Results 21 to 30 of about 3,053,596 (287)

GEANT4 SIMULATIONS OF GAMMA-RAY EMISSION FROM ACCELERATED PARTICLES IN SOLAR FLARES [PDF]

The Astrophysical Journal, 2010
Gamma-ray spectroscopy provides diagnostics of particle acceleration in solar flares, but care must be taken when interpreting the spectra due to effects of the angular distribution of the accelerated particles (such as relativistic beaming) and Compton reprocessing of the radiation in the solar atmosphere.
Tang, Shichao, Smith, David M.
openaire   +2 more sources

Laboratory astrophysics : investigation of planetary and astrophysical maser emission [PDF]

, 2013
This paper describes a model for cyclotron maser emission applicable to planetary auroral radio emission, the stars UV Ceti and CU Virginus, blazar jets and astrophysical shocks.
Ronald K, Phelps, A.D.R., Phelps, Alan, Kellett BJ, McConville SL, Phelps ADR, Speirs DC, Ronald, Kevin, McConville, S.L., Cross, Adrian, Cairns RA, Speirs, D.C., Cairns, R Alan, Cross, A.W., Cross AW, Kellett, Barry, McConville, Sandra, Cairns, R.A., Bingham, Robert, Vorgul I, Vorgul, Irena, Kellett, B.J., Ronald, K., Bingham R, Spiers DC, Vorgul, I., Speirs, David, Bingham, R., K. Ronald, B. J. Kellett, R. Bingham, A. W. Cross, S. L. McConville, I. Vorgul, D. C. Speirs, R. A. Cairns, A. D. R. Phelps   +36 more
core   +1 more source

Acceleration, Containment, and Emission of Very Low Energy Solar Flare Particles [PDF]

Symposium - International Astronomical Union, 1974
We present the first observations of protons down to 44 keV and electrons down to ≲ keV emitted in an impulsive solar particle event. The observations are from the Apollo 15 Subsatellite during a flare event which began on September 1, 1971. We obtain a lower limit estimate of the energy contained in ≳ MeV protons in the flare. The effects of adiabatic
R. P. Lin, R. E. McGuire, K. A. Anderson
openaire   +1 more source

Additional acceleration of solar-wind particles in current sheets of the heliosphere [PDF]

, 2015
Particles of fast solar wind in the vicinity of the heliospheric current sheet (HCS) or in a front of interplanetary coronal mass ejections (ICMEs) often reveal very peculiar energy or velocity profiles, density distributions with double or triple peaks,
V. Zharkova, Khabarova, Olga, V. Zharkova, O. Khabarova, Zharkova, Valentina   +4 more
core   +2 more sources

Dense suspension of solid particles as a new heat transfer fluid for concentrated solar thermal plants: on-sun proof of concept [PDF]

, 2013
This paper demonstrates the capacity of dense suspensions of solid particles to transfer concentrated solar power from a tubular receiver to an energy conversion process by acting as a heat transfer fluid.
Sans, Jean-Louis, Gauthier, Daniel, Boissière, Benjamin, Ansart, Renaud, Flamant, Gilles, Hemati, Mehrdji, Benoit, Hadrien, Garcia, Roger   +7 more
core   +1 more source

Statistical Study of the Correlation between Solar Energetic Particles and Properties of Active Regions

The Astrophysical Journal, 2023
The flux of energetic particles originating from the Sun fluctuates during the solar cycles. It depends on the number and properties of active regions (ARs) present in a single day and associated solar activities, such as solar flares and coronal mass ...
Russell D. Marroquin, Viacheslav Sadykov, Alexander Kosovichev, Irina N. Kitiashvili, Vincent Oria, Gelu M. Nita, Egor Illarionov, Patrick M. O’Keefe, Fraila Francis, Chun Jie Chong, Paul Kosovich, Aatiya Ali   +11 more
doaj   +1 more source

The role of alpha particles in the emission of plasma waves inside solar ejecta [PDF]

Brazilian Journal of Physics, 2002
The enhancement of the resonant instability of right-hand polarized electromagnetic ion cyclotron waves by alpha particles for physical parameters corresponding to coronal mass ejections is studied. We focus on the effects of alpha thermal anisotropy and relative He++/H+ abundance on growth and absorption rates.
Dasso, S., Gratton, F. T., Farrugia, Charlie J.   +2 more
openaire   +6 more sources

On solar protons and polar cap absorption: Constraints on an empirical relationship [PDF]

, 2004
International audienceA large database of Solar Proton Events (SPE) from the period 1995 to 2001 is used to investigate the relationship between proton flux at geostationary orbit and Cosmic Noise Absorption (CNA) in the auroral zone. The effect of solar
A. Senior, Senior, A., S. R. Marple, Kavanagh, A. J., A. J. Kavanagh, Marple, S. R., McCrea, I. W., F. Honary, I. W. McCrea, Honary, F.   +9 more
core   +2 more sources

Case study of the mesospheric and lower thermospheric effects of solar x-ray flares: Coupled ion-neutral modelling and comparison with EISCAT and riometer measurements [PDF]

, 2008
Two case studies of upper mesospheric and lower thermospheric (UMLT) high-latitude effects of solar X-ray flares are presented. Sodankylä Ion-neutral Chemistry Model (SIC) electron density profiles agree with D-region EISCAT and riometer ...
Beharrell, M.J., A. Seppälä, Verronen, P.T., Seppälä, A., Ulich, T., C.-F. Enell, Enell, C.-F., Honary, F., P. T. Verronen, J. P. Vierinen, T. Ulich, A. Kero, E. Turunen, M. J. Beharrell, Vierinen, J.P., Turunen, E., F. Honary, Kero, A.   +17 more
core   +2 more sources

Magnetic local time (MLT) dependence of auroral peak emission height and morphology [PDF]

Annales Geophysicae, 2022
We investigate the bulk behaviour of auroral structures and peak emission height as a function of magnetic local time (MLT). These data are collected from the Fennoscandian Lapland and Svalbard latitudes from seven identical auroral all-sky cameras (ASC)
N. Partamies, N. Partamies, D. Whiter, K. Kauristie, S. Massetti   +4 more
doaj   +1 more source