Search Publications
Solar Activity Cycle in Solar-wind Sources and Flows
Lotova, N. A.; Obridko, V. N.; Vladimirskii, K. V.
Experiments based on multi-source radio occultation measurements of the circumsolar plasma at R∼4.0−70RS were carried out during 1997 - 2008 to locate the inner boundary of the solar-wind transonic transition region, Rin. The data obtained were used to correlate the solar-wind stream structure and magnetic fields on the sourc…
Saturn: Storm-clouds brooding on towering heights
Read, Peter
Springtime on Saturn came in with a bang last December, when a massive storm erupted in its north temperate zone. This rare event has been observed in unprecedented detail from the ground and from space. See Letters p.71 & p.75
No apparent accretion mode changes detected in Centaurus X-3
Müller, D.; Klochkov, D.; Santangelo, A. +2 more
Aims: Two distinct spectral states have previously been reported for Cen X-3 on the basis of RXTE/ASM observations. Intrigued by this result, we investigated the spectral properties of the source using the enhanced possibilities of the X-ray data now available with the aim to clarify and interpret the reported behavior.
Methods: To check…
High Energy Solar Particle Events and Their Associated Coronal Mass Ejections
Manoharan, P. K.; Agalya, G.
Intense solar energetic particle (SEP) events data, associated with ground level enhancements (GLEs), occurred during 1989-2006 have been obtained from the spectrometers on board GOES spacecraft in the energy range 10-100MeV. The interplanetary effects of these events and their associated coronal mass ejections (CMEs) have been provided by the LAS…
Nonlinear electrostatic ion-acoustic "oscilliton" waves driven by charge non-neutrality effects
Liu, W.; Ma, J. Z. G.; Hirose, A. +1 more
Nonlinear "oscilliton" structures features a low-frequency (LF) solitary envelope, the amplitude of which is modulated violently by superimposed high-frequency (HF) oscillations. We have studied the charge non-neutrality effects on the excitation of electrostatic ion-acoustic (IA) oscillitons. A two-fluid, warm plasma model is employed, and a set …
Ground- and space-based study of two globular cluster cataclysmic variables: M22 CV1 and M5 V101
Cool, A. M.; Reynolds, M. T.; Callanan, P. J. +1 more
As a class of compact binaries with large binding energy, cataclysmic variables (CVs) formed through close encounters play an important role in the dynamical evolution of globular clusters. As part of a systematic search for CVs undergoing dwarf nova (DN) eruptions in globular clusters, our 2004 monitoring programme of M22 detected an outburst of …
The rotation rate and its evolution derived from improved mode fitting and inversion methodology
Eff-Darwich, A.; Korzennik, S. G.
We present inferences of the internal solar rotation rate and its evolution during solar cycle 23. A full solar cycle of MDI observations have been analyzed using an improved fitting methodology and using time series of various lengths, up to a single 4,608 day long epoch (64 times 72 days or 12.6 yr). We used time series of spherical harmonic coe…
Field-Aligned Currents at the PSBL on 17 August 2001 Storm: Relationships with solar Wind Conditions
Liu, Zhen-Xing; Shi, Jian-Kui; Cheng, Zheng-Wei +2 more
Using magnetic field and plasma data acquired with Cluster spacecrafts, we investigate the relationship between the field-aligned currents (FACs) at the plasma sheet boundary layer (PSBL) and solar wind dynamic pressure, as well as the interplanetary magnetic field (IMF) By on 17 August 2001 storm. Our studies reveal that FAC density at…
Detection of a Transient X-ray Absorption Line Intrinsic to the BL Lacertae Object H 2356-309
Canizares, Claude R.; Humphrey, Philip J.; Buote, David A. +1 more
Since the launch of the Einstein X-ray Observatory in the 1970s, a number of broad absorption features have been reported in the X-ray spectra of BL Lac objects. These features are often interpreted as arising from high-velocity outflows intrinsic to the BL Lac object, therefore providing important information about the inner environment around th…
A systematic cross-search for radio/infrared counterparts of XMM- Newton sources
Combi, J. A.; Luque-Escamilla, P. L.; Romero, G. E. +7 more
We present a catalog of cross-correlated radio, infrared and X-ray sources using a very restrictive selection criteria with an IDL-based code developed by us. The significance of the observed coincidences was evaluated through Monte Carlo simulations of synthetic sources following a well-tested protocol. We found 3320 coincident radio/X-ray source…