Results 41 to 50 of about 152,015 (264)
Solar flares and energetic particles [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012 Solar flares are now observed at all wavelengths from γ -rays to decametre radio waves. They are commonly associated with efficient production of energetic particles at all energies. These particles play a major role in the active Sun because they contain a large amount of the energy released during flares ...
openaire +4 more sources
Energy release in solar flares [PDF]
Solar Physics, 1984 In early research on solar flares, attention was focused on the impulsíve or flash phase, and it was assumed implicitly that virtually all the energy of a flare is released during that short phase. In recent years, however, it has been realized that the long-lived soft X-ray emission which follows the impulsive phase may require a separate energy ...
P. A. Sturrock +3 more
openaire +3 more sources
Statistical properties of solar Hα flare activity
Journal of Space Weather and Space Climate, 2017 Magnetic field structures on the solar atmosphere are not symmetric distribution in the northern and southern hemispheres, which is an important aspect of quasi-cyclical evolution of magnetic activity indicators that are related to solar dynamo theories.
Deng Linhua +3 more
doaj +1 more source
Toward Model Compression for a Deep Learning–Based Solar Flare Forecast on Satellites
The Astrophysical Journal Supplement Series, 2023 Timely solar flare forecasting is challenged by the delay of transmitting vast amounts of data from the satellite to the ground. To avoid this delay, it is expected that forecasting models will be deployed on satellites.
Kai Feng +4 more
doaj +1 more source
New classification parameter of solar flares based on the maximum flux in soft X-rays and on duration of flare [PDF]
, 2018 Solar flare activity is characterised by different classification systems, both in optical and X-ray ranges. The most generally accepted classifications of solar flares describe important parameters of flares such as the maximum of brightness of the flare in the in optical range - $H_{\alpha}$ flare class (change from F to B), area of the flare in $H_{\
arxiv +1 more source
Flare differentially rotates sunspot on Sun's surface [PDF]
, 2016 Sunspots are concentrations of magnetic field visible on the solar surface (photosphere). It was considered implausible that solar flares, as resulted from magnetic reconnection in the tenuous corona, would cause a direct perturbation of the dense ...
Cao, Wenda +9 more
core +3 more sources
Vistas in Astronomy, 1974 When we look at a solar flare we observe at relatively close hand a sample of the most energetic phenomena in the universe. These dynamic eruptions can only truly be appreciated from time-lapse movies or spectra. They fill the interplanetary medium with cosmic rays and shock waves, and produce plasmas with temperatures of 50 million degrees.
openaire +2 more sources
E3S Web of Conferences, 2018 Intense X-ray fluxes during solar flares are known to cause enhanced ionization in the Earth’s ionospheric D, E and F region. This sudden change of ionospheric electron density profile is serious problem to radio wave communication and navigation system.
Fujimoto Akiko +2 more
doaj +1 more source
Evolution of coronal magnetic field parameters during X5.4 solar flare
Frontiers in Astronomy and Space Sciences, 2023 The coronal magnetic field over NOAA Active Region 11,429 during a X5.4 solar flare on 7 March 2012 is modeled using optimization based Non-Linear Force-Free Field extrapolation. Specifically, 3D magnetic fields were modeled for 11 timesteps using the 12-
Seth H. Garland +4 more
doaj +1 more source
Solar and Stellar Flares [PDF]
Highlights of Astronomy, 1989 AbstractThis review concentrates on some selected topics concerning the release of magnetic energy and associated phenomena in flares. Emphasis is on microflares, recent studies of different phases of flares, and propagation and trapping of flare accelerated electrons. The ongoing analysis of the observations of the previous solar cycle reaches a state
openaire +2 more sources