Search Publications
Helioseismic Constraints on the Gradient of Angular Velocity at the Base of the Solar Convection Zone
Kosovichev, A. G.
The layer of transition from the nearly rigid rotation of the radiative interior to the latitudinal differential rotation of the convection zone plays a significant role in the internal dynamics of the Sun. Using rotational splitting coefficients of the p-mode frequencies, obtained during 1986--1990 at the Big Bear Solar Observatory, we have found…
Intercombinations and Allowed Transitions in O IV
Judge, P. G.; Brekke, P.; Brage, Tomas
We report on large-scale ab initio multiconfiguration Hartree-Fock calculations for important multiplets including the UV 0.01 multiplet, 2s22p2PJ-2s2p2 4Pj', in O IV. The resulting transition probabilities should be accurate to ±5%-10% for intersystem lines and 1% or better for per…
Interpretation of the Observed Plasma ``Turbulent'' Velocities as a Result of Magnetic Reconnection in Solar Flares
Antonucci, Ester; Benna, Carlo; Somov, Boris V.
One of the distinctive features of magnetic reconnection in current sheets, which has been proposed as the primary energy source in solar flares, is the presence of fast plasma outflows, or jets, whose velocities are nearly equal to the Alfvén speed and depend mainly on the electron and ion temperatures inside the current sheet. We briefly discuss…
Enhancing the Spatial Resolution of Solar Coronagraph Observations Using Dynamic Imaging
Schwenn, R.; Howard, R. A.; Karovska, M. +4 more
The Large Angle Spectrometric Coronagraph (LASCO) Cl coronagraph on board the Solar and Heliospheric Observatory (SOHO) is designed to image the corona from 1.1 to 3.0 Rsun. The resolution of C1 is defined by the size of its CCD pixels, which correspond to 5".6, and not by the diffraction limit of the optical system, which may be as sma…