Results 101 to 110 of about 14,496 (257)

Identifying Plasma Fractionation Processes in the Chromosphere Using IRIS

The Astrophysical Journal
The composition of the solar corona differs from that of the photosphere, with the plasma thought to fractionate in the solar chromosphere according to the first ionization potential (FIP) of the different elements.
David M. Long, Deborah Baker, Andy S. H. To, Lidia van Driel-Gesztelyi, David H. Brooks, Marco Stangalini, Mariarita Murabito, Alexander W. James, Mihalis Mathioudakis, Paola Testa   +9 more
doaj   +1 more source

Basal Chromospheric Flux and Maunder Minimum-type Stars: The quiet-Sun Chromosphere as a Universal Phenomenon

, 2012
Aims: We demonstrate the universal character of the quiet-Sun chromosphere among inactive stars (solar-type and giants). By assessing the main physical processes, we shed new light on some common observational phenomena.
Baliunas, Brandenburg, Buchholz, Cuntz, Cuntz, Duncan, Hall, Hauschildt, J. H. M. M. Schmitt, Judge, Judge, Judge, Judge, K.-P. Schröder, Keppens, Konstantinova-Antova, M. Cuntz, M. I. Pérez Martínez, M. Mittag, Mittag, Pasquini, Pevtsov, Pérez Martínez, Rammacher, Riethmüller, Schmitt, Schrijver, Schrijver, Schrijver, Schrijver, Schröder, Schröder, Schröder, Schwarzschild, Strassmeier, Stȩpień, Suzuki, Vögler, White, Wöger   +39 more
core   +1 more source

The Bright Rim Prominences according to 2.5D Radiative Transfer

The Astrophysical Journal Letters
Solar prominences observed close to the limb commonly include a bright feature that, from the perspective of the observer, runs along the interface between itself and the underlying chromosphere. Despite several idealized models being proposed to explain
Jack M. Jenkins, Christopher M. J. Osborne, Ye Qiu, Rony Keppens, Chuan Li   +4 more
doaj   +1 more source

The quiet chromosphere. Old wisdom, new insights, future needs

, 2010
The introduction to this review summarizes chromosphere observation in two figures. The first part showcases the historical emphasis on the eclipse chromosphere in the development of NLTE line formation theory and criticizes 1D modeling.
Rutten, Robert J.
core  

Magnetic fields of an active region filament from full Stokes analysis of Si I 1082.7 nm and He I 1083.0 nm

, 2012
Vector magnetic fields of an active region filament in the photosphere and upper chromosphere are obtained from spectro-polarimetric observations recorded with the Tenerife Infrared Polarimeter (TIP II) at the German Vacuum Tower Telescope (VTT).
A. Lagg, Asensio Ramos, Canou, Centeno, Collados, Georgoulis, Guo, Harvey, Kurucz, Lagg, Leroy, Lin, Lites, Lites, López Ariste, Merenda, Okamoto, Paletou, Rüedi, S. Solanki, Sasso, Socas-Navarro, Solanki, Trujillo Bueno, Wang, Y. Liu, Z. Xu   +26 more
core   +1 more source

Modeling the Solar Chromosphere

, 2007
Spectral diagnostic features formed in the solar chromosphere are few and difficult to interpret -- they are neither formed in the optically thin regime nor in local thermodynamic equilibrium (LTE). To probe the state of the chromosphere, both from observations and theory, it is therefore necessary with modeling.
openaire   +2 more sources

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

Atmospheric Heating and Wind Acceleration: Results for Cool Evolved Stars based on Proposed Processes

, 2014
A chromosphere is a universal attribute of stars of spectral type later than ~F5. Evolved (K and M) giants and supergiants (including the zeta Aurigae binaries) show extended and highly turbulent chromospheres, which develop into slow massive winds.
A. Brown, A. Chiavassa, A. Lobel, A. Lébre, A. Skumanich, A.D. McMurry, A.K. Dupree, B. Buchholz, B. Freytag, B. Pontieu De, B. Pontieu De, B. Pontieu De, B.E. Wood, C.-H. An, C.J. Schrijver, C.J. Schrijver, D. Fawzy, D. Rabin, D. Reimers, D.E. Osterbrock, D.F. Gray, D.J. Mullan, F.P. Pijpers, G.A. Gary, G.M. Harper, G.M. Harper, G.M. Harper, H. Alfvén, H. Peter, H. Peter, I. Pagano, J. Martínez-Sykora, J. Tu, J.A. Eaton, J.A. Eaton, J.D. Jackson, J.E. Leake, J.E. Leake, J.E. Leake, J.E. Leake, J.E. Vernazza, J.E. Vernazza, J.G. Doyle, J.G. Doyle, J.H. Piddington, J.L. Linsky, J.L. Linsky, J.M. Davila, J.M. Fontenla, J.M. Fontenla, J.V. Hollweg, J.V. Hollweg, K. Eriksson, K. Ohnaka, K.-P. Schröder, K.B. MacGregor, K.G. Carpenter, K.G. Carpenter, K.G. Carpenter, K.G. Carpenter, K.G. Strassmeier, L. Hartmann, L. Hartmann, L. Ofman, L. Ofman, L.S. Anderson, M. Auriére, M. Cuntz, M. Cuntz, M. Cuntz, M. Cuntz, M. Cuntz, M. Cuntz, M. Heinemann, M. Mathioudakis, M. Mitchner, M. Velli, M.C.M. Cheung, M.I. Pérez Martínez, M.L. Goodman, M.L. Goodman, M.L. Goodman, M.L. Khodachenko, M.R. Barkhudarov, M.S. Ruderman, N. Guerreiro, P. Charbonneau, P. Petit, P. Song, P. Ulmschneider, P. Ulmschneider, P.G. Judge, P.G. Judge, P.G. Judge, P.G. Judge, P.K. Shukla, R. Grappin, R. Lundin, R. Rosner, R. Rosner, R. Soler, R.A. Kopp, R.D. Robinson, R.G.M. Rutten, R.J. Morton, R.J. Morton, R.K. Konstantinova-Antova, R.K. Konstantinova-Antova, R.W Noyes, S. Tomczyk, S.B.F. Dorch, S.I. Braginskii, S.R. Cranmer, S.R. Cranmer, S.R. Cranmer, S.R. Cranmer, T. Simon, T. Tsuji, T.D. Arber, T.E. Holzer, T.K. Suzuki, T.K. Suzuki, T.K. Suzuki, T.R. Ayres, T.R. Ayres, T.R. Ayres, T.R. Ayres, U. Narain, U. Narain, U. Torkelsson, V. Hansteen, V. Krasnoselskikh, V.H. Hansteen, V.S. Airapetian, V.S. Airapetian, V.S. Airapetian, W.C. Danchi, W.H. Matthaeus, Y.-T. Lau, Z.E. Musielak   +139 more
core   +1 more source

Small-scale structure and dynamics of the lower solar atmosphere

, 2007
The chromosphere of the quiet Sun is a highly intermittent and dynamic phenomenon. Three-dimensional radiation (magneto-)hydrodynamic simulations exhibit a mesh-like pattern of hot shock fronts and cool expanding post-shock regions in the sub-canopy part
Avrett, Cauzzi, Friedrich Wöger, Kalkofen, Langangen, Leenaarts, Leenaarts, Sven Wedemeyer-Böhm, Tritschler, Wedemeyer, Wedemeyer-Böhm, Wilhelm, Wöger   +12 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