Zobrazeno 1 - 10
of 275
pro vyhledávání: '"BOURDIN, Philippe"'
Autor:
Hayakawa, Hisashi, Besser, Bruno P., Iju, Tomoya, Arlt, Rainer, Uneme, Shoma, Imada, Shinsuke, Bourdin, Philippe-A., Kraml, Amand
Publikováno v:
The Astrophysical Journal, 2020
As we are heading towards the next solar cycle, presumably with a relatively small amplitude, it is of significant interest to reconstruct and describe the past grand minima on the basis of actual observations of the time. The Dalton Minimum is often
Externí odkaz:
http://arxiv.org/abs/2001.02367
Autor:
Bourdin, Philippe-A.
The quality of today's research is often tightly limited to the available computing power and scalability of codes to many processors. For example, tackling the problem of heating the solar corona requires a most realistic description of the plasma d
Externí odkaz:
http://arxiv.org/abs/1908.08557
Publikováno v:
Physics of Plasmas 26, 072903 (2019)
We investigate the collective behaviour of particle orbits in the vicinity of magnetic reconnection in Earth's magneto-tail. Various regions of different kinds of orbital stability of particle motions are found. We locate regimes of temporary capture
Externí odkaz:
http://arxiv.org/abs/1907.13478
Autor:
Hofer, Bernhard, Bourdin, Philippe-A.
Publikováno v:
ApJ, 878:30 (6pp), 2019
The electromotive force (EMF) describes how the evolution and generation of a large-scale magnetic field is influenced by small-scale turbulence. Recent studies of in-situ measurements have shown a significant peak in the EMF while a coronal mass eje
Externí odkaz:
http://arxiv.org/abs/1905.02596
Autor:
Bourdin, Philippe
Dans le régime présidentiel de la Ve République, il n'est guère de jour qui ne nous rappelle les relations, parfois incestueuses, qui unissent pouvoir politique et médias sur la scène publique comme dans la sphère privée. Ce constat pessimist
Publikováno v:
ApJ, 869:3 (7pp), 2018
The emergence of dipolar magnetic features on the solar surface is an idealization. Most of the magnetic flux emergence occurs in complex multipolar regions. Here, we show that the surface pattern of magnetic structures alone can reveal the sign of t
Externí odkaz:
http://arxiv.org/abs/1804.04160
Publikováno v:
ApJ, 869:2 (9pp), 2018
Solar and stellar dynamos shed small-scale and large-scale magnetic helicity of opposite signs. However, solar wind observations and simulations have shown that some distance above the dynamo both the small-scale and large-scale magnetic helicities h
Externí odkaz:
http://arxiv.org/abs/1804.04153
Publikováno v:
ApJ, 855:111 (10pp), 2018
Electromotive force is an essential quantity in dynamo theory. During a coronal mass ejection (CME), magnetic helicity gets decoupled from the Sun and advected into the heliosphere with the solar wind. Eventually, a heliospheric magnetic transient ev
Externí odkaz:
http://arxiv.org/abs/1802.10111
Autor:
Bourdin, Philippe-A.
Publikováno v:
ApJL, 850:L29 (5pp), 2017
Plasma beta is an important and fundamental physical quantity in order to understand plasma dynamics, particularly in the context of magnetically active stars, because it tells about the domination of magnetic versus thermodynamic processes on the pl
Externí odkaz:
http://arxiv.org/abs/1711.10965
Autor:
Bourdin, Philippe-A.
Publikováno v:
Ann. Geophys., 35, 1051-1067, 2017
To understand the essential physics needed to reproduce magnetic reconnection events in 2.5-D particle-in-cell (PIC) simulations, we revisit the Geospace Environmental Modeling (GEM) setup. We set up a 2-D Harris current sheet (that also specifies th
Externí odkaz:
http://arxiv.org/abs/1709.05564