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Comparative study of three reconnection X line models at the Earth's dayside magnetopause using in situ observations
Walsh, B. M.; Sibeck, D. G.; Gonzalez, W. D. +3 more
This work examines the large-scale aspects of magnetic field reconnection at the Earth's dayside magnetopause. We use two sets of reconnection events, which are identified mostly by the in situ detection of accelerated and Alfvénic plasma flows. We intercompare three analytical models that predict the reconnection X line location and orientation, …
Observations of Reconnection Flows in a Flare on the Solar Disk
Fletcher, L.; Hannah, I. G.; Jeffrey, N. L. S. +3 more
Magnetic reconnection is a well-accepted part of the theory of solar eruptive events, though the evidence is still circumstantial. Intrinsic to the reconnection picture of a solar eruptive event, particularly in the standard model for two-ribbon flares (CSHKP model), are an advective flow of magnetized plasma into the reconnection region, expansio…
Multi-instrument observation of simultaneous polar cap auroras on open and closed magnetic field lines
Lester, M.; Fear, R. C.; Zhang, Y. +5 more
This paper presents observations of polar cap auroral features on 19 January 2008, evaluated using multiple instruments with near-simultaneous observations in both hemispheres. Analysis of the features indicates that there are at least two formation mechanisms/types of polar cap aurora occurring simultaneously on different magnetic field topologie…
Radio observations of globulettes in the Carina nebula
Persson, C. M.; Gahm, G. F.; Grenman, T. +2 more
Context. The Carina nebula hosts a large number of globulettes. An optical study of these tiny molecular clouds shows that the majority are of planetary mass, but there are also those with masses of several tens up to a few hundred Jupiter masses.
Aims: We seek to search for, and hopefully detect, molecular line emission from some of the more…
H2 Fluorescence in M Dwarf Systems: A Stellar Origin
Loyd, R. O. Parke; Roberge, Aki; Kruczek, Nicholas +7 more
Observations of molecular hydrogen (H2) fluorescence are a potentially useful tool for measuring the H2 abundance in exoplanet atmospheres. This emission was previously observed in {{M}} dwarfs with planetary systems. However, low signal-to-noise prevented a conclusive determination of its origin. Possible sources include exo…
Contribution of the first galaxies to the cosmic far-infrared/sub-millimeter background - I. Mean background level
De Rossi, María Emilia; Bromm, Volker
We study the contribution of the first galaxies to the far-infrared/sub-millimeter (FIR/sub-mm) extragalactic background light (EBL) by implementing an analytical model for dust emission. We explore different dust models, assuming different grain-size distributions and chemical compositions. According to our findings, observed reradiated emission …
Current sheets in comet 67P/Churyumov-Gerasimenko's coma
Coates, A. J.; Jones, G. H.; Glassmeier, K. -H. +16 more
The Rosetta Plasma Consortium (RPC) data are used to investigate the presence of current sheets in the coma of comet 67P/Churyumov-Gerasimenko. The interaction of the interplanetary magnetic field (IMF) transported by the solar wind toward the outgassing comet consists amongst others of mass loading and field line draping near the nucleus. The dra…
The Faintest WISE Debris Disks: Enhanced Methods for Detection and Verification
Metchev, Stanimir A.; Heinze, Aren; Patel, Rahul I. +1 more
In an earlier study, we reported nearly 100 previously unknown dusty debris disks around Hipparcos main-sequence stars within 75 pc by selecting stars with excesses in individual WISE colors. Here, we further scrutinize the Hipparcos 75 pc sample to (1) gain sensitivity to previously undetected, fainter mid-IR excesses and (2) remove spurious exce…
Multivariate statistical analysis of OSIRIS/Rosetta spectrophotometric data of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +42 more
Context. The ESA Rosetta mission explored comet 67P/Churyumov-Gerasimenko in 2014-2016, following its target before and after the perihelion passage on 13 August 2015. The NAC camera of the OSIRIS imaging system allowed to map the nucleus surface acquiring images with different filters in the visible wavelength range.
Aims: Here we study the …
Hot prominence detected in the core of a coronal mass ejection. II. Analysis of the C III line detected by SOHO/UVCS
Heinzel, P.; Anzer, U.; Jejčič, S. +3 more
Context. We study the physics of erupting prominences in the core of coronal mass ejections (CMEs) and present a continuation of a previous analysis.
Aims: We determine the kinetic temperature and microturbulent velocity of an erupting prominence embedded in the core of a CME that occurred on August 2, 2000 using the Ultraviolet Coronagraph a…