Search Publications
Determining the Solar Source of a Magnetic Cloud Using a Velocity Difference Technique
Mandrini, C. H.; Gulisano, A. M.; Dasso, S. +3 more
For large eruptions on the Sun, it is often a problem that the core dimming region cannot be observed due to the bright emission from the flare itself. However, spectroscopic data can provide the missing information through the measurement of Doppler velocities. In this paper we analyse the well-studied flare and coronal mass ejection that erupted…
Unusual nonlinear waves in the Venusian magnetosheath
Zhang, T. L.; Walker, S. N.; Balikhin, M. A. +4 more
Within the Venusian magnetosheath, Venus Express has observed the existence of high-amplitude, nonlinear waves which have been interpreted as large-scale nonlinear rotational structures within the magnetic field. A number of mechanisms have been proposed that can be used to explain their origin. Venus Express data have been searched for other exam…
Directed follow-up strategy of low-cadence photometric surveys in search of transiting exoplanets - I. Bayesian approach for adaptive scheduling
Zucker, Shay; Dzigan, Yifat
We propose a novel approach to utilize low-cadence photometric surveys for exoplanetary transit search. Even if transits are undetectable in the survey data base alone, it can still be useful for finding preferred times for directed follow-up observations that will maximize the chances to detect transits. We demonstrate this approach through a few…
Analysis of periodic orbits in the Saturn-Titan system using the method of Poincare section surfaces
Safiya Beevi, A.; Sharma, R. K.
We explore the periodic orbits and the regions of quasi-periodic motion around both the primaries in the Saturn-Titan system in the framework of planar circular restricted three-body problem. The location, nature and size of periodic and quasi-periodic orbits are studied using the numerical technique of Poincare surface of sections. The maximum am…
RXTE and XMM observations of intermediate polar candidates
Mukai, K.; Tomsick, J. A.; Norton, A. J. +1 more
Aims: We aim to determine the credentials of nine candidate intermediate polars in order to confirm whether or not they are magnetic cataclysmic variables.
Methods: Frequency analysis of RXTE and XMM data was used to search for temporal variations that could be associated with the spin period of the magnetic white dwarf. X-ray spectral a…
Electric field variability and classifications of Titan's magnetoplasma environment
Arridge, C. S.; Achilleos, N.; Guio, P.
The atmosphere of Saturn's largest moon Titan is driven by photochemistry, charged particle precipitation from Saturn's upstream magnetosphere, and presumably by the diffusion of the magnetospheric field into the outer ionosphere, amongst other processes. Ion pickup, controlled by the upstream convection electric field, plays a role in the loss of…
Molecular accretion in the core of the galaxy cluster 2A 0335+096
McNamara, B. R.; Edge, A. C.; Wilman, R. J. +1 more
We present adaptive optics-assisted K-band integral field spectroscopy of the central cluster galaxy in 2A 0335+096 (z= 0.0349). The H2 v=1-0 S(1) emission is concentrated in two peaks within 600 pc of the nucleus and fainter but kinematically active emission extends towards the nucleus. The H2 is in a rotating structure whic…
Probing the Role of Magnetic-Field Variations in NOAA AR 8038 in Producing a Solar Flare and CME on 12 May 1997
Jain, Rajmal; Bharti, Lokesh; Hanaoka, Y. +3 more
We carried out a multi-wavelength study of a Coronal Mass Ejection (CME) and an associated flare, occurring on 12 May 1997. We present a detailed investigation of magnetic-field variations in NOAA Active Region 8038 which was observed on the Sun during 7 - 16 May 1997. This region was quiet and decaying and produced only a very small flare activit…
Photospheric and coronal abundances in solar-type stars: the peculiar case of τ Bootis
Sanz-Forcada, J.; Maggio, A.; Scelsi, L.
Aims: Chemical abundances in solar-type stars are still a much debated topic in many respects. In particular, planet-hosting stars are known to be metal-rich, but whether or not this peculiarity applies also to the chemical composition of the outer stellar atmospheres is still to be clarified. More in general, coronal and photospheric abundan…
Origin of craters on Phoebe: comparison with Cassini's data
di Sisto, R. P.; Brunini, A.
Context. Phoebe is one of the irregular satellites of Saturn. The images taken by the Cassini-Huygens spacecraft have allowed us to analyze its surface and the craters on it.
Aims: We study the craters on Phoebe produced by both Centaur objects from the scattered disk (SD) and plutinos that have escaped from the 3:2 mean motion resonance with…