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GMRT observations of the field of INTEGRAL X-ray sources. II
Durouchoux, P.; Ishwara-Chandra, C. H.; Manchanda, R. +2 more
We conducted low-frequency radio observations with the Giant Metrewave Radio Telescope (GMRT) of the 40 new hard X-ray sources discovered by the INTEGRAL satellite. This survey was conducted in order to study radio emissions from these sources, to provide precise position, and to identify new microquasar candidates. Our observations show that 24 o…
Detailed analysis of low-energy electron streaming in the near-Earth neutral line region during a substorm
Balogh, A.; Fazakerley, A. N.; Klecker, B. +11 more
A synaptic view of Cluster FGM, CIS, EDI, and PEACE observations of the near-Earth neutral line region during 1800 1830 UT on 13 September 2002 is discussed. Associated with the flow reversal and a thin cross-tail current sheet, a clear signature of a quadrupolar magnetic field is observed, which indicates the formation of the Hall current system …
Changing electrical nature of Saturn's rings: Implications for spoke formation
Gurnett, D. A.; Kurth, W. S.; Kaiser, M. L. +2 more
During Cassini's orbit insertion at Saturn, the trajectory took the spacecraft overtop the planet's famed ring system. At this time, the Cassini Radio and Plasma Wave Science (RPWS) instrument obtained unprecedented observations of electron density in the vicinity of the rings. Using this information and a model of photoemission anticipated from t…
Exploration of Venus with the Venera-15 IR Fourier spectrometer and the Venus Express planetary Fourier spectrometer
Ignatiev, N. I.; Zasova, L. V.; Formisano, V. +2 more
The infrared spectrometry of Venus in the range 6-45 µm allows one to sound the middle atmosphere of Venus in the altitude range 55-100 km and its cloud layer. This experiment was carried out onboard the Soviet automatic interplanetary Venera-15 station, where the Fourier spectrometer for this spectral range was installed. The measurements h…
Multi-Satellite Observations of ULF Waves
Volwerk, Martin
Single spacecraft observations of ULF waves can only give limited information on the properties of these waves. One can determine e.g., polarization and use minimum variance analysis to obtain an indication of the propagation direction. To obtain more and more accurate information, it is necessary to use multi-spacecraft data. With the arrival of …
Compact X-ray binaries in and out of core collapsed globulars
Grindlay, Jonathan E.
We review new Chandra and HST observations of the core collapsed cluster NGC 6397 as a guide to understanding the compact binary (CB) populations in core collapse globulars. New cataclysmic variables (CVs) and main sequence chromospherically active binaries (ABs) have been identified, enabling a larger sample for comparison of the Lx, F…
Philae (Rosetta Lander): Experiment status after commissioning
Rosenbauer, H.; Biele, J.; Bibring, J. P. +2 more
Being successfully launched on March 2, 2004, ESA's cornerstone mission "ROSETTA" (originally planned to be launched in January 2003 to comet Wirtanen) is en route. It will also bring the 100 kg Lander "Philae" with a scientific payload of 26.7 kg to the surface of comet 67P/Churyumov-Gerasimenko. After a first scientific sequence in 2014 it will …
A Soft X-Ray Transient in the M31 Bulge
Williams, Benjamin F.; McClintock, Jeffrey E.; Murray, Stephen S. +2 more
We have examined a probable soft X-ray transient source in the M31 bulge at R.A.=0h42m41.814s+/-0.08", decl.=41deg16'35.86"+/-0.07". On the three occasions we observed the source, its spectrum was soft (kTin~1 keV). The brightest detection of the source was on 2004 July 17, with a 0.3-7 keV lu…
Exploring the Potential of Integral Field Spectroscopy for Observing Extrasolar Planet Transits: Ground-based Observations of the Atmospheric Na in HD 209458b
Arribas, Santiago; Sparks, William B.; Gilliland, Ronald L. +3 more
We explore the use of integral field spectroscopy (IFS) for observing extrasolar planet transits. Although this technique should find its full potential in space-based observations (e.g., James Webb Space Telescope, Terrestrial Planet Finder), we have tested its basics with ground-based time-series observations of HD 209458b obtained with the Will…
Review of Ionospheric Effects of Solar Wind Magnetosphere Coupling in the Context of the Expanding Contracting Polar Cap Boundary Model
Wild, J. A.; Lester, M.; Milan, S. E. +1 more
This paper reviews the coupling between the solar wind, magnetosphere and ionosphere. The coupling between the solar wind and Earth’s magnetosphere is controlled by the orientation of the Interplanetary Magnetic Field (IMF). When the IMF has a southward component, the coupling is strongest and the ionospheric convection pattern that is generated i…