Search Publications
XMM-Newton observations of the Mouse, SLX 1744 299 and SLX 1744 300
Maeda, Yoshitomo; Pavlov, George G.; Mori, Hideyuki +2 more
We observed the radio and X-ray source G359.23-0.82, also known as "the Mouse", with XMM-Newton. The X-ray image of this object shows a point-like source at the Mouse's "head", accompanied by a "tail" that extends for about 40″ westward. The morphology is consistent with that observed recently with Chandra [Gaensler, B.M., van der Swaluw, E., Cami…
Energetic particle signatures of geoeffective coronal mass ejections
Laitinen, T.; Valtonen, E.; Huttunen-Heikinmaa, K.
We have studied statistically associations of moderate and intense geomagnetic storms with coronal mass ejections (CMEs) and energetic particle events. The goal was to identify specific energetic particle signatures, which could be used to improve the predictions of the geoeffectiveness of full and partial halo CMEs. Protons in the range 1-110 MeV…
On the determination of energy spectra of MeV electrons by the Ulysses COSPIN/KET
Fichtner, H.; Ferreira, S. E. S.; Heber, B. +1 more
The Ulysses mission has provided a wealth of data, particularly regarding the transport of low-energy cosmic ray electrons. These data have been used to derive significant constraints for the anisotropic spatial diffusion of these particles. Detailed model simulations allowed, in addition, to determine the relative contributions of galactic and Jo…
Structure of the interplanetary magnetic field during the interval spanning the first Cassini fly-through of Saturn’s magnetosphere and its implications for Saturn’s magnetospheric dynamics
Jackman, C. M.; Milan, S. E.; Cowley, S. W. H. +2 more
We examine the interplanetary magnetic field (IMF) data obtained by the Cassini spacecraft during a 5 month period spanning the first fly-through of Saturn's magnetosphere, this interval corresponding to six solar rotations at the spacecraft. It is shown that the structure of the interplanetary medium was consistent with expectations for the decli…
Comparison of the effects of two models for perpendicular diffusion on cosmic-ray latitudinal gradients
Matthaeus, W. H.; Bieber, J. W.; Burger, R. A. +2 more
We compare the effects of two different models for perpendicular diffusion on the latitudinal gradients of galactic cosmic ray protons during solar minimum conditions. These two models correspond to the newly developed non-linear guiding center theory [Matthaeus, W.H., Qin, G., Bieber, J.W., Zank, G.P. Nonlinear collisionless perpendicular diffusi…
Probing the dark matter profile of hot clusters and the M- T relation with XMM- Newton
Arnaud, M.; Pointecouteau, E.; Pratt, G. W.
We present results based on XMM- Newton observations of a small sample of hot galaxy clusters. Making a full use of XMM- Newton's spectro-imaging capabilities, we have extracted the radial temperature profile and gas density profile, and with this information, calculated the total mass profile of each cluster (under the assumption of hydrostatic e…
Centre-to-limb variation of photospheric facular radiance and image resolution
Domingo, Vicente; Ortiz, Ada; Sanahuja, Blai +1 more
We study the effect of the angular resolution on the determination of the angular properties of the facular radiance. We analyze photospheric intensity in the continuum, around the Ni 676.8 nm line, and longitudinal magnetic field along the line of sight, measured by the MDI instrument aboard SOHO with two spatial resolutions, 4″ and 1.2″ (2″ and …
One-up on L1: Can X-rays provide longer advanced warning of solar wind flux enhancements than upstream monitors?
Kuntz, K. D.; Snowden, S. L.; Collier, M. R. +1 more
Observations of strong solar wind proton flux correlations with ROSAT X-ray rates along with high spectral resolution Chandra observations of X-rays from the dark Moon show that soft X-ray emission mirrors the behavior of the solar wind. In this paper, based on an analysis of an X-ray event observed by XMM-Newton resulting from charge exchange of …
Solar cycle evolution of the contrast of small photospheric magnetic elements
Ortiz, Ada
Solar irradiance variations produced on the solar rotation time-scale are known to be driven by the passage of active regions while, during the last years, the origin of variations on the solar cycle time-scale has been under debate. Nowadays, there is an agreement that the magnetic network has an important contribution to these long-term variatio…
Model of the all-sky He II 30.4 nm solar flux
Auchère, F.; von Steiger, R.; Witte, M. +3 more
Because of the orbit characteristics of the vast majority of spacecraft, the solar flux has been generally measured at Earth or in the plane of the ecliptic. So far, most published studies did not consider the fact that the extreme ultraviolet (EUV) solar flux is largely anisotropic. Indeed, in the EUV, the distribution of very contrasted bright a…