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A large active wave trapped in Jupiter's equator
Sánchez-Lavega, A.; García-Melendo, E.; Gómez-Forrellad, J. M. +2 more
Context. A peculiar atmospheric feature was observed in the equatorial zone (EZ) of Jupiter between September and December 2012 in ground-based and Hubble Space Telescope (HST) images. This feature consisted of two low albedo Y-shaped cloud structures (Y1 and Y2) oriented along the equator and centred on it (latitude 0.5°-1°N).
Aims: We wante…
Near-infrared Circular and Linear Polarimetry of Monoceros R2
Kwon, Jungmi; Nagata, Tetsuya; Tamura, Motohide +2 more
We have conducted simultaneous JHK s -band imaging circular and linear polarimetry of the Monoceros R2 (Mon R2) cluster. We present results from deep and wide near-infrared linear polarimetry of the Mon R2 region. Prominent and extended polarized nebulosities over the Mon R2 field are revisited, and an infrared reflection nebula associ…
Additional spectroscopic redshift measurements for galaxy clusters from the first Planck catalogue
Aghanim, N.; Melnikov, S. S.; Irtuganov, E. N. +10 more
We present the results of spectroscopic redshift measurements for the galaxy clusters from the first all-sky Planck catalogue that have been mostly identified based on the optical observations performed previously by our team (Planck Collaboration 2015a). Data on 13 galaxy clusters at redshifts from z ≈ 0.2 to z ≈ 0.8, including the improved ident…
Minute pulsations in microwaves and X-rays during the flare on May 6, 2005
Kupriyanova, E. G.; Ratcliffe, H.
Quasi-periodic pulsations are a common feature in the emission associated with solar flares. In particular, pulsations with periods of tens of seconds to a few minutes are often seen in microwave and hard X-ray emission. We examine the spatial and temporal structure of the emission during the flare on May 6, 2005. The source of the flare is a magn…
The HST view of the innermost narrow line region
Marconi, Alessandro; Capetti, Alessandro; Baldi, Ranieri D. +2 more
We analyze the properties of the innermost narrow line region in a sample of low-luminosity AGN. We select 33 LINERs (bona fide AGN) and Seyfert galaxies from the optical spectroscopic Palomar survey observed by HST/STIS. We find that in LINERs the [ N II ] and [ O I ] lines are broader than the [ S II ] line and that the [ N II ] /[ S II ] flux r…
A sequence of flux transfer events potentially generated by different generation mechanisms
Fazakerley, A. N.; Fear, R. C.; Trattner, K. J. +2 more
Flux transfer events (FTEs) are magnetic structures generated by time-varying reconnection at the dayside magnetopause. Understanding their generation mechanism is important, because it is necessary in order to understand the global contribution of FTEs to the convection process. We present observations of several FTEs sequentially observed by Clu…
Kinetic models of sub-ion cylindrical magnetic hole
Artemyev, A. V.; Vasko, I. Y.; Yushkov, E. V. +1 more
Magnetic holes are magnetoplasma structures very similar to the classical θ-pinch. They are widely observed in the space plasma and identified by the substantial magnetic field depressions on scales from magnetohydrodynamic range to electron scales. In this paper, we develop the kinetic models of cylindrically symmetric magnetic holes with sub-ion…
Rosetta science operations in support of the Philae mission
Altobelli, Nicolas; Almeida, Miguel; Martin, Patrick +16 more
The international Rosetta mission was launched on 2nd March 2004 and after its ten year journey, arrived at its target destination of comet 67P/Churyumov-Gerasimenko, during 2014. Following the January 2014 exit from a two and half year hibernation period, Rosetta approached and arrived at the comet in August 2014. In November 2014, the Philae lan…
Electrical conductivity of the dusty plasma in the Enceladus plume
Yaroshenko, V. V.; Lühr, H.
The plasma conductivity is an important issue for understanding the magnetic field structure registered by Cassini in the Enceladus proximity. We have revise the conductivity mechanism to incorporate the plume nanograins as a new plasma species and take into account the relevant collisional processes including those accounting for the momentum exc…
Far-infrared and sub-millimetre imaging of HD 76582's circumstellar disc
Matthews, Brenda C.; Booth, Mark; Zuckerman, Ben +3 more
Debris discs, the tenuous rocky and icy remnants of planet formation, are believed to be evidence for planetary systems around other stars. The JCMT/SCUBA-2 debris disc legacy survey `SCUBA-2 Observations of Nearby Stars' (SONS) observed 100 nearby stars, amongst them HD 76582, for evidence of such material. Here, we present imaging observations b…