Results 21 to 30 of about 41,536 (207)

THE EXPANSION OF ACTIVE REGIONS INTO THE EXTENDED SOLAR CORONA [PDF]

The Astrophysical Journal Supplement Series, 2013
Advanced image processing of Large Angle and Spectrometric Coronagraph Experiment (LASCO) C2 observations reveals the expansion of the active region closed field into the extended corona. The nested closed-loop systems are large, with an apparent latitudinal extent of 50 Degree-Sign , and expanding to heights of at least 12 R{sub Sun }.
Huw Morgan, Lauren Jeska, Drew Leonard
openaire   +1 more source

The flaring and quiescent components of the solar corona

, 2008
The solar corona is a template to understand stellar activity. The Sun is a moderately active star, and its corona differs from active stars: active stellar coronae have a double-peaked EM(T) with the hot peak at 8-20 MK, while the non flaring solar ...
Argiroffi, Bornmann, C. Argiroffi, Cargill, Cargill, Drake, Elias, F. Reale, Favata, G. Peres, Garcia, Güdel, Güdel, Güdel, Hudson, Klimchuk, Kosugi, Marino, Masuda, Ness, Orlando, Orlando, Orlando, Parenti, Parker, Peres, Peres, Raassen, Reale, S. Orlando, Sanz-Forcada, Sanz-Forcada, Sanz-Forcada, Scelsi, Testa, Testa, Testa, Tsuneta, Vaiana, Walter   +39 more
core   +2 more sources

Statistical Properties of Magnetic Activity in the Solar Corona

The Astrophysical Journal, 1998
The long-time statistical behavior of a two-dimensional section of a coronal loop subject to random magnetic forcing is presented. The highly intermittent nature of dissipation is revealed by means of magnetohydrodynamic (MHD) turbulence numerical simulations. Even with a moderate magnetic Reynolds number, intermittency is clearly present in both space
GEORGOULIS M., VELLI M., EINAUDI, GIORGIO   +2 more
openaire   +2 more sources

Evolution of Elemental Abundances in Hot Active Region Cores from Chandrayaan-2 XSM Observations

The Astrophysical Journal, 2023
The first ionization potential (FIP) bias, whereby elemental abundances for low-FIP elements in different coronal structures vary from their photospheric values and may also vary with time, has been widely studied.
Biswajit Mondal, Santosh V. Vadawale, Giulio Del Zanna, N. P. S. Mithun, Aveek Sarkar, Helen E. Mason, P. Janardhan, Anil Bhardwaj   +7 more
doaj   +1 more source

Chromospheric Anemone Jets as Evidence of Ubiquitous Reconnection

, 2008
The heating of the solar chromosphere and corona is a long-standing puzzle in solar physics. Hinode observations show the ubiquitous presence of chromospheric anemone jets outside sunspots in active regions.
A. M. Title, B. W. Lites, Cirtain, H. Watanabe, K. Ichimoto, K. Otsuji, K. Shibata, Katsukawa, N. Nishizuka, Okamoto, R. A. Shine, R. Kitai, S. Nagata, S. Nozawa, S. Tsuneta, S. UeNo, T. D. Tarbell, T. E. Berger, T. J. Okamoto, T. Kawate, T. Matsumoto, T. Nakamura, T. Shimizu, Y. Katsukawa, Y. Suematsu   +24 more
core   +1 more source

The role of torsional Alfven waves in coronal heating [PDF]

, 2009
In the context of coronal heating, among the zoo of MHD waves that exist in the solar atmosphere, Alfven waves receive special attention. Indeed, these waves constitute an attractive heating agent due to their ability to carry over the many different ...
Antiochos, Antolin, Antolin, Antolin, Aschwanden, Aschwanden, Aschwanden, Aschwanden, Aschwanden, Brosius, Chae, Cranmer, Erdelyi, Hara, Heggland, Heyvaerts, Hori, K. Shibata, Kigure, Kudoh, Kudoh, Landini, Matsumoto, Mendoza-Briceño, Moriyasu, Muller, Musielak, Nakariakov, Ofman, P. Antolin, Patsourakos, Reale, Ruderman, Takeuchi, Taroyan, Tsuneta, Van Doorsselaere, Verth, Verth, Williams, Yokoyama   +40 more
core   +1 more source

A Large-Scale Dataset of Three-Dimensional Solar Magnetic Fields Extrapolated by Nonlinear Force-Free Method

Scientific Data, 2023
It has been widely accepted that solar magnetic field manipulates all solar activities, especially violent solar bursts in solar corona. Thus, it is extremely important to reconstruct three-dimentional (3D) magnetic field of solar corona from really ...
Zhongrui Zhao, Long Xu, Xiaoshuai Zhu, Xinze Zhang, Sixuan Liu, Xin Huang, Zhixiang Ren, Yonghong Tian   +7 more
doaj   +1 more source

The Magnetic Field Structure in the Active Solar Corona [PDF]

Symposium - International Astronomical Union, 1971
The structure of the magnetic field of the active solar corona is discussed with reference to optical and radio observations of the solar atmosphere. Eclipse observations provide evidence of fine scale structures in the solar atmosphere that appear to relate to the coronal magnetic field.
openaire   +1 more source

Subresolution activity in solar and stellar coronae from magnetic field line tangling [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
The heating of coronal loops is investigated to understand the observational consequences in terms of the thermodynamics and radiative losses from the Sun as well as the magnetized coronae of stars with an outer convective envelope. The dynamics of the Parker coronal heating model are studied for different ratios of the photospheric forcing velocity ...
A F Rappazzo, R B Dahlburg, G Einaudi, M Velli   +3 more
openaire   +2 more sources

Alfvén Wave Connection between the Chromosphere and the Corona of the Sun: An Analytical Study

The Astrophysical Journal, 2023
Alfvén waves are closely relevant to the three outstanding problems in the solar corona: coronal heating, solar wind acceleration, and the fractionization of low first ionization potential (FIP) elements.
Jongchul Chae, Kyoung-Sun Lee
doaj   +1 more source