Search Publications
The Red Nova-like Variable in M31—A Blue Candidate in Quiescence
Shara, Michael M.; Prialnik, Dina; Zurek, David +2 more
M31-RV was an extraordinarily luminous (~106 L sun) eruptive variable, displaying very cool temperatures (roughly 1000 K) as it faded. While this object's peak luminosity matched or exceeded those of the brightest known classical novae, its red colors and cool spectra were very different from those of classical novae. The pho…
The Three-Dimensional Structure of the Inner Heliosphere
Riley, Pete
In this review we summarize our current knowledge regarding the three-dimensional structure of the quasi-steady, large-scale inner heliosphere. This understanding is based on the interpretation of a wide array of remote and in situ measurements, in conjunction with sophisticated numerical models. Observations by the Ulysses spacecraft, in particul…
Generation and Validation of Ion Energy Spectra Based on Cluster RAPID and CIS Measurements
Dandouras, Iannis; Kronberg, Elena A.; Daly, Patrick W. +2 more
We present a method to combine spectral information from the Cluster RAPID (Research with Adaptive Particle Imaging) and CIS (Cluster Ion Spectroscopy) instruments. Preliminary results from the magnetotail show that the kappa distribution can fit the ion distributions in the magnetotail, for example in thin plasma sheets during quiet and disturbed…
Interaction of the solar wind and stream particles, results from the Cassini dust detector
Postberg, Frank; Grün, Eberhard; Kempf, Sascha +5 more
The stream particles are nanometer-size dust particles ejected from the jovian and the saturnian systems with velocities greater than 100 kms-1. Due to their small size, stream particles are more sensitive to the electromagnetic force than to gravity. It has been shown by the simulations that the stream-particle dynamics in interplaneta…
Radial Heliospheric Magnetic Fields in Solar Wind Rarefaction Regions: Ulysses Observations
Lario, D.; Roelof, E. C.
We examine the distribution of directions of the heliospheric magnetic field (HMF) measured by the Ulysses spacecraft during its mid-latitude transits of the heliosphere when it observed solar wind shears from the incursions of high-latitude fast solar wind toward the low-latitude slow solar wind. We look for nearly radial field orientations commo…
Green's Functions for Far-Side Seismic Images: A Polar-Expansion Approach
Pérez Hernández, F.; González Hernández, I.
We have computed seismic images of magnetic activity on the far surface of the Sun by using a seismic-holography technique. As in previous works, the method is based on the comparison of waves going in and out of a particular point in the Sun, but we have computed here Green's functions from a spherical polar expansion of the adiabatic wave equati…
New Multifractal Analyses of the Solar Wind Turbulence : Rank-Ordered Multifractal Analysis and Generalized Two-scale Weighted Cantor Set Model
Lamy, H.; Wawrzaszek, A.; Macek, W. M. +1 more
Since the work of Burlaga in 1991, various multifractal analyses have been performed to better characterize the intermittency of the fluctuations in the turbulent solar wind. These analyses were based either on the classical structure functions or on the partition function. Recently, two new multifractal analyses have been proposed to better chara…
Space - Time Distribution of G-band and Ca II H-line Intensity Oscillations in Hinode/SOT - FG Observations
Lawrence, J. K.; Cadavid, A. C.
We study the space - time distributions of intensity fluctuations in 2 - 3 hour sequences of multi-spectral, high-resolution, high-cadence, broad-band filtergram images of the Sun made by the SOT - FG system aboard the Hinode spacecraft. In the frequency range 5.5<f<8.0 mHz both G-band and Ca II H-line oscillations are suppressed in the pres…
Note on Travel Time Shifts Due to Amplitude Modulation in Time-Distance Helioseismology Measurements
Kosovichev, A. G.; Nigam, R.
Correct interpretation of acoustic travel times measured by time-distance helioseismology is essential to get an accurate understanding of the solar properties that are inferred from them. It has long been observed that sunspots suppress p-mode amplitude, but its implications on travel times have not been fully investigated so far. It has been fou…
XMM-Newton observations of H2O maser galaxy NGC 7479
Wang, Jin; Zhang, Jiang-Shui; Fan, Jun-Hui
The XMM-Newton observations of H2O megamaser galaxy NGC 7479 are presented. Its smoothed X-ray image clearly shows spiral morphology, which matches well with its optical asymmetric spiral structure. One prominent source can be found at the tip of its northern spiral arm, which is much brighter than its nuclear X-ray source (about a 50% …