Results 31 to 40 of about 41,536 (207)

Relationship between photospheric currents and coronal magnetic helicity for force-free bipolar fields [PDF]

, 2009
Aims. The origin and evolution of the magnetic helicity in the solar corona are not well understood. For instance, the magnetic helicity of an active region is often about 1042 Mx2 (1026 Wb2), but the observed processes whereby it is thought to be ...
Aly, Amari, Amari, Amari, Aulanier, Aulanier, Berger, Canfield, Chae, Démoulin, Gibson, Grad, Heyvaerts, Kusano, Leamon, Longcope, Longcope, Mackay, Mackay, Magara, Parker, Rust, Régnier, Régnier, Régnier, Régnier, S. Régnier, Sakurai, Sturrock, Török, Welsch, Yeates   +31 more
core   +3 more sources

Data-driven model of the solar corona above an active region [PDF]

Astronomy & Astrophysics, 2019
Aims. We aim to reproduce the structure of the corona above a solar active region as seen in the extreme ultraviolet (EUV) using a three-dimensional magnetohydrodynamic (3D MHD) model. Methods. The 3D MHD data-driven model solves the induction equation and the mass, momentum, and energy balance.
J. Warnecke, H. Peter
openaire   +3 more sources

Magnetic Fields beneath Active Region Coronal Loops

The Astrophysical Journal
We examine the hypothesis that multipolar magnetic fields advected by photospheric granules can contribute to heating the active chromosphere and corona.
Philip G. Judge, L. Kleint, C. Kuckein
doaj   +1 more source

Generation of Fast Magnetoacoustic Waves in the Corona by Impulsive Bursty Reconnection

The Astrophysical Journal
Fast-mode magnetohydrodynamic waves in the solar corona are often known to be produced by solar flares and eruptive prominences. Here, we simulate the effect of the interaction of an external perturbation on a magnetic null in the solar corona, which ...
Sripan Mondal, Abhishekh Kumar Srivastava, David I. Pontin, Eric R. Priest, R. Y. Kwon, Ding Yuan   +5 more
doaj   +1 more source

The SWAP EUV Imaging Telescope Part I: Instrument Overview and Pre-Flight Testing [PDF]

, 2012
The Sun Watcher with Active Pixels and Image Processing (SWAP) is an EUV solar telescope on board ESA's Project for Onboard Autonomy 2 (PROBA2) mission launched on 2 November 2009.
A. De Groof, A. De Groof, B. Nicula, C. L. Raftery, C.E. DeForest, C.L. Raftery, D. B. Seaton, D. Berghmans, D. Berghmans, D. S. Bloomfield, E. D’Huys, E. Mazy, F. Auchère, J. Zender, J. Zender, J.-F. Hochedez, J.-H. Lecat, J.-M. Defise, J.-P. Delaboudinière, J.-P. Halain, J.M. Defise, J.M. Pasachoff, J.R. Lemen, L. Rossi, M. S. Yalim, M.-F. Ravet, P. Rochus, P. T. Gallagher, R.A. Howard, S.L. Freeland, T. Thibert, U. Schühle, V. Slemzin, V. Slemzin   +33 more
core   +1 more source

Signatures of Slow Solar Wind Streams from Active Regions in the Inner Corona [PDF]

Solar Physics, 2012
Accepted for publication in Solar Physics; 31 Pages; 13 ...
Slemzin, V., Harra, L., Urnov, A., Kuzin, S., Goryaev, F., Berghmans, D.   +11 more
openaire   +2 more sources

Ubiquitous High-frequency Waves and Disturbances in the Active Region Corona Observed with Cryo-NIRSP

The Astrophysical Journal
The plasma of the solar corona harbors a multitude of coronal wave modes, some of which could be dissipated to provide the required energy and momentum to heat the corona and accelerate the solar wind.
Momchil E. Molnar, Richard Morton, Alin Paraschiv, Chris Gilly, Steven R. Cranmer, Kevin Reardon, Thomas Schad   +6 more
doaj   +1 more source

An analytical model of prominence dynamics

, 2017
Solar prominences are magnetic structures incarcerating cool and dense gas in an otherwise hot solar corona. Prominences can be categorized as quiescent and active.
Bhat, Atul, Routh, Swati, Saha, Snehanshu, Sundar, M. N.   +3 more
core   +1 more source

A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves [PDF]

, 2017
Solar eruptions are the most spectacular events in our solar system and are associated with many different signatures of energy release including solar flares, coronal mass ejections, global waves, radio emission and accelerated particles. Here, we apply
Carley, Eoin P., Graham, Georgina, Long, David M., Murphy, Pearse, Pérez-Suárez, David   +4 more
core   +2 more sources

Modeling of non-thermal fractions formed in the extended hydrogen corona at Mars

Frontiers in Astronomy and Space Sciences
Solar forcing on the upper atmospheres of terrestrial planets occurs through both the absorption of soft X-ray and extreme ultraviolet (XUV) solar radiation and the influx of solar wind plasma resulting in the formation of an extended neutral corona ...
Valery Shematovich, Dmitry Bisikalo, Dmitry Bisikalo   +2 more
doaj   +1 more source