Results 31 to 40 of about 41,638 (224)
Solar activity and its evolution across the corona: recent advances [PDF]
Journal of Space Weather and Space Climate, 2013 Solar magnetism is responsible for the several active phenomena that occur in the solar atmosphere. The consequences of these phenomena on the solar-terrestrial environment and on Space Weather are nowadays clearly recognized, even if not yet fully understood.
Zuccarello +18 more
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The Missing Cool Corona in the Flat Magnetic Field around Solar Active Regions [PDF]
The Astrophysical Journal, 2021 Abstract Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) images the full solar disk in several extreme-ultraviolet (EUV) bands that are each sensitive to coronal plasma emissions of one or more specific temperatures.
Talwinder Singh +2 more
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THE EXPANSION OF ACTIVE REGIONS INTO THE EXTENDED SOLAR CORONA [PDF]
The Astrophysical Journal Supplement Series, 2013 Advanced image processing of Large Angle and Spectrometric Coronagraph Experiment (LASCO) C2 observations reveals the expansion of the active region closed field into the extended corona. The nested closed-loop systems are large, with an apparent latitudinal extent of 50 Degree-Sign , and expanding to heights of at least 12 R{sub Sun }.
Huw Morgan, Lauren Jeska, Drew Leonard
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Statistical Properties of Magnetic Activity in the Solar Corona
The Astrophysical Journal, 1998 The long-time statistical behavior of a two-dimensional section of a coronal loop subject to random magnetic forcing is presented. The highly intermittent nature of dissipation is revealed by means of magnetohydrodynamic (MHD) turbulence numerical simulations. Even with a moderate magnetic Reynolds number, intermittency is clearly present in both space
GEORGOULIS M. +2 more
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The Astrophysical Journal, 2023 Coronal mass ejections (CMEs) can generate the most severe geomagnetic disturbances. One of the most critical factors affecting a CME’s geoeffectiveness is its trajectory. It is crucial to determine whether and when CME will hit Earth.
Grzegorz Michalek +3 more
doaj +1 more source
Evolution of Elemental Abundances in Hot Active Region Cores from Chandrayaan-2 XSM Observations
The Astrophysical Journal, 2023 The first ionization potential (FIP) bias, whereby elemental abundances for low-FIP elements in different coronal structures vary from their photospheric values and may also vary with time, has been widely studied.
Biswajit Mondal +7 more
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The flaring and quiescent components of the solar corona
, 2008 The solar corona is a template to understand stellar activity. The Sun is a moderately active star, and its corona differs from active stars: active stellar coronae have a double-peaked EM(T) with the hot peak at 8-20 MK, while the non flaring solar ...
Argiroffi +39 more
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The Magnetic Field Structure in the Active Solar Corona [PDF]
Symposium - International Astronomical Union, 1971 The structure of the magnetic field of the active solar corona is discussed with reference to optical and radio observations of the solar atmosphere. Eclipse observations provide evidence of fine scale structures in the solar atmosphere that appear to relate to the coronal magnetic field.
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Subresolution activity in solar and stellar coronae from magnetic field line tangling [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 The heating of coronal loops is investigated to understand the observational consequences in terms of the thermodynamics and radiative losses from the Sun as well as the magnetized coronae of stars with an outer convective envelope. The dynamics of the Parker coronal heating model are studied for different ratios of the photospheric forcing velocity ...
A F Rappazzo +3 more
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Scientific Data, 2023 It has been widely accepted that solar magnetic field manipulates all solar activities, especially violent solar bursts in solar corona. Thus, it is extremely important to reconstruct three-dimentional (3D) magnetic field of solar corona from really ...
Zhongrui Zhao +7 more
doaj +1 more source