Results 121 to 130 of about 14,687 (203)

Solar wind helium enhancements following major solar flares [PDF]

The observations of solar wind helium enhancements following major solar flares are reviewed, and the hypothesis that helium enhancements often mark flare piston plasma is confirmed.
Hirshberg, J.
core   +1 more source

Picoflares in the Quiet Solar Corona: Solar Orbiter Observations Halfway to the Sun

13 pages, 7 figures, submitted to Astronomy & Astrophysics (A&A)
Podladchikova, O., Warmuth, A., Harra, L., Dolla, L., Verbeeck, C., Mierla, M., Rodriguez, L., Parenti, S., Georgoulis, M. K., Hofmeister, S. J., Engler, N., West, M. J., Veronig, A. M., Antolin, P., Purkhart, S., Long, D. M., Buchlin, É., Haberreiter, M., Zhukov, A. N., Safari, H., Battaglia, A. F., Soubrié, E., Büchel, V., Gissot, S., De Groof, A., Gyo, M., Halain, J. P., Inhester, B., Kraaikamp, E., Müller, D., Pfiffner, D., Rochus, P., Schuller, F., Smith, P. J., Schmutz, W., Stegen, K.   +35 more
openaire   +2 more sources

Source Region of the Solar Wind: Statistics of the Doppler Velocities at the Chromosphere

The Astrophysical Journal Letters
The solar wind has been extensively studied recently with in situ observations, and the understanding of its counterpart near the solar surface has also progressed significantly.
Fu Yu, Shihao Rao, Jie Zhao, Chuan Li, Yang Su, Jinsong Zhao, Ye Qiu, Mingde Ding, Cheng Fang, Hui Li, Weiqun Gan   +10 more
doaj   +1 more source

Laboratory studies in ultraviolet solar physics [PDF]

The research activity comprised the measurement of basic atomic processes and parameters which relate directly to the interpretation of solar ultraviolet observations and to the development of comprehensive models of the component structures of the solar
Gardner, L. D., Kohl, J. L., Parkinson, W. H., Raymond, J. C., Smith, P. L.   +4 more
core   +1 more source

What Determines the Brightness of the Magnetically Open Solar Corona?: Insights from Three-dimensional Radiative Magnetohydrodynamic Simulations and Observations

The Astrophysical Journal
We investigate the relationship between solar coronal holes and open-field regions using three-dimensional radiative magnetohydrodynamic simulations combined with remote-sensing observations from the Solar Dynamics Observatory (SDO).
Haruhisa Iijima
doaj   +1 more source

The role and contribution of magnetic fields, characterized via their magnetic flux, to the statistical structuring of the solar atmosphere. [PDF]

Sci Rep, 2022
Li KJ, Xu JC, Feng W.
europepmc   +1 more source

High Resolution Telescope and Spectrograph (HRTS) [PDF]

The major objectives of the high resolution telescope and spectrograph (HRTS) are: (1) the investigation of the energy balance and mass balance of the temperature minimum, chromosphere, transition zone, and corona in quiet regions on the Sun as well as ...
Moore, R. L.
core   +1 more source

Extreme-ultraviolet transient brightenings in the quiet-Sun corona

Astronomy & Astrophysics
Context. The extreme-ultraviolet (EUV) brightenings identified by Solar Orbiter, commonly known as campfires, are the smallest transient brightenings detected to date outside active regions in the solar corona. Aims. In order to understand their possible contribution to quiet-Sun heating, we investigated the spatio-temporal distribution of a large ...
Nancy Narang, Cis Verbeeck, Marilena Mierla, David Berghmans, Frédéric Auchère, Sergei Shestov, Véronique Delouille, Lakshmi Pradeep Chitta, Eric Priest, Daye Lim, Laurent R. Dolla, Emil Kraaikamp   +11 more
openaire   +2 more sources

3D MHD Simulations of Coronal Loops Heated via Magnetic Braiding. I. Continuous Driving

The Astrophysical Journal
The nature and detailed properties of the heating of the million-degree solar corona are important issues that are still largely unresolved. Nanoflare heating might be dominant in active regions and quiet Sun, although direct signatures of such small ...
G. Cozzo, Paola Testa, J. Martinez-Sykora, F. Reale, P. Pagano, F. Rappazzo, V. Hansteen, B. De Pontieu, A. Petralia, E. Alaimo, F. Fiorentino, F. D’Anca, L. Sciortino, M. Todaro, U. Lo Cicero, M. Barbera   +15 more
doaj   +1 more source

A Unified Picture of Swirl-driven Solar Coronal Heating: Magnetic Energy Supply and Dissipation

The Astrophysical Journal Letters
The coronal heating problem is one of the most critical challenges in solar physics. Recent observations have revealed that small-scale swirls are ubiquitous in the photosphere and chromosphere, suggesting that they may play a significant role in ...
Hidetaka Kuniyoshi, Shinsuke Imada, Takaaki Yokoyama   +2 more
doaj   +1 more source