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Analysis of the radiative budget of the Venusian atmosphere based on infrared Net Exchange Rate formalism
Lebonnois, Sébastien; Eymet, Vincent; Vatant d'Ollone, Jan +1 more
A detailed one-dimensional analysis of the energy balance in Venus atmosphere is proposed in this work, based on the Net Exchange Rate formalism that allows the identification in each altitude region of the dominant energy exchanges controlling the temperature. Well-known parameters that control the temperature profile are the solar flux depositio…
Is Flux Rope a Necessary Condition for the Progenitor of Coronal Mass Ejections?
Ouyang, Y.; Yang, K.; Chen, P. F.
A magnetic flux rope structure is believed to exist in most coronal mass ejections (CMEs). However, it has been long debated whether the flux rope exists before eruption or if it is formed during eruption via magnetic reconnection. The controversy has continued because of our lack of routine measurements of the magnetic field in the pre-eruption s…
Robustness of cosmic neutrino background detection in the cosmic microwave background
Verde, Licia; Tram, Thomas; Cuesta, Antonio J. +9 more
The existence of a cosmic neutrino background can be probed indirectly by CMB experiments, not only by measuring the background density of radiation in the universe, but also by searching for the typical signatures of the fluctuations of free-streaming species in the temperature and polarisation power spectrum. Previous studies have already propos…
Phase-resolved NuSTAR and Swift-XRT Observations of Magnetar 4U 0142+61
An, Hongjun; Kaspi, Victoria M.; Guillot, Sebastien +12 more
We present temporal and spectral analysis of simultaneous 0.5-79 keV Swift-XRT and Nuclear Spectroscopic Telescope Array observations of the magnetar 4U 0142+61. The pulse profile changes significantly with photon energy between 3 and 35 keV. The pulse fraction increases with energy, reaching a value of ≈20%, similar to that observed in 1E 1841-04…
Rosetta begins its Comet Tale
Fulle, M.; Alexander, C.; Fulchignoni, M. +4 more
Simultaneous field-aligned currents at Swarm and Cluster satellites
Dunlop, M. W.; Carr, C. M.; Bogdanova, Y. V. +13 more
We show for the first time, with direct, multispacecraft calculations of electric current density, and other methods, matched signatures of field-aligned currents (FACs) sampled simultaneously near the ionosphere at low (~500 km altitude) orbit and in the magnetosphere at medium (~2.5 RE altitude) orbits using a particular Swarm and Clu…
A Survey of Irradiated Pillars, Globules, and Jets in the Carina Nebula
Smith, N.; Bally, J.; Hartigan, P. +1 more
We present wide-field, deep narrowband H2, Brγ, Hα, [S ii], [O iii], and broadband I- and K-band images of the Carina star formation region. The new images provide a large-scale overview of all the H2 and Brγ emission present in over a square degree centered on this signature star-forming complex. By comparing these images wi…
Measurements of the Mean Diffuse Galactic Light Spectrum in the 0.95-1.65 µm Band from CIBER
Lee, H. M.; Bock, J.; Cooray, A. +14 more
We report measurements of the diffuse galactic light (DGL) spectrum in the near-infrared, spanning the wavelength range 0.95-1.65 µm by the Cosmic Infrared Background ExpeRiment. Using the low-resolution spectrometer calibrated for absolute spectro-photometry, we acquired long-slit spectral images of the total diffuse sky brightness toward s…
Kinetic simulations of secondary reconnection in the reconnection jet
Sahraoui, F.; Aunai, N.; Deng, X. H. +8 more
Magnetic reconnection, as one important energy dissipation process in plasmas, has been extensively studied in the past several decades. Magnetic reconnection occurring in the downstream of a primary X line is referred to as secondary reconnection. In this paper, we used kinetic simulations to investigate the secondary reconnection in detail. We f…
An automated classification approach to ranking photospheric proxies of magnetic energy build-up
McAteer, R. T. J.; Al-Ghraibah, A.; Boucheron, L. E.
Aims: We study the photospheric magnetic field of ~2000 active regions over solar cycle 23 to search for parameters that may be indicative of energy build-up and its subsequent release as a solar flare in the corona.
Methods: We extract three sets of parameters: (1) snapshots in space and time: total flux, magnetic gradients, and neutral…