Results 11 to 20 of about 4,201 (186)
Heating mechanisms of the solar corona. [PDF]
Proc Jpn Acad Ser B Phys Biol Sci, 2017 The solar corona is a tenuous outer atmosphere of the Sun. Its million-degree temperature was discovered spectroscopically in the 1940s, but its origin has been debated since then without complete convergence. Currently there are two classes of models; the wave theory and the microflare/nanoflare theory.
Sakurai T.
europepmc +4 more sources
Astronomy & Astrophysics, 2023 Context. Vortex flows have been found in the photosphere, chromosphere, and low corona in observations and simulations. It has been suggested that vortices play an important role in channeling energy and plasma into the corona. However, the impact of vortex flows on the corona has not been studied directly in a realistic setup. Aims. We investigate the
C. Breu +3 more
openaire +5 more sources
Waves in the Solar Corona [PDF]
Symposium - International Astronomical Union, 2004 Waves at all scales, ranging in wavelength from the size of a loop (fraction of a solar radius) down to the gyroradii of coronal ions (about hundred meters), are believed to play a key role in the transport of mechanical energy from the chromosphere to the Sun's corona and wind, and through the dissipation of wave energy in the heating and sustaining ...
openaire +2 more sources
Slow solar wind acceleration through the middle corona: Spacecraft radio studies
Frontiers in Astronomy and Space Sciences, 2022 The “Middle Corona”, defined by recent consensus as the region spanning 1.5–6 solar radii (R⊙, heliocentric), is an important zone through which several structural and dynamic changes occur in coronal streamer regions. Among these is a regime change from
David B. Wexler +3 more
doaj +1 more source
Long term changes in EUV and X-ray emissions from the solar corona and chromosphere as measured by the response of the Earth’s ionosphere during total solar eclipses from 1932 to 1999 [PDF]
Annales Geophysicae, 2001 Measurements of the ionospheric E region during total solar eclipses in the period 1932–1999 have been used to investigate the fraction of Extreme Ultra Violet and soft X-ray radiation, 8, that is emitted from the limb corona and chromosphere.
C. J. Davis +5 more
doaj +1 more source
Turbulence in the solar corona
AIP Conference Proceedings, 2007 The solar corona has been revealed in the past decade to be a highly dynamic nonequilibrium plasma environment. Both the loop-filled coronal base and the extended acceleration region of the solar wind appear to be strongly turbulent, but direct observational evidence for a cascade of fluctuation energy from large to small scales is lacking.
openaire +2 more sources
The Astrophysical Journal, 2023 We investigate the origin of mesoscale structures in the solar wind called microstreams, defined as enhancements in the solar wind speed and temperature that last several hours.
Bahaeddine Gannouni +2 more
doaj +1 more source
ORFEES – a radio spectrograph for the study of solar radio bursts and space weather applications
Journal of Space Weather and Space Climate, 2021 Radio bursts are sensitive tracers of non-thermal electron populations in the solar corona. They are produced by electron beams and shock waves propagating through the corona and the heliosphere, and by trapped electron populations in coronal mass ...
Hamini Abdallah +10 more
doaj +1 more source