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Observational study of magnetic chirality of solar active regions
Zhang, H. Q.
We present the evolution of magnetic field and relationship with the magnetic (current) helicity in solar active regions from a series of photospheric vector magnetograms obtained at Huairou Solar Observing Station near Beijing, and also longitudinal magnetograms by MDI of SOHO, white light and 171 Å images by TRACE and soft X-ray images by Yohkoh…
Solar-like oscillations in red giants in the CoRoT exofield
De Ridder, J.; Barban, C.; Hekker, S. +4 more
Asteroseismic observations from space can provide us with long time series of uninterrupted high quality data for many stars at the same time. The CoRoT satellite (Convection Rota- tion and planetary Transits) was launched successfully in December 2006 and provides high precision photometery for a large number of stars. Here we present our researc…
A general Cluster data and global MHD simulation comparison
Daum, P.; Wild, J. A.; Taylor, M. G. G. T. +3 more
Among the many challenges facing the space weather modelling community today, is the need for validation and verification methods of the numerical models available describing the complex nonlinear Sun-Earth system. Magnetohydrodynamic (MHD) models represent the latest numerical models of this environment and have the unique ability to span the eno…
XMM-Newton: The next decade
Schartel, N.
Some key numbers about the XMM-Newton users, usage of the mission and the scientific outcome are provided. The background for selecting the topic, the preparation work, the organization and the corresponding committees are briefly described.
Emission from Large-Scale Jets in Quasars
Uchiyama, Yasunobu
We consider the emission processes in the large-scale jets of powerful quasars based on the results obtained with the VLA, Spitzer, Hubble, and Chandra. We show that two archetypal jets, 3C 273 and PKS 1136-135, have two distinct spectral components on large-scales: (1) the low-energy (LE) synchrotron spectrum extending from radio to infrared, and…
Grad-Shafranov and MHD Reconstructions
Hasegawa, Hiroshi; Sonnerup, Bengt U. O.; Teh, Wai-Leong
Since the publication of the multi-spacecraft data analysis book ISSI SR-001, new methods have been developed that allow field and plasma structures traversed by one or more spacecraft to be reconstructed in a region surrounding the spacecraft path from the measured data. Maps of field and plasma properties are created with the aid of various vers…
Calibration techniques for magnetometers implementing on-board de-spinning algorithms
Balogh, A.; Lucek, E.; Dunlop, M. W. +4 more
The Fluxgate Magnetometer experiments on-board the European Space Agency’s four spacecraft Cluster Mission have the capability to store sampled magnetic field vectors in the instrument memory, either as a full resolution ‘event capture’ or as spin-resolution vectors transformed into a non-spinning co-ordinate system (de-spun). The latter capabilit…
Ultrarelativistic Electrons in Jupiter's Inner Magnetosphere: First Observation of Angular Distributions in the 2.5 to 6 RJ Region
Armstrong, Thomas P.; Taherion, Saeed; Garrett, Henry B.
Jupiter has been recognized as a probable location of magnetically trapped ultrarelativistic electrons since its discovery as a source of polarized decimeter radio waves. A series of spacecraft (Pioneers 10 and 11, Voyagers 1 and 2, Ulysses, Cassini, and New Horizons) have flown by and orbited Jupiter with the goal of observing the trapped radiati…
Elemental Abundances of Energetic Particles within Magnetic Clouds Detected by Ulysses
Fränz, Markus; Krupp, Norbert; Woch, Joachim +1 more
The study of particles from the solar wind thermal population up to higher near-relativistic energies provides a tool to analyze and characterize the internal structure of magnetic clouds (MCs). In this work, we analyze the elemental composition of energetic particles at ~1 MeV nucleon-1. Statistically, using a data set of 40 MCs, we fi…
XMM-Newton operations beyond the 10-year design lifetime
Parmar, A. N.; Schartel, N.; Metcalfe, L. +2 more
In preparation for XMM-Newton operations beyond the 10-year design lifetime ESA instigated an independent review of all aspects of the mission. Unsurprisingly, the review found that the scientific interest in extending the mission is very high and likely to remain so in the foreseeable future. Most importantly, all the elements of the XMM-Newton m…