Results 1 to 10 of about 884 (164)
Differential rotation: the chromosphere to the quiet chromosphere
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT Synoptic maps of Ca II K-normalized intensity at ±40° latitude belt from Carrington rotations 827 (1915 August 10) to 1764 (1985 July 7) are utilized to investigate the long-term variation of the quiet chromospheric differential rotation within solar activity cycles through removing some large values of Ca II-normalized ...
J C Xu, X J Shi, N B Xiang
exaly +2 more sources
The mystery of the chromosphere [PDF]
Solar Physics, 1996 We discuss many aspects of the solar chromosphere from an observational point of view, and show that most existing models are in direct contradiction to radio and eclipse measurements. We plead for attention to the actual observed radio temperatures and density gradients, as well as images of the chromosphere.
Zirin Harold
exaly +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 S Jafarzadeh, S Wedemeyer, B Fleck
exaly +2 more sources
A Comparison Between Cool Chromospheric and Hot Coronal Jets [PDF]
Iranian Journal of Astronomy and Astrophysics, 2023 The similarities between Ca and x-ray jets suggest that their formation mechanism should be the same. Surges are almost cool plasma jets and are usually observed in Hα at ground-based observation, space observations also detect Surges.
Ehsan Tavabi, Azam Mollatayefeh
doaj +1 more source
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
Physical Properties of Radio Stars Based on LAMOST Spectral Survey
Universe, 2022 Radio emission has been detected for all types of stars in the Hertzsprung Russell diagram. Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low and medium-resolution spectroscopic surveys provide a good opportunity to obtain the ...
Liyun Zhang +6 more
doaj +1 more source
Frontiers in Astronomy and Space Sciences, 2023 The flare activity of the Sun has been studied for decades, using both space- and ground-based telescopes. The former have mainly focused on the corona, while the latter have mostly been used to investigate the conditions in the chromosphere and ...
Alberto Sainz Dalda +4 more
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 +2 more
doaj +1 more source
Moreton waves and EUV waves in the solar atmosphere
地球与行星物理论评, 2023 Solar eruptions, which generate various types of wave phenomena in the solar atmosphere, are sources of space weather perturbations. These waves not only transport a large amount of energy, but also illuminate the properties of the magnetic field and ...
Pengfei Chen
doaj +1 more source
Review of Fast Solar Jets and Coronal Mass Ejections [PDF]
Iranian Journal of Astronomy and Astrophysics, 2023 The Sun is a magnetically active star. It has a powerful magnetic field that shifts slightly from year to year until it reverses about every eleven years. The sun's magnetic field has many effects, the collection of which is called solar activity such as,
Sima Zeighami, Ehsan Tavabi
doaj +1 more source