Results 121 to 130 of about 1,010,043 (218)

Multiwavelength Observations of Substructures in Solar Flare Ribbons

The Astrophysical Journal
Solar flare ribbons are extensive brightenings in the chromosphere during flares, often showing fine-scale structuring that reflects the underlying energy release. Using high-cadence imaging from the Swedish 1 m Solar Telescope/CRISP during an X1.5-class
Vishal Singh, Eamon Scullion, Gert J. J. Botha, Natasha L. S. Jeffrey, Malcolm Druett, Alexander G. M. Pietrow, Aidan O’Flannagain, Chris J. Nelson, Gerry Doyle   +8 more
doaj   +1 more source

Comparison between variations in solar UV radiation and sunspot parameters with Mg II daily index as a proxy

Physics Open
Solar UV radiation influence the Earth's climate and upper atmosphere. The UV emission from the Sun modulates with the sunspot cycle with an 11-year periodicity.
(G) Chandrika, Belur Ravindra, Vijay Kumar Doddamani   +2 more
doaj   +1 more source

WHAT DO IRIS OBSERVATIONS of Mg II k TELL US ABOUT THE SOLAR PLAGE CHROMOSPHERE?

, 2015
We analyze observations from the Interface Region Imaging Spectrograph of the Mg ii k line, the Mg ii UV subordinate lines, and the O i 135.6 $\mathrm{nm}$ line to better understand the solar plage chromosphere. We also make comparisons with observations
De Pontieu, Bart Walter, Leenaarts, Jorrit,, De Pontieu, Bart, Carlsson, Mats, Leenaarts, Jorrit   +4 more
core   +1 more source

Signatures of Sweet-Parker magnetic reconnection in the solar chromosphere

, 2009
Aims. Predicted and observed signatures of magnetic reconnection in the solar chromosphere are discussed. Methods. Compressible reconnection scalings for the Sweet-Parker current sheet in the chromosphere are derived, which generalize earlier ...
J. Chae, Y. E. Litvinenko
core   +1 more source

Rotation of Solar Chromosphere: A Global Perspective of Mg II Index during the Decay Phase of the Modern Maximum

The Astrophysical Journal
Rotation is one of the fundamental characteristics of the Sun, and it plays a crucial role in understanding the magnetic activities and dynamo processes.
Ruoxue Sha, Linhua Deng, Miao Wan, Xiaoyu Dong, Fuyu Li, Tingting Xu, Kunyan Wang   +6 more
doaj   +1 more source

Observational Evidence of Vortex-driven Information Transfer in the Solar Atmosphere: Insights from Sunrise iii

The Astrophysical Journal Letters
Using high-resolution observations from the TuMag instrument aboard the Sunrise iii solar observatory balloon mission, we investigate solar vortices in the lower atmosphere.
Suzana S. A. Silva, Ioannis Dakanalis, Kostas Tziotziou, Azaymi L. Siu-Tapia, Shahin Jafarzadeh, Shivdev Singh Turkay, Viktor Fedun, Sami K. Solanki, Andreas Lagg, Achim Gandorfer, Jose Carlos del Toro Iniesta, Yukio Katsukawa, Pietro Bernasconi, Thomas Berkefeld, Alex Feller, Tino L. Riethmüller, Alberto Álvarez-Herrero, Masahito Kubo, Valentín Martínez Pillet, H. N. Smitha, David Orozco Suárez, Bianca Grauf, Michael Carpenter, Alexander Bell, Francisco Javier Bailén, Julian Blanco Rodríguez, Juan Sebastián Castellanos Durán, Edvarda Harnes, Johannes Hoelken, Francisco A. Iglesias, Ryohtaroh T. Ishikawa, Yusuke Kawabata, Takuma Matsumoto, Takayoshi Oba, Hanna Strecker, Dušan Vukadinovic, Maria Balaguer Jiménez, Esteban Sanchis Kilders, Ignacio Torralbo, Christoph Kuckein   +39 more
doaj   +1 more source

On the dynamic nature of the prolate solar chromosphere: jet formation

, 2007
Context.In “cool” spectral lines, the smoothed upper edge of the solar chromosphere is prolate in the South-North direction at the epoch of minimum solar activity and nearly spherically symmetric at the maximum phase.
Koutchmy, S., S. Koutchmy, B. Filippov, J. Vilinga, Vilinga, J., Filippov, B.   +5 more
core   +1 more source

The New Chromosphere

, 2007
. The natural state of the Solar chromosphere is very dynamic. Any photospheric disturbance will grow and naturally form shocks over the twenty scale-heights in density between the photosphere and the corona.
Mats Carlsson, Robert F. Stein
core  

Alfvén Wave Heating of Solar Chromosphere Reexamined

The Astrophysical Journal
Models of heating the weakly ionized solar atmosphere by collisional damping of upward-propagating Alfvén waves, calculated under the assumption that only incompressible (intermediate-mode) MHD waves are involved, have predicted heating rates that do not
Vytenis M. Vasyliūnas
doaj   +1 more source

Measuring the magnetic fields in the chromospheres of low-mass stars. [PDF]

Nat Commun
Cang T, Petit P, Donati JF, Tian H, Fu J, Li H, Bellotti S, Hu X, Ma X, Lopez Ariste A, Xing K, Morin J, Lu H, Zong W.   +13 more
europepmc   +2 more sources