344 research outputs found
Detecting Solar Neutrino Flare in Megaton and km^3 detectors
To foresee a solar flare neutrino signal we infer its upper and lower bound.
The upper bound was derived since a few years by general energy equipartition
arguments on observed solar particle flare. The lower bound, the most
compelling one for any guarantee neutrino signal, is derived by most recent
records of hard Gamma bump due to solar flare on January 2005 (by neutral pion
decay).The observed gamma flux reflects into a corresponding one for the
neutrinos, almost one to one. Therefore we obtain minimal bounds already at the
edge of present but quite within near future Megaton neutrino detectors. Such
detectors are considered mostly to reveal cosmic supernova background or rare
Local Group (few Mpc) Supernovas events. However Megaton or even inner ten
Megaton Ice Cube detector at ten GeV threshold may also reveal traces of solar
neutrino in hardest energy of solar flares. Icecube, marginally, too. Solar
neutrino flavors may shine light on neutrino mixing angles.Comment: 4 pages,4 figure
Mass spectrometry measurements of the lower atmosphere of Venus
Mass spectrometer experiments installed on the descent vehicles of the Venera-11 and the Venera-12 are described. Data on the chemical composition of the lower atmosphere of Venus is discussed with emphasis on the isotope state of the basic components (carbon, oxygen, nitrogen) and of the inert gases
Influence of magnetic anisotropy on hysteresis behavior in the two-spin model of a ferro/antiferromagnet bilayer with exchange bias
The influence of magnetic anisotropy of a ferromagnetic film on the phenomenon of exchange bias is studied here. Hysteresis behavior in the two-spin model of a ferro/antiferromagnetic (FM/AFM) bilayer with exchange bias has been investigated in detail. In this model a half-space of an AFM with fixed magnetic configuration comes in contact with a two-layer FM film. Twelve different types of magnetization curves M(H) (both with and without hysteresis) have been found. Some of the M(H) curves demonstrate unusual features, such as plateaus and inclined segments. The hysteresis loop becomes asymmetric if surface anisotropy is taken into account
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