Results 91 to 100 of about 3,043 (224)

Photospheric high-frequency acoustic power excess in sunspot umbra: signature of magneto-acoustic modes [PDF]

, 2013
We present observational evidence for the presence of MHD (magnetohydrodynamic) waves in the solar photosphere deduced from SOHO/MDI (Solar and Heliospheric Observatory/Michelson Doppler Imager) Dopplergram velocity observations.
Shelyag, S., Thompson, Michael John, Zharkov, Sergei, Zharkov, S., M. J. Thompson, Fedun, V., S. Zharkov, Shelyag, Sergiy, Erdélyi, Robert, R. Erdélyi, Erdelyi, R., S. Shelyag, V. Fedun, Fedun, Viktor, Thompson, M.J.   +14 more
core   +1 more source

Zero-Field Dichroism in the Solar Chromosphere

Physical Review Letters, 2003
We explain the linear polarization of the Ca II infrared triplet observed close to the edge of the solar disk. In particular, we demonstrate that the physical origin of the enigmatic polarizations of the 866.2 nm and 854.2 nm lines lies in the existence of atomic polarization in their metastable lower levels, which produces differential absorption of ...
Sainz, R. Manso, Bueno, J. Trujillo
openaire   +3 more sources

Magnetohydrodynamic waves in structured atmospheres

, 2012
The effect of structuring, in the form of magnetic or density inhomogeneities, on the magnetohydrodynamic (mhd) waves of an infinite plasma is investigated.
Edwin, Patricia Mary
core  

Determining the Magnetic Field of Active Region Plages Using the Whole CLASP2/2.1 Spectral Window

The Astrophysical Journal
The Chromospheric LAyer SpectroPolarimeter missions, CLASP2 and CLASP2.1, demonstrated that the near-UV spectral region between 279.30 and 280.68 nm is suitable for studying the magnetism of the solar chromosphere.
David Afonso Delgado, Tanausú del Pino Alemán, Javier Trujillo Bueno, Ryohko Ishikawa, Ernest Alsina Ballester, David E. McKenzie, Luca Belluzzi, Christian Bethge, Ken Kobayashi, Takenori J. Okamoto, Laurel A. Rachmeler, Donguk Song, Jiří Štěpán, Bart de Pontieu, Adam R. Kobelski, Genevieve D. Vigil, Frédéric Auchère, Ryouhei Kano, Amy Winebarger   +18 more
doaj   +1 more source

Dynamics of the Quiet Solar Chromosphere [PDF]

, 1999
The solar chromosphere has never been static although it was often modeled so.Even the quiet-sun internetwork chromosphere has become thoroughly dynamic with the acoustic shock interpretation of the Ca II K 2V grains.
Rutten, R.J., Shine, R.A., Berger, T.E., Lites, Bruce W.   +3 more
core  

Impulsively generated two-fluid magnetoacoustic-gravity waves: Solar chromosphere heating and plasma outflows

, 2022
Context. We use a two-fluid model to study the heating of the solar chromosphere by magnetoacoustic and magnetoacoustic-gravity waves. In the model, we include energy dissipation as a result of ion–neutral collisions. Aims.
Poedts, Stefaan, K. Murawski, L. Kadowaki, Kadowaki, L., R. Niedziela, Niedziela, R., Murawski, K., Zaqarashvili, T., T. Zaqarashvili, S. Poedts   +9 more
core   +1 more source

Preferential Appearance of Hα Moreton Waves along Photospheric Magnetic Network Boundaries

The Astrophysical Journal Letters
Moreton waves are rare chromospheric signatures of large-scale coronal disturbances, often associated with big flares and coronal mass ejections. Using high-cadence, full-disk H α spectroscopic observations from Chinese H α Solar Explorer, together with ...
C. H. Zhai, Y. W. Ni, J. H. Guo, P. F. Chen   +3 more
doaj   +1 more source

A Unified Model of Solar Prominence Formation with Self-consistent Heating

The Astrophysical Journal
Several models have been proposed to explain the formation of solar prominences, among which the evaporation–condensation model and the direct injection model are the most popular ones.
C. J. Huang, Y. W. Ni, J. H. Guo, P. F. Chen   +3 more
doaj   +1 more source

Solar Flares and the Chromosphere

, 2010
5 pages, 3 ...
Fletcher, L., Turkmani, R., Hudson, H. S., Hawley, S. L., Kowalski, A., Berlicki, A., Heinzel, P.   +6 more
openaire   +2 more sources

Simulations of Alfvén and Kink wave driving of the solar chromosphere : efficient heating and spicule launching [PDF]

, 2016
Two of the central problems in our understanding of the solar chromosphere are how the upper chromosphere is heated and what drives spicules. Estimates of the required chromospheric heating, based on radiative and conductive losses, suggest a rate of ~0 ...
Brady, Christopher S., Arber, T. D.
core   +1 more source