Results 1 to 10 of about 6,269,186 (288)

GLOBAL DYNAMICS OF SUBSURFACE SOLAR ACTIVE REGIONS [PDF]

The Astrophysical Journal, 2012
23 pages (ApJ 2-column format), 19 figures, accepted for publication in ...
Jouve, L., Brun, A.S., Aulanier, G.
openaire   +3 more sources

PATTERNS OF ACTIVITY IN A GLOBAL MODEL OF A SOLAR ACTIVE REGION

The Astrophysical Journal, 2016
ABSTRACT In this work we investigate the global activity patterns predicted from a model active region heated by distributions of nanoflares that have a range of frequencies. What differs is the average frequency of the distributions. The activity patterns are manifested in time lag maps of narrow-band instrument channel pairs.
S. J. Bradshaw, N. M. Viall
openaire   +2 more sources

Mother’s Day Superstorms: Pre- and Post-storm Evolutionary Patterns of ARs 13664/8

The Astrophysical Journal
In the week including Mother’s Day 2024, active region (AR) 13664 became superactive when AR 13668 emerged nearby, causing multiple X-class flares and coronal mass ejections, and an increase in activity level similar to that inferred from geomagnetic ...
Mausumi Dikpati, Marianna B. Korsós, Aimee A. Norton, Breno Raphaldini, Kiran Jain, Scott W. McIntosh, Peter A. Gilman, Andre S. W. Teruya, Nour E. Raouafi   +8 more
doaj   +1 more source

Active regions [PDF]

Solar Physics, 1970
<p>Published - <a href="/records/3vtm5-qqc59/files/1970SoPh___14__328Z.pdf?download=1">1970SoPh___14__328Z.pdf</a></p>
openaire   +2 more sources

High-resolution Observations of a C9.3 White-light Flare and Its Impact on the Solar Photosphere

The Astrophysical Journal Letters
We present a detailed analysis of a C9.3 white-light flare using high-resolution observations from the New Vacuum Solar Telescope. The flare occurred near the eastern solar limb on 2023 September 11, within NOAA AR 13431, and produced beam electrons with
Zhe Xu, Xiaoli Yan, Zhentong Li, Liheng Yang, Zhike Xue, Jincheng Wang, Yian Zhou   +6 more
doaj   +1 more source

Center-to-limb variations of solar active regions

Astronomy & Astrophysics
Accurate modeling of stellar active regions (ARs) remains a major bottleneck for radial-velocity and transmission-spectroscopy studies aimed at finding Earth-like planets. While much effort has been devoted to AR modeling, their center-to-limb variations
Pietrow A. G. M., Sumra S., Petit dit de la Roche D. J. M., Lößnitz E. J., Denker C., Aßmus M.   +5 more
doaj   +1 more source

Slow Solar Wind Connection Science during Solar Orbiter’s First Close Perihelion Passage

The Astrophysical Journal Supplement Series, 2023
The Slow Solar Wind Connection Solar Orbiter Observing Plan (Slow Wind SOOP) was developed to utilize the extensive suite of remote-sensing and in situ instruments on board the ESA/NASA Solar Orbiter mission to answer significant outstanding questions ...
Stephanie L. Yardley, Christopher J. Owen, David M. Long, Deborah Baker, David H. Brooks, Vanessa Polito, Lucie M. Green, Sarah Matthews, Mathew Owens, Mike Lockwood, David Stansby, Alexander W. James, Gherardo Valori, Alessandra Giunta, Miho Janvier, Nawin Ngampoopun, Teodora Mihailescu, Andy S. H. To, Lidia van Driel-Gesztelyi, Pascal Démoulin, Raffaella D’Amicis, Ryan J. French, Gabriel H. H. Suen, Alexis P. Rouillard, Rui F. Pinto, Victor Réville, Christopher J. Watson, Andrew P. Walsh, Anik De Groof, David R. Williams, Ioannis Zouganelis, Daniel Müller, David Berghmans, Frédéric Auchère, Louise Harra, Udo Schuehle, Krysztof Barczynski, Éric Buchlin, Regina Aznar Cuadrado, Emil Kraaikamp, Sudip Mandal, Susanna Parenti, Hardi Peter, Luciano Rodriguez, Conrad Schwanitz, Phil Smith, Luca Teriaca, Cis Verbeeck, Andrei N. Zhukov, Bart De Pontieu, Tim Horbury, Sami K. Solanki, Jose Carlos del Toro Iniesta, Joachim Woch, Achim Gandorfer, Johann Hirzberger, David Orozco Súarez, Thierry Appourchaux, Daniele Calchetti, Jonas Sinjan, Fatima Kahil, Kinga Albert, Reiner Volkmer, Mats Carlsson, Andrzej Fludra, Don Hassler, Martin Caldwell, Terje Fredvik, Tim Grundy, Steve Guest, Margit Haberreiter, Sarah Leeks, Gabriel Pelouze, Joseph Plowman, Werner Schmutz, Sunil Sidher, William T. Thompson, Philippe Louarn, Andrei Federov   +78 more
doaj   +1 more source

Solar active regions in Mg II light [PDF]

Symposium - International Astronomical Union, 1968
During 1965 two rockets were launched in order to obtain monochromatic pictures of the Sun in the Mg II line at 2802·7 Å. The Mg II filterheliograms have been compared with simultaneous Hα and Ca II K spectroheliograms. An important observation from both flights concerns the relative intensities of different active regions. In the Hα pictures there are
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EMISSION MEASURE DISTRIBUTION FOR DIFFUSE REGIONS IN SOLAR ACTIVE REGIONS [PDF]

The Astrophysical Journal, 2014
Our knowledge of the diffuse emission that encompasses active regions is very limited. In the present paper we investigate two off-limb active regions, namely AR10939 and AR10961, to probe the underlying heating mechanisms. For this purpose we have used spectral observations from Hinode/EIS and employed the emission measure (EM) technique to obtain the
Subramanian, Srividya, Tripathi, Durgesh, Klimchuk, James A., Mason, Helen E.   +3 more
openaire   +2 more sources

First Insights into the Applicability and Importance of Different 3D Magnetic Field Extrapolation Approaches for Studying the Preeruptive Conditions of Solar Active Regions

The Astrophysical Journal
The three-dimensional (3D) coronal magnetic field has not yet been directly observed. However, for a better understanding and prediction of magnetically driven solar eruptions, 3D models of solar active regions are required.
Marianna B. Korsós, Robert Jarolim, Robertus Erdélyi, Astrid M. Veronig, Huw Morgan, Francesca Zuccarello   +5 more
doaj   +1 more source