Results 51 to 60 of about 958,871 (209)

Photospheric magnetic vortex structures [PDF]

, 2011
Using direct numerical magneto-hydrodynamic (MHD) simulations, we demonstrate the evidence of two physically different types of vortex motions in the solar photosphere.
Shelyag, S., Keenan, Francis, F. P. Keenan, Fedun, V., Mathioudakis, Mihalis, Mathioudakis, M., M. Mathioudakis, Shelyag, Sergiy, Erdélyi, Robert, Keenan, F. P., Erdelyi, R., R. Erdélyi, S. Shelyag, V. Fedun, Fedun, Viktor   +14 more
core   +2 more sources

Solar Chromospheric Heating by Kinetic Alfvén Waves Based on the Three-fluid Model

The Astrophysical Journal
The heating mechanism of the solar chromosphere with a partially ionized plasma has been one of the challenging problems in solar physics. Kinetic Alfvén waves (KAWs) have been applied by many authors to study the heating of the corona and chromosphere ...
Jin-Run Ou, Ling Chen, De-Jin Wu, Chuan-Bing Wang   +3 more
doaj   +1 more source

Observations of small-scale energetic events in the solar transition region: explosive events, UV bursts, and network jets

Solar-Terrestrial Physics, 2019
In this paper, we review observational aspects of three common small-scale energetic events in the solar transition region (TR), namely TR explosive events, ultraviolet bursts and jets.
Zhenghua Huang, Bo Li, Lidong Xia
doaj   +1 more source

Extreme Red-wing Enhancements of UV Lines during the 2022 March 30 X1.3 Solar Flare

The Astrophysical Journal, 2023
Here, we present the study of a compact emission source during an X1.3 flare on 2022 March 30. Within a ∼41 s period (17:34:48 UT to 17:35:29 UT), Interface Region Imaging Spectrograph observations show spectral lines of Mg ii , C ii , and Si iv with ...
Yan Xu, Graham S. Kerr, Vanessa Polito, Nengyi Huang, Ju Jing, Haimin Wang   +5 more
doaj   +1 more source

Observing the Solar Chromosphere

, 2007
This review is split into two parts: one on chromospheric line formation in answer to the frequent question "where is my line formed", and one presenting state-of-the-art imagery of the chromosphere. In the first part I specifically treat the formation of the Na D lines, Ca II H & K, and Halpha.
openaire   +4 more sources

MORPHOLOGY AND DYNAMICS OF THE LOW SOLAR CHROMOSPHERE [PDF]

The Astrophysical Journal, 2009
accepted by ApJ, 16 pages, 8 ...
Wöger, F., Wedemeyer-Böhm, S., Uitenbroek, H., Rimmele, T. R.   +3 more
openaire   +2 more sources

Periodic Density Structures Observed in Ulysses Data: First Results

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Periodic density structures (PDSs) are advecting quasi‐periodic (periodicities between several minutes and several hours) density enhancements observed in the solar wind and corona. There is strong evidence that PDSs are formed at the Sun.
Brent M. Randol, Nicholeen Viall, Larry Kepko, Simone Di Matteo   +3 more
wiley   +1 more source

Effect of Magnetic Diffusion in the Chromosphere on the Solar Wind

The Astrophysical Journal
We investigate nonideal magnetohydrodynamical (MHD) effects in the chromosphere on the solar wind by performing MHD simulations for Alfvén-wave-driven winds, explicitly including ohmic and ambipolar diffusion.
Masato Matsuoka, Takeru K. Suzuki, Takato Tokuno, Kensuke Kakiuchi   +3 more
doaj   +1 more source

Structure of the Solar Atmosphere: A Radio Perspective

Frontiers in Astronomy and Space Sciences, 2020
Solar radio emission has been providing information about the Sun for over half a century. In order to fully exploit this information, one needs to have a broader view of the solar atmosphere, which cannot be provided by radio observations alone.
Costas E. Alissandrakis
doaj   +1 more source

Radiative Diagnostics in the Solar Photosphere and Chromosphere [PDF]

Space Science Reviews, 2016
Accepted for publication in Space Science Reviews.
J. de la Cruz Rodríguez, M. van Noort
openaire   +4 more sources