Results 11 to 20 of about 1,010,043 (218)

The Cold Heart of the Solar Chromosphere [PDF]

Symposium - International Astronomical Union, 1994
The early 1990's heralded the deployment of vastly improved space instruments in the ultraviolet (HST) and X-ray (ROSAT) bands, where thermal inhomogeneities in high-excitation chromospheres and coronae are seen in their most favorable light. The infrared spectrum provides a key complementary view of inhomogeneities, but only recently has begun to be ...
Ayres, Thomas (5284981), Ayres, Thomas
openaire   +4 more sources

NANOFLARE ACTIVITY IN THE SOLAR CHROMOSPHERE [PDF]

The Astrophysical Journal, 2014
We use ground-based images of high spatial and temporal resolution to search for evidence of nanoflare activity in the solar chromosphere. Through close examination of more than 10^9 pixels in the immediate vicinity of an active region, we show that the distributions of observed intensity fluctuations have subtle asymmetries.
Jess, D. B., Mathioudakis, M., Keys, P. H.   +2 more
openaire   +5 more sources

Why “Solar Tsunamis” Rarely Leave Their Imprints in the Chromosphere [PDF]

The Astrophysical Journal Letters, 2023
Solar coronal waves frequently appear as bright disturbances that propagate globally from the eruption center in the solar atmosphere, just like the tsunamis in the ocean on Earth.
Ruisheng Zheng, Yihan Liu, Wenlong Liu, Bing Wang, Zhenyong Hou, Shiwei Feng, Xiangliang Kong, Zhenghua Huang, Hongqiang Song, Hui Tian, Pengfei Chen, Robertus Erdélyi, Yao Chen   +12 more
doaj   +2 more sources

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

Scientific Reports, 2022
The anomalous heating of the solar upper atmosphere is one of the eight key problems in modern astronomy. Moreover, the stratification of the solar atmosphere is an outstanding key-problem in solar physics.
K. J. Li, J. C. Xu, W. Feng
doaj   +2 more sources

FARLEY-BUNEMAN INSTABILITY IN THE SOLAR CHROMOSPHERE [PDF]

The Astrophysical Journal, 2009
The Farley-Buneman instability is studied in the partially ionized plasma of the solar chromosphere taking into account the finite magnetization of the ions and Coulomb collisions. We obtain the threshold value for the relative velocity between ions and electrons necessary for the instability to develop.
Gogoberidze, Grigol, Voitenko, Y., Poedts, Stefaan, Goossens, Marcel   +3 more
openaire   +4 more sources

Solar mean magnetic field of the chromosphere [PDF]

Journal of Astrophysics and Astronomy, 2023
The Solar Mean Magnetic Field (SMMF) is the mean value of the line of sight (LOS) component of the solar vector magnetic field averaged over the visible hemisphere of the Sun. So far, the studies on SMMF have mostly been confined to the magnetic field measurements at the photosphere. In this study, we calculate and analyse the SMMF using magnetic field
M. Vishnu, K. Nagaraju, Harsh Mathur
openaire   +3 more sources

An Overall View of Temperature Oscillations in the Solar Chromosphere With ALMA [PDF]

Philosophical Transactions Series A, Mathematical, Physical, and Engineering Sciences, 2021
Samuel D T Grant, Richard J Morton, Bernhard Fleck   +2 more
exaly   +2 more sources

Insight into the Solar Plage Chromosphere with DKIST [PDF]

The Astrophysical Journal
The strongly coupled hydrodynamic, magnetic, and radiation properties of the plasma in the solar chromosphere make it a region of the Sun's atmosphere that is poorly understood. We use data obtained with the high-resolution Visible Broadband Imager (VBI)
David Kuridze, Han Uitenbroek, Friedrich Wöger, Mihalis Mathioudakis, Huw Morgan, Ryan Campbell, Catherine Fischer, Gianna Cauzzi, Thomas Schad, Kevin Reardon, João M. da Silva Santos, Christian Beck, Alexandra Tritschler, Thomas Rimmele   +13 more
doaj   +6 more sources

Chromospheric Jets and Their Properties [PDF]

Iranian Journal of Astronomy and Astrophysics, 2022
In this study we review solar chromospheric jets and characteristics of them. The chromosphere and transition region are the interface between the solar photosphere and the corona, which plays a key role in the formation and acceleration of the solar ...
Ehsan Tavabi, Sima Zeighami
doaj   +1 more source

The quiet sun at mm wavelengths as seen by ALMA

Frontiers in Astronomy and Space Sciences, 2022
Solar observations at sub-mm, mm and cm wavelengths offer a straightforward diagnostic of physical conditions in the solar atmosphere because they yield measurement of brightness temperature which, for optically thick features, equals intrinsic ...
Costas E. Alissandrakis, T. S. Bastian, Roman Brajša   +2 more
doaj   +1 more source