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A new mechanism for the crab fingers
Carlqvist, P.
Images of the outer filamentary parts of the Crab Nebula, earlier obtained with the Hubble Space Telescope WFPC2, are reconsidered. On inspection of the images it is found that most of the mainly radially oriented fingers possess an internal structure, usually in the form of two or more filaments. For some of the fingers there are clear signs that…
Stereoscopic Spectroscopy for Efficient Spectral Imaging and Magnetography
DeForest, Craig; Elmore, D. F.; Bradford, M. P. +2 more
Stereoscopic imaging spectroscopy is a novel technique that uses multiple spectral orders and stereoscopic reconstruction to eliminate the need for a slit in a dispersive spectrograph, potentially increasing photon efficiency by 1-2 orders of magnitude compared with conventional spectral imaging. We present advances in stereoscopic reconstruction,…
Local wavelet correlation: applicationto timing analysis of multi-satellite CLUSTER data
Dudok de Wit, T.; Dunlop, M.; Soucek, J. +1 more
Multi-spacecraft space observations, such as those of CLUSTER, can be used to infer information about local plasma structures by exploiting the timing differences between subsequent encounters of these structures by individual satellites. We introduce a novel wavelet-based technique, the Local Wavelet Correlation (LWC), which allows one to match t…
Thinning and expansion of the substorm plasma sheet: Cluster PEACE timing analysis
Balogh, A.; Fazakerley, A.; Owen, C. +1 more
The storage and subsequent removal of magnetic flux in the magnetotail during a geomagnetic substorm has a dramatic effect on the thickness of the cross-tail plasma sheet. The near-Earth plasma sheet is thought to thin during the growth phase and then rapidly expand after onset of the substorm. The direction of propagation, whether earthward or ta…
Multi-correlation analyses of TOF-SIMS spectra for mineralogical studies
Thomas, R.; Engrand, C.; Martin, P. +2 more
A time-of-flight mass spectrometer (TOF-SIMS, COSIMA experiment) has been launched by ESA the 2nd March 2004, on board the comet bound spacecraft "ROSETTA". The scientific objectives of COSIMA are the determination of the compositions of cometary grains as well as the molecular analyses of their exposed organic compounds. These analyses will provi…
Absolute Accuracy and Repeatability of the Rmib Radiometers for Tsi Measurements
Mekaoui, Sabri; Dewitte, Steven; Conscience, Christian +3 more
Radiometers for the measurement of the total solar irradiance from space have been developed by D. Crommelynck at the Royal Meteorological Institute of Belgium (RMIB) since 1970. These radiometers, also used in the set of instruments defining the "World Radiometric Reference", have successively flown on SPACELAB 1, ATLAS 1, EURECA, ATLAS 2, ATLAS …
1WGA J2223.7-0206: A Narrow-Line Quasi-Stellar Object in the XMM-Newton field of view of 3C 445
Palazzi, E.; Masetti, N.; Grandi, P. +1 more
We report the discovery of a Narrow Line QSO located at about 1.3' from the Broad Line Radio Galaxy 3C 445. The source, 1WGA J2223.7-0206, although already revealed by ROSAT, has never been optically identified previously. An XMM-Newton observation of 3C 445 has allowed, for the first time, an accurate X-ray spectral study of 1WGA J2223.7-0206, re…
Instantaneous local wave vector estimation from multi-spacecraft measurements using few spatial points
Buckley, A.; Carozzi, T.; Gough, M.
Available from http://www.copernicus.org/site/EGU/annales/22/7/2633.htm?FrameEngine=false;
Absolute Calibration of the PL-Relations for the Classical Cepheids Based on the HIPPARCOS Parallaxes and the Distances of the Magellanic Clouds
Abrahamyan, H. V.
The zero points of the period-luminosity relations for the classical cepheids are calibrated based on the HIPPARCOS parallaxes of these stars. The calibrations are used to determine the distance moduli of the LMC and SMC: DMLMC = 18m.569 ± 0m.117 and DMSMC = 19m.070 ± 0m.119, respec…
Photometric analysis of EL Aqr
Wadhwa, Surjit S.; Zealey, William J.
We present an analysis of the Hipparcos and ASAS photometry of the W UMa star EL Aqr. The Wilson-Devinney code is employed in conjunction with recent spectroscopic mass ratio of 0.203 to model the V band light curve. We confirm that the system is an A type contact binary however our analysis suggests that it is over massive for its spectral class …