Results 61 to 70 of about 9,046 (214)
Solar Vortex Tubes. III. Vorticity and Energy Transport
The Astrophysical JournalThis study investigated the mechanisms of vorticity generation and the role of vortex tubes in plasma heating and energy transport. Vortex tubes were identified using the instantaneous vorticity deviation technique in the MURaM data set of a simulated ...
Suzana S. A. Silva +7 more
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Wavelet analysis of spatial coherent structures in the photosphere
, 1999 In this work we present some applications of wavelet analysis to the dynamics of the photosphere as obtained from a good serie of high spatial resolution white light images taken at the Vacuum Tower Telescope (VTT) at the NSO/SPO in October 1996. The use
Berrilli, F +7 more
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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
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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
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Astronomy & AstrophysicsContext. Space weather and its potential negative consequences for life on Earth have received increasing scientific attention in recent decades. In particular, predicting the onset of coronal mass ejections (CMEs) has become important from a security ...
Furuseth S. V., Aulanier G.
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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
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Thermal Bifurcation Of the Outer Photosphere [PDF]
Symposium - International Astronomical Union, 1990 The degree of thermal heterogeneity at the base of the solar chromosphere is substantially beyond that simulated in the best-available multi-component models; casting serious doubts on inferences drawn from them.
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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
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PHYSICS OF NONDISSIPATIVE ULTRARELATIVISTIC PHOTOSPHERES [PDF]
International Journal of Modern Physics D, 2014 Recent observations, especially by the Fermi satellite, point out the importance of the thermal component in GRB spectra. This fact revives strong interest in photospheric emission from relativistic outflows. Early studies already suggested that the observed spectrum of photospheric emission from relativistically moving objects differs in shape from ...
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Fish and plants viewed from the Williamson Photosphere, 1914
, 1914 Fish and plants underwater, as viewed from the Williamson Photosphere, 1914.https://digitalcommons.chapman.edu/jonathan_silent_film/2174/thumbnail ...
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