cycles
Frontiers in Astronomy and Space Sciences, 2018 Observational evidence for the origin of active region magnetic fields has been sought from published information on extended solar cycles, statistical distributions of active regions and ephemeral regions, helioseismology results, positional ...
Sara F. Martin
doaj +1 more source
Optically Thick Jet Base and Explanation of Edge Brightening in Active Galactic Nucleus Jets
The Astrophysical JournalThe jet cores in active galactic nuclei (AGNs) are resolved and found to harbor an edge-brightened structure where the jet base appears extended at the sides compared to its propagation axis. This peculiar phenomenon invites various explanations. We show
Mukesh Kumar Vyas, Asaf Pe’er
doaj +1 more source
A new spectroscopic method for measuring the temperature gradient in the solar photosphere [PDF]
, 2020 M. Faurobert +3 more
openalex +1 more source
PHOTOSPHERIC EMISSION FROM STRATIFIED JETS
The Astrophysical Journal, 2013 18 pages, 14 figures, accepted for publication in ...
Ito, Hirotaka +8 more
openaire +2 more sources