Results 121 to 130 of about 881 (218)
The Astrophysical JournalWe report on a flare-driven coronal rain event observed along postflare loops during the decay phase of an X1.6-class solar flare. Although high-resolution studies of flare-driven coronal rain have been conducted, imaging spectroscopic studies are rare ...
Donguk Song +8 more
doaj +1 more source
Chromospheric counterparts of solar transition region unresolved fine structure loops
, 2018 Low-lying loops have been discovered at the solar limb in transition region temperatures by the Interface Region Imaging Spectrograph (IRIS). They do not appear to reach coronal temperatures, and it has been suggested that they are the long-predicted ...
De Pontieu, Bart Walter +7 more
core +1 more source
, 2020 Context. Vortex flows exist across a broad range of spatial and temporal scales in the solar atmosphere. Small-scale vortices are thought to play an important role in energy transport in the solar atmosphere.
Yadav, N. +7 more
core +1 more source
The Astrophysical JournalUnderstanding the mechanisms underlying the heating of the solar atmosphere is a fundamental problem in solar physics. The lower atmosphere of the Sun (i.e., photosphere and chromosphere) is composed of weakly ionized plasma.
M. S. Yalim +6 more
doaj +1 more source
MHD mode conversion of fast and slow magnetoacoustic waves in the solar corona
, 2010 There are three main wave types present in the Sun’s atmosphere: Alfvén waves and fast and slow magnetoacoustic waves. Alfvén waves are purely magnetic and would not exist if it was not for the Sun’s magnetic field.
McDougall-Bagnall, A. M. Dee
core
The Astrophysical JournalModels currently fail to reproduce observations of the coldest regions in the Sun’s atmosphere, though recent work suggests the thermal Farley–Buneman instability (TFBI) may play a critical role.
Samuel Evans +3 more
doaj +1 more source
Transition Region Brightening in a Moss Region and Their Relation with Lower Atmospheric Dynamics
The Astrophysical JournalSmall-scale brightenings (SBs) are commonly observed in the transition region (TR) that separates the solar chromosphere from the corona. These brightenings, omnipresent in active region patches known as “moss” regions, could potentially contribute to ...
Bhinva Ram +7 more
doaj +1 more source
The signature of chromospheric heating in Ca II H spectra
, 2007 Context.The heating process that balances the solar chromospheric energy losses has not yet been determined. Conflicting views exist on the source of the energy and the influence of photospheric magnetic fields on chromospheric heating. Aims.We
C. Beck +3 more
core +1 more source
Spicules and their on-disk counterparts, the main driver for solar chromospheric heating?
, 2016 The question how the outer solar atmosphere is heated from solar photospheric temperatures of about 5800K up to solar chromospheric and coronal temperatures of about 20.000K and millions of degrees respectively, remained without any satisfying answer for centuries. On 4 May 2005, I recorded several time series of Halpha line scans with the GREGOR Fabry-
openaire +2 more sources
Turbulence and Its Potential Impact on Solar Chromospheric and Coronal Heating
The Astrophysical JournalLow-frequency turbulence in the solar chromosphere remains poorly understood. We address (1) the sources of low-frequency turbulence that potentially heat the chromosphere, and (2) how turbulence is transported and dissipated throughout the chromosphere ...
G. P. Zank +10 more
doaj +1 more source