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Multi-instrument observations of a large scale Pc4 pulsation
Lucek, E. A.; Yeoman, T. K.; Clausen, L. B. N. +1 more
On 7 November 2005 various ground based and spaced based instruments registered five wave packets with frequencies in the Pc4 range. The most prominent of the five wave packets was observed in ground based magnetometer data spanning almost all latitudes on the dayside magnetosphere. The propagation from the dayside into the tail is deduced from Po…
Observations of anomalous transport of energetic electrons in the heliosphere
Perri, S.; Zimbardo, G.
We study the propagation of energetic particles, accelerated by interplanetary shock waves, upstream of the shock, considering the possibility of having anomalous transport. The theoretical treatment of the anomalous transport is developed via the propagator formalism, considering that in the case of a superdiffusive transport the propagator has p…
Large-Scale Coronal Density and Abundance Structures and Their Association with Magnetic Field Structure
Raymond, John C.; Riley, Pete; Li, Jing +1 more
We construct subsynoptic maps of the ultraviolet-line fluxes, electron density, and elemental abundances for an east limb corona at 1.63 solar radii from 2000 September 20 to October 1. The data, covering position angles of 85°-126°, were taken from the Ultraviolet Coronagraph Spectrometer (UVCS) on board the Solar and Heliospheric Observatory (SO…
Spatial and Temporal Noise in Solar EUV Observations
Delouille, V.; Hochedez, J. -F.; Chainais, P.
Solar telescopes will never be able to resolve the smallest events at their intrinsic physical scales. Pixel signals recorded by SOHO/(CDS, EIT, SUMER), STEREO/SECCHI/ EUVI, TRACE, SDO/AIA, and even by the future Solar Orbiter EUI/HRI contain an inherent "spatial noise" since they represent an average of the solar signal present at subpixel scales…
Spectroscopic distances of 28 nearby star candidates
Stecklum, B.; Jahreiß, H.; Meusinger, H. +1 more
Aims: Twenty eight hitherto neglected candidates for the Catalogue of Nearby Stars (CNS) were investigated to verify their classification and to improve their distance estimates. All targets had at least a preliminary status of being nearby dwarf stars based on their large proper motions and relatively faint magnitudes. Better photometric and/or s…
Gravi-Magnetic Rotators in Cataclysmic Binary Stars
Andronov, I. L.
Various astrophysical processes are reviewed, which take place in the classical, asynchronous and intermediate polars, as well as the results of their theoretical and observational investigations according to the international program ``Inter-Longitude Astronomy''. The uniqueness of the class of polars is the largest arbitrary influence of the mag…
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, …
Q2237+0305 in X-rays: spectra and variability with XMM-Newton
Vignali, C.; Palumbo, G. G. C.; Fedorova, E. V. +1 more
Aims: X-ray observations of gravitationally lensed quasars may allow us to probe the inner structure of the central engine of a quasar. Observations of Q2237+0305 (Einstein Cross) in X-rays may be used to constrain the inner structure of the X-ray emitting source.
Methods: Here we analyze the XMM-Newton observation of the quasar in the gravita…
A Search for the Optical Counterpart to the Magnetar CXOU J010043.1-721134
van Kerkwijk, M. H.; Durant, M.
After our tentative detection of an optical counterpart to CXOU J010043.1-721134 from archival Hubble Space Telescope (HST) imaging, we have followed up with further images in four bands. Unfortunately, the source originally identified is not confirmed. We provide deep photometric limits in four bands and accurate photometry of field stars around …
The structure of the AD diagram for the hyades cluster
Vereshchagin, S. V.; Reva, V. G.; Chupina, N. V.
The Hyades Cluster is used to analyze details of the AD-diagram method developed in our earlier works and applied to the corona of the Ursa Major stream. Hipparcos data are used to analyze the kinematics of the Hyades Cluster and determine its apex. Evidence for rotation of the cluster is presented.