Results 21 to 30 of about 285 (167)
3D Numerical Simulations of Solar Quiet Chromosphere Wave Heating [PDF]
The Astrophysical Journal Letters, 2020 Abstract Despite numerous observational and theoretical attempts, the heating problem of the solar chromosphere still remains unsolved. We develop a novel 3D two-fluid model that accounts for dynamics of charged species and neutrals, and use it to perform the numerical simulations of granulation driven jets and associated waves in a ...
K. Murawski, Z. E. Musielak, D. Wójcik
openaire +1 more source
The Magnetic Sensitivity of the (250–278 nm) Fe ii Polarization Spectrum
The Astrophysical Journal, 2023 This paper presents a theoretical investigation of the polarization and magnetic sensitivity of the near-ultraviolet (near-UV) solar spectral lines of Fe ii between 250 and 278 nm.
David Afonso Delgado +2 more
doaj +1 more source
The Heating of the Quiet Solar Chromosphere [PDF]
Symposium - International Astronomical Union, 1990 The quiet solar chromosphere shows three distinct regions. Ordered according to the strength of the emission from the low and middle chromosphere they are (1) the magnetic elements on the boundary of supergranulation cells, (2) the bright points in the cell interior, and (3) the truly quiet chromosphere, also in the cell interior. The magnetic elements
openaire +1 more source
The Brightness Temperature of the Quiet Solar Chromosphere at 2.6 mm [PDF]
Solar Physics, 2017 27 pages, 6 figures, accepted in publication of Solar ...
Kazumasa Iwai +6 more
openaire +2 more sources
Scattering polarization of molecular emission lines in the quiet solar chromosphere [PDF]
Astronomy & Astrophysics, 2002 We present scattering polarization measurements performed with THEMIS in July 2000 near the south polar limb. The low level of scattered light at THEMIS, which is the only large solar telescope to include a superpolished primary mirror, allows, in good seeing conditions, to observe the emission spectrum of the low chromosphere above the limb. These are,
M. Faurobert, J. Arnaud
openaire +1 more source
On the Magnetic Nature of Quiet-Sun Chromospheric Grains
The Astrophysical Journal Letters, 2023 Ca ii K grains, i.e., intermittent, short-lived (about 1 minute), periodic (2–4 minutes), pointlike chromospheric brightenings, are considered to be the manifestations of acoustic waves propagating upward from the solar surface and developing into shocks
María Jesús Martínez González +4 more
doaj +1 more source
Constraining the Systematics of (Acoustic) Wave Heating Estimates in the Solar Chromosphere
The Astrophysical Journal, 2023 Acoustic wave heating is believed to contribute significantly to the missing energy input required to maintain the solar chromosphere in its observed state.
Momchil E. Molnar +4 more
doaj +1 more source
Formation of the Lyman Continuum during Solar Flares
The Astrophysical Journal, 2023 The Lyman continuum (LyC;
Shaun A. McLaughlin +5 more
doaj +1 more source
Fine Structure of the Quiet Solar Chromosphere: Limb-Crossing Features
Solar Physics, 2001 In this article we study chromospheric structures (spicules) crossing the solar limb in Hα images corrected for limb darkening. This correction enabled us to view structures both on the disk and beyond the limb in the same image. The observations were obtained at the Sacramento Peak Observatory at Hα±0.75 A.
Zachariadis, Th. G. +4 more
openaire +3 more sources
The solar chromosphere at high resolution with IBIS [PDF]
Astronomy & Astrophysics, 2008 (Abridged) Aims: We characterize the dynamics of the quiet inter-network chromosphere by studying the occurrence of acoustic shocks and their relation with the concomitant photospheric structure and dynamics. Methods: We analyze a comprehensive data set that includes high resolution chromospheric and photospheric spectra obtained with the IBIS imaging ...
Vecchio, A., Cauzzi, G., Reardon, K. P.
openaire +2 more sources