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Characterization and Physical Explanation of Energetic Particles on Planck HFI Instrument
Bock, J. J.; Catalano, A.; Coulais, A. +30 more
The Planck High Frequency Instrument (HFI) has been surveying the sky continuously from the second Lagrangian point (L2) between August 2009 and January 2012. It operates with 52 high impedance bolometers cooled at 100 mK in a range of frequency between 100 GHz and 1 THz with unprecedented sensitivity, but strong coupling with cosmic radiation. At…
In-flight calibration of double-probe electric field measurements on Cluster
André, M.; Eriksson, A. I.; Khotyaintsev, Y. V. +2 more
Double-probe electric field instrument with long wire booms is one of the most popular techniques for in situ measurement of electric fields in plasmas on spinning spacecraft platforms, which have been employed on a large number of space missions. Here we present an overview of the calibration procedure used for the Electric Field and Wave (EFW) i…
Probing mass segregation in the globular cluster NGC 6397
Kepler, S. O.; Costa, J. E. S.; Bonatto, C. +3 more
In this study, we present a detailed study of mass segregation in the globular cluster NGC 6397. First, we carry out a photometric analysis of projected European Southern Observatory (ESO)-Very Large Telescope (VLT) data (between 1 and 10 arcmin from the cluster centre), presenting the luminosity function corrected by completeness. The luminosity …
Turbulence in the Earth's cusp region: The k-filtering analysis
Dunlop, Malcolm; Cao, Jin-Bin; Fu, Huishan +2 more
On 13 April 2002, four Cluster spacecraft with separations up to 127 km measured similar turbulence in the exterior cusp during northward interplanetary magnetic field (IMF) Bz. Both the power spectra of magnetic and electric field fluctuations resemble the classical Kolmogorov power law, with the scaling f-1.7 under the prot…
Effects of cosmic strings with delayed scaling on CMB anisotropy
Yokoyama, Jun'ichi; Kamada, Kohei; Miyamoto, Yuhei +1 more
The network of cosmic strings generated in a phase transition during inflation enters the scaling regime later than that of usual strings. If it occurs after the recombination, temperature anisotropies of the cosmic microwave background (CMB) at high multipole moments are significantly reduced. In this paper, we study such effects qualitatively an…
Solar Wind Electron Strahls Associated with a High-Latitude CME: Ulysses Observations
Lazar, M.; Poedts, S.; Pomoell, J. +2 more
Counterstreaming beams of electrons are ubiquitous in coronal mass ejections (CMEs) - although their existence is not unanimously accepted as a necessary and/or sufficient signature of these events. We continue the investigation of a high-latitude CME registered by the Ulysses spacecraft on 18 - 19 January 2002 (Dumitrache, Popescu, and Oncica, So…
Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E6
Anchordoqui, Luis A.; Goldberg, Haim; Vlcek, Brian J. +1 more
The tensor-to-scalar ratio (r = 0.20+0.07-0.05) inferred from the excess B-mode power observed by the Background Imaging of Cosmic Extragalactic Polarization (BICEP2) experiment is almost twice as large as the 95% CL upper limits derived from temperature measurements of the WMAP (r < 0.13) and Planck (r < 0.11) space mi…
Validation of the k-filtering technique for a signal composed of random-phase plane waves and non-random coherent structures
Li, X.; Roberts, O. W.; Jeska, L.
Recent observations of astrophysical magnetic fields have shown the presence of fluctuations being wave-like (propagating in the plasma frame) and those described as being structure-like (advected by the plasma bulk velocity). Typically with single-spacecraft missions it is impossible to differentiate between these two fluctuations, due to the inh…
Spatiotemporal Organization of Energy Release Events in the Quiet Solar Corona
Davila, Joseph M.; Uritsky, Vadim M.
Using data from the STEREO and SOHO spacecraft, we show that temporal organization of energy release events in the quiet solar corona is close to random, in contrast to the clustered behavior of flaring times in solar active regions. The locations of the quiet-Sun events follow the meso- and supergranulation pattern of the underling photosphere. T…
How dusty is α Centauri?. Excess or non-excess over the infrared photospheres of main-sequence stars
Olofsson, G.; Krivov, A. V.; Eiroa, C. +19 more
Context. Debris discs around main-sequence stars indicate the presence of larger rocky bodies. The components of the nearby, solar-type binary α Centauri have metallicities that are higher than solar, which is thought to promote giant planet formation.
Aims: We aim to determine the level of emission from debris around the stars in the α Cen s…