Search Constraints

Filtering by: Subject astrophysics Remove constraint Subject: astrophysics

Search Results

  • 3n204284r?file=thumbnail
    Article
    Cadavid, Ana Cristina
    Principal components analysis (PCA) and independent component analysis (ICA) are used to identify global patterns in solar and space data. PCA seeks orthogonal modes of the two-point correlation matrix constructed from a data set. It permits the ident . . .
  • Xk81jp769?file=thumbnail
    Conference paper or proceedings
    Lyra, Wladimir
    Large scale anticyclonic vortices concentrate solid material in disks and may thus behave as a route for fast planet formation. The debate over their 3D stability in recent years has lead to the conclusion that they are stable to 3D perturbations prov . . .
  • 7h149t29d?file=thumbnail
    Article
    Ferrara, Sergio
    The compactification of D=10 type IIA supergravity (the point-field theory limit of the type IIA superstring) on a Calabi-Yau manifold ((2.2) vacuum) is performed. The resulting D=4, N=2 effective supergravity Lagrangian gives rise to an explicit cons . . .
  • T722hd33d?file=thumbnail
    Article
    Jess, David B.
    The Rapid Oscillations in the Solar Atmosphere instrument reveals solar atmospheric fluctuations at high frequencies. Spectra of variations of the G-band intensity (IG ) and Ca IIK-line intensity (IK ) show correlated fluctuations above white noise to . . .
  • Pn89db138?file=thumbnail
    Article
    Oishi, Jeffrey S.
    Radial magnetic fields that resist orbital shear can explain the outwards angular momentum transport required for accretion in non-self-gravitating disks. This generates azimuthal magnetic fields and thus Maxwell stresses that transfer angular momentu . . .
  • 9c67wr31p?file=thumbnail
    Article
    Jing, Ju
    Filament eruptions and hard X-ray (HXR) source motions are commonly observed in solar flares, which provide critical information on the coronal magnetic reconnection. This Letter reports an event on 2005 January 15, in which we found an asymmetric fil . . .
  • G732dd534?file=thumbnail
    Book chapter
    Cadavid, Ana Cristina
    Principal components analysis (PCA) and independent component analysis (ICA) are used to identify global patterns in solar and space data. PCA seeks orthogonal modes of the two-point correlation matrix constructed from a data set. It permits the ident . . .
  • Work
    Article
    Cadavid, Ana Cristina
    We show that the interaction between planetary waves and the stratospheric zonal mean flow results in bi-modal (directreverse flow) or unimodal state depending on wave number of the waves. First we demonstrate this using a simple nonlinear dynamic sys . . .
  • 5m60qw36d?file=thumbnail
    Article
    Cadavid, Ana Cristina
    Many studies have pointed out fractal and multifractal properties of photospheric magnetic fields, but placing the various approaches into context has proved difficult. Although fractal quantities are defined mathematically in the asymptotic limit of . . .
  • Work
    Conference paper or proceedings
    McDonald, D.P.
    Quasi periodicities on scales of 1 to 2.5 years have been observed in solar, interplanetary and geomagnetic time series. The relation of these signals to 1 and 1.3 yr fluctuations in the solar interior suggest the presence of structures or characteris . . .