Search Publications
XMM-Newton survey of non-thermal shell candidates: Preliminary results on DA 530
Bocchino, F.; Gallant, Y.; Bandiera, R.
The investigation of the general properties of non-thermal (NT) X-ray shell supernova remnants (SNRs), of which SN 1006 is the prototype, is important to understand how electrons are accelerated in SNR shocks and what is the origin of cosmic rays. Using the XMM-Newton satellite, we are carrying on a survey of putative non-thermal SNR candidates pr…
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…
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…
Plasma sheet oscillations and their relation to substorm development: Cluster and double star TC1 case study
Zhang, T. L.; Klecker, B.; Nakamura, R. +11 more
We examined two consecutive plasma sheet oscillation and dipolarization events observed by Cluster in the magnetotail, which are associated with a pseudo-breakup and a small substorm monitored by the IMAGE spacecraft. Energy input from the solar wind and an associated enhancement of the cross-tail current lead to current sheet thinning and plasma …
Evaluation of substorm models with Cluster observations of plasma flow reversal in the magnetotail
Dunlop, M. W.; Rème, H.; Lui, A. T. Y. +2 more
We evaluate two prevailing substorm models with an event of plasma flow reversal from tailward to Earthward detected by Cluster at the downstream distance of ∼19 RE in the magnetotail during a substorm on August 22, 2001. We use the unique capability of Cluster measurements in determining gradients to examine the associated current dens…
Catalogue of ionized emission line spectra in obscured AGN
Bianchi, S.; Guainazzi, M.; Salgado, J. +2 more
High-energy, high-resolution in the spatial and energy domains is crucial to derive the geometrical distribution and the physical properties of gas and dust surrounding Active Galactic Nuclei (AGN). These are, in turn, basic ingredients of any serious attempt to build an AGN structure model. We present in this paper CIELO-AGN, the first catalogue …
Coronal mass ejections acceleration problem
Wen, Yayuan; Wang, Jingxiu; Zhao, Hui +1 more
A statistical study of acceleration and its error of coronal mass ejections (CMEs) observed by the Large Angle Spectrometric Coronagraph (LASCO) is performed. A total of 5594 CMEs events have been analyzed by using a least-square method and using the error in the height measures. We verify that slower CMEs (velocities in the interval from 200 to 5…
Solar prominence properties derived from the UV-EUV SUMER spectral atlas
Vial, J. -C.; Parenti, S.; Lemaire, P.
In this paper, we summarize the work done to build a UV-EUV spectral atlas of a prominence and we introduce some recent scientific results obtained from these data. For this work we used SOHO/SUMER data covering the full wavelength range accessible by the instrument (from about 800 to 1600 Å), when a prominence and the quiet Sun (used as spectral …
Identification of spacecraft conjunctions in the cusps
Stubbs, T. J.; Keith, W. R.
The comparison of particle energy distributions from different altitudes in the cusp is important for developing our understanding of magnetospheric entry and energization processes. The Cluster multi-spacecraft mission allows the opportunity to better understand the features at higher altitudes, facilitating direct comparisons with concurrent low…
Mars Express/ASPERA-3/NPI and IMAGE/LENA observations of energetic neutral atoms in Earth and Mars orbit
Barabash, S.; Holmström, M.; Brinkfeldt, K. +3 more
The low energy neutral atom imagers on Mars Express and IMAGE have revealed that the neutral atom populations in interplanetary space come from a variety of sources and challenge our current understanding of heliospheric physics. For example, both in cruise phase and at Mars, the neutral particle instrument NPD on Mars Express observed “unexplaine…