Search Publications
Reduced proton and alpha particle precipitations at Mars during solar wind pressure pulses: Mars Express results
Barabash, S.; Nilsson, H.; Stenberg, G. +2 more
We performed a statistical study of downward moving protons and alpha particles of ~keV energy (assumed to be of solar wind origin) inside the Martian induced magnetosphere from July 2006 to July 2010. Ion and electron data are from the Analyzer of Space Plasma and Energetic Atoms (ASPERA-3) package on board Mars Express. We investigated the solar…
Frequency fluctuations of coherent signals from spacecraft observed during dual-frequency radio sounding of the circumsolar plasma in 2004-2008
Pätzold, M.; Bird, M. K.; Efimov, A. I. +4 more
We have performed spectral processing of the data of experiments on radio sounding of circumsolar plasma by coherent S- and X-band signals from the spacecraft Ulysses, Mars Express, Rosetta, and Venus Express carried out from 1991 to 2009. The experiments were realized in the mode of coherent response, when a signal stabilized by the hydrogen stan…
A comparison of bow shock models with Cluster observations during low Alfvén Mach number magnetic clouds
Kilpua, E. K. J.; Turc, L.; Fontaine, D. +2 more
Magnetic clouds (MCs) are very geoeffective solar wind structures. Their properties in the interplanetary medium have been extensively studied, yet little is known about their characteristics in the Earth's magnetosheath. The Cluster spacecraft offer the opportunity to observe MCs in the magnetosheath, but before MCs reach the magnetosphere, their…
The Clusters AgeS Experiment (CASE): Variable Stars in the Globular Cluster 47 Tucanae
Thompson, I. B.; Kaluzny, J.; Rozyczka, M. +4 more
Based on over 5400 BV images of 47 Tuc collected between 1998 and 2010 we obtained light curves of 65 variables, 19 of which are newly detected objects. New variables are located mostly just outside the core in a region poorly studied by earlier surveys of the cluster. Among them there are four detached eclipsing binaries and five likely optical c…
Age and evolution of the lower NW flank of the Hecates Tholus volcano, Mars, based on crater size-frequency distribution on CTX images
Michael, G. G.; de Pablo, M. A.; Centeno, J. D.
We present results of crater size-frequency distribution (SFD) analysis of the lower NW flank of the Hecates Tholus volcano, Elysium volcanic province of Mars, by the use of images acquired by the Context (CTX) instrument on board of Mars Reconnaissance Orbiter (6 m/pixel in resolution). Previous similar works were focused on the caldera complex o…
The influence of the secondary electrons induced by energetic electrons impacting the Cassini Langmuir probe at Saturn
Gurnett, D. A.; Lewis, G. R.; Coates, A. J. +7 more
The Cassini Langmuir Probe (LP) onboard the Radio and Plasma Wave Science experiment has provided much information about the Saturnian cold plasma environment since the Saturn Orbit Insertion in 2004. A recent analysis revealed that the LP is also sensitive to the energetic electrons (250-450 eV) for negative potentials. These electrons impact the…
Sub-millimetre source identifications and the microjansky source population at 8.4 GHz in the William Herschel Deep Field
Heywood, I.; Rawlings, S.; Metcalfe, N. +4 more
Sub-millimetre observations of the William Herschel Deep Field (WHDF) using the Large Apex Bolometer Camera (LABOCA) revealed possible sub-mm counterparts for two X-ray-absorbed quasars. The primary aim here is to exploit Expanded Very Large Array (EVLA) radio continuum imaging at 8.4 GHz to establish the absorbed quasars as radio/sub-mm sources. …
Hot Plasma Associated with a Coronal Mass Ejection
Raymond, J. C.; Landi, E.; Hara, H. +1 more
We analyze coordinated observations from the EUV Imaging Spectrometer (EIS) and X-Ray Telescope (XRT) on board Hinode of an X-ray Plasma Ejection (XPE) that occurred during the coronal mass ejection (CME) event of 2008 April 9. The XPE was trailing the CME core from behind, following the same trajectory, and could be identified both in EIS and XRT…
A Statistical Study on CMEs Associated with DH-Type-II Radio Bursts Based on Their Source Location (Limb and Disk Events)
Umapathy, S.; Vasanth, V.
We have statistically studied the 344 Coronal Mass Ejections (CMEs) associated with flares and DH-type-II radio bursts (1 - 14 MHz) during 1997 - 2008. We found that only 3 % of the total CMEs (344) compared to the general population CMEs (13208) drives DH-type-II radio bursts (Gopalswamy in Solar Eruptions and Energetic Particles, AGU Geophys. Mo…
Interstellar He+ ring-beam distributions: Observations and implications
Galvin, Antoinette B.; Wimmer-Schweingruber, Robert F.; Berger, Lars +1 more
We report systematic measurements of the distribution of the incident angle of interstellar pickup He+ ions as observed by STEREO/Plasma and Supra-Thermal Ion Composition (PLASTIC). We have organized these observations according to the angle spanned by the Interplanetary Magnetic Field (IMF), B→, and the bulk solar wind velocity, vsw