Results 91 to 100 of about 958,871 (209)

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

Observations of Locally Excited Waves in the Low Solar Atmosphere Using the Daniel K. Inouye Solar Telescope

The Astrophysical Journal Letters
We present an interpretation of the recent Daniel K. Inouye Solar Telescope (DKIST) observations of propagating wave fronts in the lower solar atmosphere.
Shah Mohammad Bahauddin, Catherine E. Fischer, Mark P. Rast, Ivan Milic, Friedrich Woeger, Matthias Rempel, Peter H. Keys, Thomas R. Rimmele   +7 more
doaj   +1 more source

The formation and stability of Petschek reconnection [PDF]

, 2014
E. R. Priest is grateful to the Leverhulme Trust. T. G. Forbes received support from NASA grant NNX-10AC04G to the University of New Hampshire. H. Baty acknowledges support by French National Research Agency (ANR) through Grant ANR-13-JS05-0003-01 ...
E. R. Priest, Priest, E.R., Baty, H., T. G. Forbes, Forbes, T.G., H. Baty   +5 more
core   +1 more source

Turbulence and Its Potential Impact on Solar Chromospheric and Coronal Heating

The Astrophysical Journal
Low-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, Xiaocan Li, K. Khanal, Alphonse C. Sterling, M. Nakanotani, L.-L. Zhao, L. Adhikari, M. Yalim, P. S. Athiray, Fan Guo, R. L. Moore   +10 more
doaj   +1 more source

Determining the Magnetic Field in the Atmosphere of a Solar Active Region Observed by the CLASP2.1 Sounding Rocket Experiment

The Astrophysical Journal
We determine magnetic fields from the photosphere to the upper chromosphere combining data from the Hinode satellite and the CLASP2.1 sounding rocket experiment.
Ryohko Ishikawa, Javier Trujillo Bueno, David E. McKenzie, Donguk Song, Tanausú del Pino Alemán, Ernest Alsina Ballester, Luca Belluzzi, Hao Li, Frédéric Auchère, Christian Bethge, Bart De Pontieu, Ryouhei Kano, Ken Kobayashi, Adam R. Kobelski, Takenori J. Okamoto, Laurel A. Rachmeler, Taro Sakao, Jiří Štěpán, Genevieve D. Vigil, Amy Winebarger   +19 more
doaj   +1 more source

A single frequency approach to nonequilibrium modeling of the chromosphere

Astronomy & Astrophysics
Context. The solar chromosphere is a region where radiation plays a critical role in energy transfer and interacts strongly with the plasma. In this layer, strong spectral lines, such as the Lyman lines, contribute significantly to radiative energy ...
Ruan W., Przybylski D., Cameron R., Solanki S. K.   +3 more
doaj   +1 more source

Observations of the upper solar chromosphere with SUMER

, 2003
The structure and dynamics of the solar chromosphere are still matters of debate. The chromospheric network reflecting the supergranulation of the outer convection zone of the Sun is a prominent feature of the lower solar atmosphere that extends into the
Kalkofen, W., K. Wilhelm, Wilhelm, K., W. Kalkofen   +3 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

Constraints on Acoustic Wave Energy Fluxes and Radiative Losses in the Solar Chromosphere from Non-LTE Inversions

The Astrophysical Journal
Accurately assessing the balance between acoustic wave energy fluxes and radiative losses is critical for understanding how the solar chromosphere is thermally regulated.
J. M. da Silva Santos, M. Molnar, I. Milić, M. Rempel, K. Reardon, J. de la Cruz Rodríguez   +5 more
doaj   +1 more source

The Solar Chromosphere [PDF]

Monthly Notices of the Royal Astronomical Society, 1933
openaire   +2 more sources