Search Publications

The Recovery of CME-Related Dimmings and the ICME's Enduring Magnetic Connection to the Sun

Zhukov, A. N.; Mandrini, C. H.; van Driel-Gesztelyi, L. +5 more

It is generally accepted that transient coronal holes (TCHs, dimmings) correspond to the magnetic footpoints of CMEs that remain rooted in the Sun as the CME expands out into the interplanetary space. However, the observation that the average intensity of the 12 May 1997 dimmings recover to their pre-eruption intensity in SOHO/EIT data within 48 h…

Modeling X-Ray Loops and EUV "Moss" in an Active Region Core

Winebarger, Amy R.; Warren, Harry P.; Falconer, David A.

The soft X-ray intensity of loops in active region cores and the corresponding footpoint, or moss, intensity observed in the EUV remain steady for several hours of observation. The steadiness of the emission has prompted many to suggest that the heating in these loops must also be steady, although no direct comparison between the observed X-ray an…

Net circular polarization of sunspots in high spatial resolution

Kubo, M.; Lites, B. W.; Ichimoto, K. +8 more

Context: Net circular polarization (NCP) of spectral lines in sunspots has been most successfully explained by the presense of discontinuities in the magnetic field inclination and flow velocity along the line-of-sight in the geometry of the embedded flux tube model of penumbrae (Δγ-effect).
Aims: The fine scale structure of NCP in a sunspot i…

Solar Mass Ejection Imager 3-D reconstruction of the 27-28 May 2003 coronal mass ejection sequence

Jackson, B. V.; Buffington, A.; Hick, P. P. +3 more

The Solar Mass Ejection Imager (SMEI) has recorded the inner-heliospheric response in white-light Thomson scattering for many hundreds of interplanetary coronal mass ejections (ICMEs). Some of these have been observed by the Solar and Heliospheric Observatory (SOHO) Large-Angle Spectroscopic Coronagraph (LASCO) instruments and also in situ by near…

Recent progress on ULF wave and its interactions with energetic particles in the inner magnetosphere

Pu, Z. Y.; Zong, Q. G.; Fritz, T. A. +4 more

On the edge of the foreshock: model-data comparisons

Dandouras, I.; Lucek, E.; Omidi, N. +1 more

We present the results of a global hybrid code simulation for the solar wind-interaction with the Earth's magnetosphere during an interval of steady radial IMF. The model predicts a foreshock marked by innumerable localized, correlated, and large amplitude, density and magnetic field strength variations, depressed velocities, and enhanced temperat…

The host of GRB 060206: kinematics of a distant galaxy

Vreeswijk, P. M.; Wijers, R. A. M. J.; Rol, E. +13 more

Context: GRB afterglow spectra are sensitive probes of interstellar matter along the line-of-sight in their host galaxies, as well as in intervening galaxies. The rapid fading of GRBs makes it very difficult to obtain spectra of sufficient resolution and S/N to allow for these kinds of studies.
Aims: We investigate the state and properties of …

Theoretical Fits of the δ Cephei Light, Radius, and Radial Velocity Curves

Marconi, Marcella; Bono, Giuseppe; Natale, Giovanni

We present a theoretical investigation of the light, radius, and radial velocity variations of the prototype δ Cephei. We find that the best-fit model accounts for luminosity and velocity amplitudes with an accuracy better than 0.8 σ, and for the radius amplitude with an accuracy of 1.7 σ. The chemical composition of this model suggests a decrease…

Variability-selected active galactic nuclei from supernova search in the Chandra deep field south

Boutsia, K.; Cappellaro, E.; Puccetti, S. +2 more

Context: Variability is a property shared by virtually all active galactic nuclei (AGNs), and was adopted as a criterion for their selection using data from multi epoch surveys. Low Luminosity AGNs (LLAGNs) are contaminated by the light of their host galaxies, and cannot therefore be detected by the usual colour techniques. For this reason, their …

The Initial Mass Function of the Stellar Association NGC 602 in the Small Magellanic Cloud with Hubble Space Telescope ACS Observations

Henning, Thomas; Gouliermis, Dimitrios A.; Dolphin, Andrew E. +1 more

We present our photometric study of the stellar association NGC 602 in the wing of the Small Magellanic Cloud (SMC). The data were taken in the filters F555W and F814W using the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). Photometry was performed using the ACS module of the stellar photometry package DOLPHOT. We de…