Search Publications
The dynamics of the solar radiative zone
Turck-Chièze, Sylvaine; Talon, Suzanne
The picture of the solar radiative zone is evolving quickly. This review is separated in two parts. We first recall how the two powerful probes of the solar interior, namely the neutrinos and helioseismology have scrutinized the microscopic properties of the solar radiative plasma. Recent observations stimulate today complementary activities beyon…
Statistical study of radio drifting pulsation structures with associated CMEs and other observations
Yan, Y. H.; Liu, Y. Y.; Wang, S. J. +5 more
Solar radio burst, especially the fine structures (FSs) and the drifting pulsation structures (DPSs), may be used as an important diagnostics tool to draw the evolution map of the flare loop in the initial phase of solar flares. In this work, 52 radio events were found accompanying with DPSs. They were all observed with the Solar Radio Spectromete…
Modeling Pulsar Wind Nebulae
Bucciantini, N.
In the last few years, new observations by CHANDRA and XMM have shown that Pulsar Wind Nebulae present complex but similar inner features, with the presence of axisymmetric rings and jets, which are generally referred to as a jet-torus structure. Due to the rapid growth in accuracy and robustness of numerical schemes for relativistic fluid-dynamic…
Electromagnetic waves observed by Venus Express at periapsis: Detection and analysis techniques
Russell, C. T.; Wei, H. Y.; Zhang, T. L. +3 more
The magnetometer on Venus Express was designed to be able to obtain 128 Hz samples of the magnetic field from two sensors in a gradiometer configuration. This mode is used around periapsis to determine whether the signals reported at low altitudes near 100 Hz, had the properties of electromagnetic waves generated by electric discharges in the Venu…
Study of waves in the magnetotail region with cluster and DSP
Balogh, A.; Zhang, T. L.; Klecker, B. +6 more
The study of the neutral sheet is of fundamental importance in understanding the dynamics of the Earth’s magnetosphere. From the earliest observation of the magnetotail, it has been found that the neutral sheet frequently appears to be in motion due to changing solar wind conditions and geomagnetic activity. Multiple crossings of the neutral sheet…
New flare model using recent measurements of the solar ultraviolet irradiance
Chamberlin, Phillip C.; Woods, Thomas N.; Eparvier, Francis G.
The solar photon output from the Sun, which was once thought to be constant, varies considerably over time scales from seconds during solar flares to years due to the solar cycle. This is especially true in the wavelengths shorter than 190 nm. These variations cause significant deviations in the Earth and space environment on similar time scales, …
XMM-Newton temperature maps for five intermediate redshift clusters of galaxies
Durret, Florence; Lima Neto, Gastão B.
We have analyzed XMM-Newton archive data for five clusters of galaxies (redshifts 0.223 0.313) covering a wide range of dynamical states, from relaxed objects to clusters undergoing several mergers. We present here temperature maps of the X-ray gas together with a preliminary interpretation of the formation history of these clusters.
Development of thermal sensors and drilling systems for lunar and planetary regoliths
Kaufmann, E.; Kargl, G.; Gao, Yang +2 more
We consider some novel concepts for thermal properties experiments aboard lunar landers or rovers, that may lead to an improved understanding of both the structure of the lunar near surface layers and the lunar thermal history. The new instruments could be developed using the experience and heritage from recently developed systems, like the Rosett…
X-ray study of accretion flow in narrow-line Seyfert 1 galaxies
Terashima, Y.; Haba, Y.; Kunieda, H. +1 more
We present the results of a systematic study of narrow-line Seyfert 1 galaxies (NLS1s) observed with XMM-Newton. The 2 12 keV X-ray spectra of NLS1s are well represented by a single power law with a photon index Γ ∼ 2. When this hard power law continuum is extrapolated into the low energy band, we found that all objects in our sample show prominen…
XMM-Newton observations across the Cygnus Loop from northeastern rim to southwestern rim
Katsuda, Satoru; Tsunemi, Hiroshi
We have observed the Cygnus Loop from the northeast (NE) to the southwest (SW) with XMM-Newton. We extracted spectra from 3‧-spaced annular regions across the Loop and fitted them either with a one-kTe-component non-equilibrium ionization (NEI) model or with two-kTe-component NEI model. We found that the two-kTe-co…