Results 41 to 50 of about 14,496 (257)

A Unified Picture of the FIP and Inverse FIP Effects [PDF]

, 2004
We discuss models for coronal abundance anomalies observed in the coronae of the sun and other late-type stars following a scenario first introduced by Schwadron, Fisk & Zurbuchen of the interaction of waves at loop footpoints with the partially neutral ...
Favata F., Feldman U., Henoux J.-C., J. Martin Laming, Leroy B., Marsch E., McKenzie J. F., Mewe R., Peter H., Peter H., Peter H., Vauclair S., von Steiger R.   +12 more
core   +2 more sources

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, Tanausú del Pino Alemán, Javier Trujillo Bueno   +2 more
doaj   +1 more source

The Impact of Multifluid Effects in the Solar Chromosphere on the Ponderomotive Force under SE and NEQ Ionization Conditions

The Astrophysical Journal, 2023
The ponderomotive force has been suggested to be the main mechanism to produce the so-called first ionization potential (FIP) effect—the enrichment of low-FIP elements observed in the outer solar atmosphere, in the solar wind, and in solar energetic ...
Juan Martínez-Sykora, Bart De Pontieu, Viggo H. Hansteen, Paola Testa, Q. M. Wargnier, Mikolaj Szydlarski   +5 more
doaj   +1 more source

The Role of Partial Ionization Effects in the Chromosphere

, 2015
The energy for the coronal heating must be provided from the convection zone. The amount and the method by which this energy is transferred into the corona depends on the properties of the lower atmosphere and the corona itself.
Carlsson, Mats, De Pontieu, Bart, Hansteen, Viggo H., Martinez-Sykora, Juan   +3 more
core   +1 more source

Solar science with the Atacama Large Millimeter/submillimeter Array - A new view of our Sun [PDF]

, 2015
The Atacama Large Millimeter/submillimeter Array (ALMA) is a new powerful tool for observing the Sun at high spatial, temporal, and spectral resolution.
Alissandrakis, C. E., Antolin, P., Ayres, T., Barta, M., Bastian, T., Benz, A. O., Black, J. H., Brajsa, R., De Pontieu, B., Doyle, J. G., Fleck, B., Fleishman, G., Gary, D., Gunar, S., Hauschildt, P., Heinzel, P., Hudson, H., Karlicky, M., Kato, Y., Kontar, E. P., Labrosse, N., Loukitcheva, M., Ludwig, H. -G., Nakariakov, V. M., Nindos, A., Perez, E., Scullion, E., Selhorst, C. L., Shimojo, M., Solanki, S. K., Soler, R., Tiwari, S. K., van der Voort, L. Rouppe, Van Doorsselaere, T., Wedemeyer, S., White, S. M., Yagoubov, P., Zaqarashvili, T.   +37 more
core   +2 more sources

Chromospheric Bubbles in Solar Flares [PDF]

The Astrophysical Journal Letters, 2020
Abstract We analyze a grid of radiative hydrodynamic simulations of solar flares to study the energy balance and response of the atmosphere to nonthermal electron beam heating. The appearance of chromospheric bubbles is one of the most notable features that we find in the simulations.
A. Reid, B. Zhigulin, M. Carlsson, M. Mathioudakis   +3 more
openaire   +4 more sources

Element Abundances in Impulsive Solar Energetic Particle Events

The Astrophysical Journal, 2023
We outline and discuss a model for the enhanced abundances of trans-Fe elements in impulsive solar energetic particle (SEP) events, where large mass-dependent abundance enhancements are frequently seen.
J. Martin Laming, Natsuha Kuroda
doaj   +1 more source

Chromospheric Prolateness: Solar Cycle Variations [PDF]

Proceedings of the International Astronomical Union, 2006
The solar prolateness (also known as Ovalisation, a french origin name) of the extended dynamical chromosphere is established from measurements performed above 2 Mm heights during the years of solar minimum, using the H$\alpha$, Ca II K and HeII 304 line emissions from both ground-based and space-based observations.
J. Vilinga, S. Koutchmy, Fr. Auchere, Fr. Baudin, B. Filippov, J-C. Noens   +5 more
openaire   +1 more source

Magnetoacoustic Heating of the Solar Chromosphere

The Astrophysical Journal, 1991
Long-period acoustic waves generated in the solar convection zone can propagate radially outward through the overlying atmosphere and get resonantly absorbed in the magnetic arches of the low-lying chromospheric canopy. The resulting Poynting and acoustic flux that enters the magnetic canopy in the network regions is demonstrated to be adequate to ...
Joseph M. Davila, S. M. Chitre
openaire   +1 more source

Parker Solar Probe Observations of Proton Core‐Beam Distributions in Heliospheric Current Sheet Region: Quasilinear Instability Analysis Combined With Collisional Relaxation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract Parker Solar Probe has been proven as instrumental for the observation of young solar wind. During the encounters E‐07 and E‐08, PSP recorded the core plus beaming protons crossing the heliospheric current Sheet region. When the observed PSP data is plotted in the temperature ratio versus parallel beta space, it is found that the occurrence ...
M. Rashid, P. H. Yoon, J. Huang, C. Salem, M. Sarfraz, S. Alnussirat, R. A. López, J. Seough, H. Xie, D. Larson, R. Livi   +10 more
wiley   +1 more source