Search Publications
Measuring and understanding space turbulence
Belmont, Gérard; Rezeau, Laurence; Sahraoui, Fouad
For many physical issues including reconnection, the role of waves and turbulence is likely to be predominant in space physics. This role can be viewed as a natural consequence of the general properties of turbulence, but these properties, although widely recognized in hydrodynamics, are much less familiar in plasmas. The connections between the d…
Modeling accelerated pick-up ion distributions at an interplanetary shock
Baring, Matthew G.; Summerlin, Errol J.
The acceleration of interstellar pick-up ions as well as solar wind species has been observed at a multitude of interplanetary (IP) shocks by different spacecraft. The efficiency of injection of the pick-up ion component differs from that of the solar wind, and is expected to be strongly enhanced at highly oblique and quasi-perpendicular shock eve…
Wave acceleration of the fast solar wind
Ofman, Leon
Observations show that the solar wind exhibits two modes of outflow: the slow (∼400 km s -1), high density, highly variable wind that emerges from equatorial solar regions, and the high latitude, fast (∼800 km s -1), low density, steady solar wind. The bi-modal solar wind outflow is most evident near minima of solar activity.…
A reconstruction method for the reconnection rate applied to Cluster magnetotail measurements
Penz, T.; Kubyshkin, I. V.; Nakamura, R. +6 more
We apply a theoretical model to describe the behavior of nightside flux transfer events (NFTEs) measured by Cluster satellites in the Earth magnetotail. Based on the Cagniard deHoop method we calculate the magnetic field and plasma flow time series observed by a satellite. Our aim is to solve an inverse problem to obtain the reconnection rate from…
High-resolution X-ray spectra of solar flares
Doschek, G. A.
I discuss high-resolution solar flare soft X-ray spectra and also comment on some recent results from extreme ultraviolet (EUV) spectroscopy. Spectra of solar flares at these wavelengths have been recorded since the late 1960s, beginning primarily with the NASA Orbiting Solar Observatory (OSO) series of spacecraft. Knowledge of EUV flare spectra t…
The soft and hard X-ray emission of 3C 273 from 1996 to 2004 with BeppoSAX and XMM-Newton
Staubert, R.; Deluit, S. J.; Stuhlinger, M.
We present the results of a long monitoring of the quasar 3C 273 with BeppoSAX (1996 2001) and XMM-Newton (2000 2004). Our dataset is composed of nine BeppoSAX and 15 XMM observations for a total exposure time of 855 ks (∼492 ks for BeppoSAX and ∼363 ks for XMM). In the soft X-ray domain, we investigate the 2 10 keV continuum with MECS and PN and …
CME-associated dimmings on the Sun observed with the EUV SPIRIT telescope on the CORONAS-F spacecraft
Slemzin, V.; Kuzin, S.; Chertok, I. +5 more
Based on observations with the EUV SPIRIT telescope aboard the CORONAS-F spacecraft, we analyze large-scale dimmings on the solar disk initiated by halo-type coronal mass ejections (CMEs). We address four powerful geo-effective eruptive events of November 4, 2001; October 28, 29, and November 18, 2003. The SOHO/EIT telescope did not observe the fi…
The Double Star magnetic field investigation: Overview of instrument performance and initial results
Balogh, A.; Zhang, T. L.; Nakamura, R. +15 more
Double Star is a Chinese National Space Administration mission which augments the European Space Agency's Cluster mission by launching an additional two spacecraft; one into an equatorial orbit and one into a polar orbit. These orbits are carefully chosen to complement Cluster by maximising the opportunities for useful conjunctions when Double Sta…
Reconstructed global feature of an interplanetary disturbance for the full-halo coronal mass ejection event on 1999 September 20
Nakagawa, T.; Tokumaru, M.; Kojima, M. +2 more
Traveling interplanetary (IP) disturbances associated with the full-halo coronal mass ejection (CME) which occurred on September 20, 1999, were observed clearly with the 327-MHz interplanetary scintillation (IPS) system of the Solar-Terrestrial Environment Laboratory of Nagoya University. In this study, we retrieved the global features of the IP d…
X-ray observations of black-hole accretion disks
Ebisawa, Ken; Kawaguchi, Toshihiro
Our current theoretical and observational understandings of the accretion disks around Galactic black-holes are reviewed. Historically, a simple phenomenological accretion disk model has been used to interpret X-ray observations. Although such a phenomenological interpretation is still useful, high quality X-ray data from contemporary instruments …