Results 31 to 40 of about 72,949 (314)

Analytical Solution of the Hanle Effect in View of CLASP and Future Polarimetric Solar Studies

Atoms, 2019
We have solved a problem of the Hanle effect for the hydrogen Lyman- α line in an intuitive and straightforward way. The Stokes parameters amid an anisotropic radiation field and a magnetic field are derived as an analytical formula which ...
Motoshi Goto, Ryohko Ishikawa, Yusuke Iida, Saku Tsuneta   +3 more
doaj   +1 more source

The magnetic field in the solar atmosphere [PDF]

The Astronomy and Astrophysics Review, 2014
This publication provides an overview of magnetic fields in the solar atmosphere with the focus lying on the corona. The solar magnetic field couples the solar interior with the visible surface of the Sun and with its atmosphere. It is also responsible for all solar activity in its numerous manifestations.
Wiegelmann, T., Thalmann, J., Solanki, S.   +2 more
openaire   +3 more sources

Vorticity in the solar photosphere [PDF]

, 2010
Aims. We use magnetic and non-magnetic 3D numerical simulations of solar granulation and G-band radiative diagnostics from the resulting models to analyse the generation of small-scale vortex motions in the solar photosphere.Methods.
Shelyag, S., Keys, P.; id_orcid, Mathioudakis, Mihalis, Mathioudakis, M., Keenan, Francis, Shelyag, Sergiy, Keys, Peter, M. Mathioudakis, F. P. Keenan, Keenan, F. P., S. Shelyag, P. Keys   +11 more
core   +1 more source

Ultraviolet and extreme-ultraviolet emissions at the flare footpoints observed by atmosphere imaging assembly [PDF]

, 2013
A solar flare is composed of impulsive energy release events by magnetic reconnection, which forms and heats flare loops. Recent studies have revealed a two-phase evolution pattern of UV 1600 Å emission at the feet of these loops: a rapid pulse lasting ...
Klimchuk, J.A., Longcope, D.W., Liu, W.-J., Sturrock, Z., Qiu, J.   +4 more
core   +1 more source

Structures in the Outer Solar Atmosphere [PDF]

Space Science Reviews, 2014
The structure and dynamics of the outer solar atmosphere are reviewed with emphasis on the role played by the magnetic field. Contemporary observations that focus on high resolution imaging over a range of temperatures, as well as UV, EUV and hard X-ray spectroscopy, demonstrate the presence of a vast range of temporal and spatial scales, mass motions,
Fletcher, Lyndsay, Cargill, Peter J., Antiochos, Spiro K., Gudiksen, Boris V.   +3 more
openaire   +2 more sources

Polar mesosphere summer echoes during the July 2000 solar proton event [PDF]

, 2004
International audienceThe influence of the solar proton event (SPE) 14?16 July 2000 on Polar Mesosphere Summer Echoes (PMSE) is examined. PMSE were observed by the Esrange VHF MST Radar (ESRAD) at 67°53'N, 21°06'E.
V. Barabash, Feofilov, A., A. Feofilov, Kirkwood, S., Barabash, Victoria,, S. Kirkwood, A. Kutepov, Kutepov, A., Barabash, Victoria, Barabash, V.   +9 more
core   +1 more source

Effects of a mid-latitude solar eclipse on the thermosphere and ionosphere - A modelling study [PDF]

, 1998
A modelling study is presented which investigates in-situ generated changes of the thermosphere and ionosphere during a solar eclipse. Neutral temperatures are expected to drop by up to 40 degrees K at 240 km height in the totality footprint, with ...
Aylward, A. D., Muller-Wodarg, ICF, Müller-Wodarg, I. C. F., Aylward, AD, Lockwood, M, Lockwood M, Lockwood, Mike, Aylward AD, MullerWodarg ICF   +8 more
core   +1 more source

Existence of Purely Alvén Waves in Magnetic Flux Tubes with Arbitrary Cross-Sections

Physics, 2022
We study linear torsional Alfvén waves in a magnetic flux tube with an arbitrary cross-section. We assume that the equilibrium magnetic field is propagating in the z-direction in Cartesian coordinates x,y, and z.
Michael S. Ruderman, Nikolai S. Petrukhin   +1 more
doaj   +1 more source

Mesoscale Convective Systems and Extreme Precipitation on the West African Coast Linked to Ocean–Atmosphere Conditions during the Monsoon Period in the Gulf of Guinea

Atmosphere
This study investigates the importance of convective systems for extreme rainfall along the northern coast of the Gulf of Guinea (GG) and their relationship with atmospheric and oceanic conditions.
Sandrine Djakouré, Joël Amouin, Kouassi Yves Kouadio, Modeste Kacou   +3 more
doaj   +1 more source

Moreton waves and EUV waves in the solar atmosphere

地球与行星物理论评, 2023
Solar eruptions, which generate various types of wave phenomena in the solar atmosphere, are sources of space weather perturbations. These waves not only transport a large amount of energy, but also illuminate the properties of the magnetic field and ...
Pengfei Chen
doaj   +1 more source