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Mt. Wendelstein imaging of the post-perihelion dust coma of 67P/Churyumov-Gerasimenko in 2015/2016
Hopp, Ulrich; Riffeser, Arno; Kluge, Matthias +3 more
Comet 67P/Churyumov-Gerasimenko (67P) was imaged with the 2 m telescope at Mt. Wendelstein Observatory in the Alps. Coma and tail monitoring was performed during 51 nights between 2015 August 22 and 2016 May 9. The images through r and I Sloan Digital Sky Survey (SDSS) filters show the dust distribution around the comet, while images in the SDSS g…
Mirror modes in the Earth's magnetosheath: Results from a global hybrid-Vlasov simulation
Vainio, Rami; Pfau-Kempf, Yann; Ganse, Urs +5 more
We investigate mirror mode structures in the Earth's magnetosheath using our global kinetic Vlasiator simulation, which models ion behavior through their distribution function and treats electrons as a charge-neutralizing fluid. We follow the evolution of waves as they advect along velocity streamlines through the magnetosheath. We find that mirro…
Planck intermediate results. XXXIV. The magnetic field structure in the Rosette Nebula
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +197 more
Planck has mapped the polarized dust emission over the whole sky, making it possible to trace the Galactic magnetic field structure that pervades the interstellar medium (ISM). We combine polarization data from Planck with rotation measure (RM) observations towards a massive star-forming region, the Rosette Nebula in the Monoceros molecular cloud,…
High-Time Resolution In-situ Investigation of Major Cometary Volatiles around 67P/C-G at 3.1 - 2.3 AU Measured with ROSINA-RTOF
Wurz, P.; Bochsler, P.; Altwegg, K. +32 more
Comets considered to be pristine objects contain key information about the early formation of the solar system. Their volatile components can provide clues about the origin and evolution of gases and ices in the comets. Measurements with ROSINA/RTOF at 67P/Churyumov-Gerasimenko have now allowed, for the first time, a direct in situ high-time resol…
Suzaku spectra of a Type-II supernova remnant, Kes 79
Takahashi, Tadayuki; Koyama, Katsuji; Lee, Shiu-Hang +1 more
This paper reports on results of a Suzaku observation of the supernova remnant (SNR) Kes 79 (G33.6+0.1). The X-ray spectrum is best fitted by a two-temperature model: a non-equilibrium ionization (NEI) plasma and a collisional ionization equilibrium (CIE) plasma. The NEI plasma is spatially confined within the inner radio shell with kT ∼ 0.8 keV, …
Reconstructing the magnetosphere from data using radial basis functions
Tsyganenko, Nikolai A.; Andreeva, Varvara A.
A new method is proposed to derive from data magnetospheric magnetic field configurations without any a priori assumptions on the geometry of electric currents. The approach utilizes large sets of archived satellite data and uses an advanced technique to represent the field as a sum of toroidal and poloidal parts, whose generating potentials Ψ
Reflection of Propagating Slow Magneto-acoustic Waves in Hot Coronal Loops: Multi-instrument Observations and Numerical Modeling
Van Doorsselaere, Tom; Pant, Vaibhav; Banerjee, Dipankar +3 more
Slow MHD waves are important tools for understanding coronal structures and dynamics. In this paper, we report a number of observations from the X-Ray Telescope (XRT) on board HINODE and Solar Dynamic Observatory/Atmospheric Imaging Assembly (AIA) of reflecting longitudinal waves in hot coronal loops. To our knowledge, this is the first report of …
Can giant radio halos probe the merging rate of galaxy clusters?
Brunetti, G.; Cassano, R.; Ettori, S. +1 more
Observations of galaxy clusters both in the radio and X-ray bands probe a direct link between cluster mergers and giant radio halos, suggesting that these sources can be used as probes of the cluster merging rate with cosmic time. While all giant radio halos are found in merging clusters, not every merging cluster hosts a giant radio halo. In this…
Model-Observation Comparisons of Electron Number Densities in the Coma of 67P/Churyumov-Gerasimenko during January 2015
Altwegg, K.; Henri, P.; Edberg, N. J. T. +7 more
During 2015 January 9-11, at a heliocentric distance of ∼2.58-2.57 au, the ESA Rosetta spacecraft resided at a cometocentric distance of ∼28 km from the nucleus of comet 67P/Churyumov-Gerasimenko, sweeping the terminator at northern latitudes of 43°N-58°N. Measurements by the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis/Comet Pressure…
Study of the reflection spectrum of the LMXB 4U 1702-429
Sanna, A.; Papitto, A.; Di Salvo, T. +7 more
Context. The source