Results 61 to 70 of about 682 (184)

Decent Estimate of CME Arrival Time From a Data‐Assimilated Ensemble in the Alfvén Wave Solar Atmosphere Model (DECADE‐AWSoM)

Space Weather, Volume 23, Issue 1, January 2025.
Abstract Forecasting the arrival time of Earth‐directed coronal mass ejections (CMEs) via physics‐based simulations is an essential but challenging task in space weather research due to the complexity of the underlying physics and limited remote and in situ observations of these events. Data assimilation techniques can assist in constraining free model
Hongfan Chen, Nishtha Sachdeva, Zhenguang Huang, Bart van der Holst, Ward Manchester IV, Aniket Jivani, Shasha Zou, Yang Chen, Xun Huan, Gabor Toth   +9 more
wiley   +1 more source

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

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

An overall view of temperature oscillations in the solar chromosphere with ALMA. [PDF]

Philos Trans A Math Phys Eng Sci, 2021
Jafarzadeh S, Wedemeyer S, Fleck B, Stangalini M, Jess DB, Morton RJ, Szydlarski M, Henriques VMJ, Zhu X, Wiegelmann T, Guevara Gómez JC, Grant SDT, Chen B, Reardon K, White SM.   +14 more
europepmc   +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

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

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 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

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

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