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Evidence of transverse magnetospheric field line oscillations as observed from Cluster and ground magnetometers
Balogh, A.; Wild, J. A.; Yeoman, T. K. +3 more
The dynamic spectrum of ULF waves from magnetic field data obtained by the elliptically orbiting Cluster satellites (with an apogee of 119000km, perigee of 19000km and the orbital period of 57h) have been prepared in the frequency range 0 to 120mHz when the satellite was near its perigee. The existence of field line oscillations, with increasing f…
Relating near-Earth observations of an interplanetary coronal mass ejection to the conditions at its site of origin in the solar corona
Balogh, A.; van Driel-Gesztelyi, L.; Lucek, E. +7 more
A halo coronal mass ejection (CME) was detected on January 20, 2004. We use solar remote sensing data (SOHO, Culgoora) and near-Earth in situ data (Cluster) to identify the CME source event and show that it was a long duration flare in which a magnetic flux rope was ejected, carrying overlying coronal arcade material along with it. We demonstrate …
Neutral sheet normal direction determination
Balogh, A.; Zhang, T. L.; Glassmeier, K. -H. +5 more
One of the important parameters in magnetotail studies is the thickness of the current sheet. The determination of this thickness is subject to many assumptions of the geometry, such as the current sheet normal direction. The minimum variance analysis (MVA) has been widely used in studies of the current sheet in the tail or at the magnetopause wit…
ISO observations of 3-200 µm emission by three dust populations in an isolated local translucent cloud
Juvela, M.; Lemke, D.; Lehtinen, K. +2 more
We present ISOPHOT spectrophotometry of three positions within the isolated high-latitude cirrus cloud G 300.2-16.8, spanning from the near- to far-infrared (NIR to FIR). The positions exhibit contrasting emission spectrum contributions from the unidentified infrared bands (UIBs), very small grains (VSGs) and large classical grains, and both semi-…
Io's Atmosphere and Surface-Atmosphere Interactions
Lellouch, Emmanuel
Our knowledge of Io’s atmosphere has improved dramatically in the last fifteen years, with a wealth of new observational data at millimeter, UV and IR wavelengths, and the development of numerous models describing its horizontal and vertical structure, composition, photochemistry and plasma interaction. Io’s atmosphere is dominantly composed of SO…
The Cassini solar Faraday rotation experiment
Russell, C. T.; Jensen, E. A.; Bird, M. K. +3 more
The Cassini Faraday rotation experiment improves the current understanding of the coronal magnetic field by making the first measurements of the magnetic field within two solar radii of the south pole and by allowing the separation of the changing electron density from the magnetic field during transient crossings of the line of sight. Simultaneou…
A Multiwavelength Study of the X-Ray Sources in NGC 5018
Wu, Kinwah; Tennant, Allyn F.; Swartz, Douglas A. +2 more
The E3 giant elliptical galaxy NGC 5018 was observed with the Chandra X-Ray Observatory's Advanced CCD Imaging Spectrometer for 30 ks on 2001 April 14. Results of the analysis of these X-ray data as well as of complementary optical, infrared, and radio data are reported. Seven X-ray point sources, including the nucleus, were detected. If they are …
Helioseismic Ring Analyses of Artificial Data Computed for Two-dimensional Shearing Flows
Gough, Douglas; Thompson, Michael J.; Toomre, Juri +1 more
The local helioseismological technique of ring analysis has been crucial in the discovery of complex large-scale flows in the Sun's near-surface shear layer. However, current implementations of ring-analysis procedures assume that the flow field is horizontally homogeneous over the analysis region. This assumption is certainly incorrect, and in th…
Abundances of planetary nebulae NGC 2022 , NGC 6818 and IC 4191
Pottasch, S. R.; Beintema, D. A.; Feibelman, W. A.
The ISO and IUE spectra of the elliptical nebulae
Automated Technique For Comparison Of Magnetic Field Inversion Lines With Filament Skeletons From The Solar Feature Catalogue
Zharkova, V. V.; Aboudarham, J.; Zharkov, S. +3 more
We present an automated technique for comparison of magnetic field inversion-line maps from SOHO/MDI magnetograms with solar filament data from the Solar Feature Catalogue created as part of the European Grid of Solar Observations project. The Euclidean distance transform and connected component labelling are used to identify nearest inversion lin…