Search Publications
Evolution of morphological features of CMEs deduced from catastrophe model of solar eruptions
Lin, J.; Soon, W.
We describe the evolution of morphological features of the magnetic configuration of CME according to the catastrophe model developed previously. For the parameters chosen for the present work, roughly half of the total mass is nominally contained in the initial flux rope, while the remaining plasma is brought by magnetic reconnection from the cor…
X-ray sources and their optical counterparts in the globular cluster M 22
Rizzi, L.; Webb, N. A.; Barret, D. +3 more
Using XMM-Newton EPIC imaging data, we have detected 50 low-luminosity X-ray sources in the field of view of M 22, where 5±3 of these sources are likely to be related to the cluster. Using differential optical photometry, we have identified probable counterparts to those sources belonging to the cluster. Using X-ray spectroscopic and timing studie…
Observational evidence for velocity convergence toward magnetic neutral lines as a factor in CME initiation
Luhmann, Janet; Li, Yan; Fisher, George +1 more
One of the major challenges of space weather research and modeling is the identification of the mechanism(s) for coronal mass ejections (CMEs). A leading candidate tested in several recent numerical simulations is photospheric magnetic flux cancellation by velocity convergence toward the neutral line of an active region having sheared or twisted m…
Active Region Streamer Diagnostics 2001 September 14-16
Raymond, J. C.; Uzzo, M.; Ko, Y. -K.
From 2001 September 14 to 16 the Ultraviolet Coronal Spectrometer aboard the Solar and Heliospheric Observatory conducted a series of observations designed to study the absolute elemental abundances of an active region streamer. The absolute elemental abundances for O, Si, Fe, Mg, N, S, and Ar were calculated utilizing a constant electron temperat…
Modeling the Continuum Emission from the Circumstellar Environment of Herbig Ae/Be Stars
Elia, D.; Pezzuto, S.; Lorenzetti, D. +4 more
This paper discusses a model for the continuum emission of the Herbig Ae/Be stars in the light of an updated set of observational data spanning 5 orders of magnitude in wavelength and including the low-resolution spectra obtained with the Short Wavelength Spectrometer and Long Wavelength Spectrometer on board the Infrared Space Observatory (ISO). …
Multifractal structure of turbulence in the magnetospheric cusp
Popielawska, B.; Stasiewicz, K.; Grzesiak, M. +2 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2431.htm?FrameEngine=false;
High-frequency slowly drifting structures and X-ray sources observed by RHESSI
Krucker, S.; Karlický, M.; Fárník, F.
Three solar flares (April 4, 2002, May 17, 2002, and August 30, 2002) with the 0.4-2.0 GHz slowly drifting structures were selected and analyzed together with RHESSI X-ray observations. Two events (April 4, 2002 and May 17, 2002) were observed above and one event (August 30, 2002) close to the solar limb. While in April 4, 2002 and August 30, 2002…
Network boundary origins of fast solar wind seen in the low transition region?
Doyle, J. G.; Xia, L. D.; Popescu, M. D.
We present a study of a high spatial resolution raster acquired on-disk with the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) grating spectrograph on SoHO (the Solar and Heliospheric Observatory) in a polar Coronal Hole (CH) region. We analyse two EUV emission lines, representing the properties of solar plasma in the low transition …
Determination of the Rotation Curve for Stars of the Gould Belt Using Bottlinger's Formulas
Bobylev, V. V.
Based on the Hipparcos catalog and the radial velocities of stars published to date, we perform a kinematic analysis of OB stars. Parameters of the general Galactic rotation were determined from distant OB stars. We used the residual velocities of stars corrected for the general Galactic rotation to study the proper rotation of nearby OB stars. Ge…
Supernova Remnants in the Magellanic Clouds. IV. X-Ray Emission from the Largest Supernova Remnant in the Large Magellanic Cloud
Gruendl, R. A.; Smith, R. C.; Points, S. D. +4 more
We present the first X-ray detection of SNR 0450-70.9, the largest known supernova remnant (SNR) in the Large Magellanic Cloud. To study the physical conditions of this SNR, we have obtained XMM-Newton X-ray observations, optical images and high-dispersion spectra, and radio continuum maps. Optical images of SNR 0450-70.9 show a large, irregular e…