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12 papers · 1 filter
Discriminating different scenarios to account for the cosmic excess by synchrotron and inverse Compton radiation
Juan Zhang, Xiao-jun Bi, Jia Liu +4
The excesses of the cosmic positron fraction recently measured by PAMELA and the electron spectra by ATIC, PPB-BETS, Fermi and H.E.S.S. indicate the existence of primary electron a…
Relative Spectra and Distributions of Fluences of 3He and 4He in Solar Energetic Particles
Vahe Petrosian, Yan Wei Jiang, Siming Liu +3
Solar Energetic Particles (SEPs) show a rich variety of spectra and relative abundances of many ionic species and their isotopes. A long standing puzzle has been the extreme enrich…
Search for Gravitational Wave Bursts from Soft Gamma Repeaters
LIGO Scientific Collaboration, S. Barthelmy, N. Gehrels +2
We present the results of a LIGO search for short-duration gravitational waves (GWs) associated with Soft Gamma Repeater (SGR) bursts. This is the first search sensitive to neutron…
Cascade and Damping of Alfvén-Cyclotron Fluctuations: Application to Solar Wind Turbulence Spectrum
Yan Wei Jiang, Siming Liu, Vahé Petrosian +1
With the diffusion approximation, we study the cascade and damping of Alfvén-cyclotron fluctuations in solar plasmas numerically. Motivated by wave-wave couplings and nonlinear eff…
Fast Spectral Fitting of Hard X-Ray Bremsstrahlung from Truncated Power-Law Electron Spectra
J. C. Brown, J. Kasparova, A. M. Massone +1
Hard X-Ray bremsstrahlung continuum spectra, such as from solar flares, are commonly described in terms of power-law fits, either to the photon spectra themselves or to the electro…
Invisible sunspots and rate of solar magnetic flux emergence
S. Dalla, L. Fletcher, N. A. Walton
We study the visibility of sunspots and its influence on observed values of sunspot region parameters. We use Virtual Observatory tools provided by AstroGrid to analyse a sample of…