منابع مشابه
EISCAT observations of plasma patches at sub-auroral cusp latitudes
A sequence of 3 patches of high-density (1012 m−3) cold plasma on a horizontal scale-size of 300– 700 km was observed near magnetic noon by the EISCAT VHF radar above Svalbard on 17 December 2001. The patches followed a trajectory towards the cusp inflow region. The combination of radar and all-sky observations demonstrates that the patches must have been segmented equatorward of the cusp/cleft...
متن کاملMidday sub-auroral patches (MSPs) associated with interplanetary shocks
[1] We report a new category of dayside auroral transients using auroral image data from the Polar spacecraft Ultraviolet Imager. The transients are characterized by a sudden brightening of the auroral patch in the midday subauroral zone, and thus are named midday sub-auroral patches (MSPs). MSPs were found to occur concurrently with storm sudden commencements in response to the compression of ...
متن کاملGluon fragmentation into polarized charmonium.
Gluon fragmentation to χcJ(1P ) followed by single photon emission represents the dominant source of prompt J/Ψ’s at the Tevatron for p⊥>∼6 GeV. Since fragmenting gluons are approximately transverse, their products are significantly polarized. We find that gluon fragmentation populates the helicity levels of χc1, χc2 and J/Ψ according to D χ (h=0) c1 : D χ (|h|=1) c1 ≃ 1 : 1, D χ (h=0) c2 : D χ...
متن کاملGluon Fragmentation into Glueballs and
The constituent nature of candidate gluonic mesons can be studied by comparing their production in quark and gluon jets. The production rate for such mesons depends on the colour confinement processes at the end of the perturbative evolution. Whereas we expect enhanced production of hybrids in the fragmentation region of a gluon jet, the rate for glueballs depends on the relative importance of ...
متن کاملGluon fragmentation into heavy quarkonium.
The dominant production mechanism for heavy quark-antiquark bound states in very high energy processes is fragmentation, the splitting of a high energy parton into a quarkonium state and other partons. We show that the fragmentation functions D(z, μ) describing these processes can be calculated using perturbative QCD. We calculate the fragmentation functions for a gluon to split into S-wave qua...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2014
ISSN: 2169-9380
DOI: 10.1002/2014ja020050