Results 11 to 20 of about 42,046 (150)
Symposium - International Astronomical Union, 1968 A model of solar flares is proposed in which the preflare state comprises a bipolar magnetic-field structure associated with a bipolar photospheric magnetic region. At low heights, the magnetic-field lines are closed but, at sufficiently great heights, the lines are drawn out into an open structure comprising a bipolar flux tube containing a ‘neutral ...
openaire +2 more sources
SCATTERING POLARIZATION IN SOLAR FLARES [PDF]
The Astrophysical Journal, 2013 There is an ongoing debate about the origin and even the very existence of a high degree of linear polarization of some chromospheric spectral lines observed in solar flares. The standard explanation of these measurements is in terms of the impact polarization caused by non-thermal proton and/or electron beams.
Jiri Stepan, Petr Heinzel
openaire +3 more sources
THE SOLAR FLARE IRON ABUNDANCE [PDF]
The Astrophysical Journal, 2012 The abundance of iron is measured from emission line complexes at 6.65 keV (Fe line) and 8 keV (Fe/Ni line) in {\em RHESSI} X-ray spectra during solar flares. Spectra during long-duration flares with steady declines were selected, with an isothermal assumption and improved data analysis methods over previous work.
Kjh Phillips, Brian R. Dennis
openaire +3 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
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
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
Collective acceleration in solar flares [PDF]
Physica Scripta, 1994 Solar flare data are examined with an eye to seeing if they suggest collective acceleration of ions. That, in fact, seems to be the case. The collective acceleration mechanism of Gershtein is reviewed and the possibilities of the mechanism are discussed.
Barletta, W +5 more
openaire +4 more sources
On the Performance of Multi-Instrument Solar Flare Observations During Solar Cycle 24 [PDF]
, 2017 The current fleet of space-based solar observatories offers us a wealth of opportunities to study solar flares over a range of wavelengths. Significant advances in our understanding of flare physics often come from coordinated observations between ...
Ireland, Jack, Milligan, Ryan O.
core +2 more sources
The effect of flares on total solar irradiance
, 2010 Flares are powerful energy releases occurring in stellar atmospheres. Solar flares, the most intense energy bursts in the solar system, are however hardly noticeable in the total solar luminosity.
AG Emslie +15 more
core +3 more sources
, 2015 Svestka (Solar Phys. 1989, 121, 399) on the basis of the Solar Maximum Mission observations introduced a new class of flares, the so-called flare hybrids.
Dubieniecki, P., Tomczak, M.
core +2 more sources