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291 papers · 1 filter
Correcting the effect of magnetic tongues on the tilt angle of bipolar active regions
M. Poisson, M. C. López Fuentes, C. H. Mandrini +2
The magnetic polarities of bipolar active regions (ARs) exhibit elongations in line-of-sight magnetograms during their emergence. These elongations are referred to as magnetic tong…
Final Spitzer IRAC Observations of the Rise and Fall of SN 1987A
Richard G. Arendt, Eli Dwek, Patrice Bouchet +4
Spitzer's final Infrared Array Camera (IRAC) observations of SN 1987A show the 3.6 and 4.5 m emission from the equatorial ring (ER) continues a period of steady decline. Deconvo…
The nitrogen operating space of world food production
Souhil Harchaoui, Petros Chatzimpiros
Agriculture operates within a global ecosystem for which planetary boundaries have recently been defined. Efficiency in nitrogen use is essential for maximizing the benefits of agr…
Structural and Dynamical Analysis of 0.1pc Cores and Filaments in the 30~Doradus-10 Giant Molecular Cloud
Remy Indebetouw, Tony Wong, C. -H. Rosie Chen +4
High-resolution (0.1pc) ALMA observations of the 30Dor-10 molecular cloud 15pc north of R136 are presented. The CO 2-1 emission morphology contains clumps near the locati…
Re-analysis of Lepping's Fitting Method for Magnetic Clouds: Lundquist Fit Reloaded
P. Démoulin, S Dasso, M. Janvier +1
Magnetic clouds (MCs) are a subset of ejecta, launched from the Sun as coronal mass ejections. The coherent rotation of the magnetic field vector observed in MCs leads to envision…
Magnetic geometry and surface differential rotation of the bright Am star Alhena A
Aurore Blazère, Pascal Petit, Coralie Neiner +5
Alhena A ( Gem A) is a bright Am star, with the strongest disc-integrated magnetic field strength reported so far for an Am star. Its spectrum exhibits standard circularly polar…