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Category/Subcategory: Natural Sciences/Physics

Mechanism of mean flow generation in rotating turbulence and its relation to inertial wave

Author: Kazuhiro INAGAKI
Recent numerical simulation revealed that large-scale flow is generated in a rotating system with inhomogeneous helicity. However its mechanism was not examined in terms of the Reynolds stress transport. In this study, the large-e ... more

Views: 81

Field line helicity as a tool for coronal physics

Author: Anthony Yeates
What if there were a way to identify **where** the magnetic helicity is concentrated within a three- dimensional magnetic field? At first sight this question appears meaningless, since magnetic helicity is an integral over the who ... more

Views: 467

Exceptions to the rule: the X-flares of AR 2192 lacking coronal mass ejections

Author: Manuela Temmer
The unusually large NOAA active region (AR) 2192, observed in October and November 2014, was outstanding in its productivity of major flares (GOES class M5 and larger). However, none of the X-flares was associated to a coronal mas ... more

Views: 477

Magnetic helicity in turbulent reconnection

Author: Fabien Widmer
Collision-less large-Reynolds-number astrophysical plasmas are prone to turbulence. In this context, it is necessary to consider the impact of turbulence during believed magnetic reconnection events in solar and stellar flares o ... more

Views: 458

Tracking of photospheric shock waves in computational fluid dynamics data

Author: Peter Leitner
Simulations of the solar convection including radiation transport allow us to examine and track photospheric shock waves in detail unparalleled by direct observation. It is still not clear which processes trigger shocks and how si ... more

Views: 131

Inverse transfer of Magnetic Energy in a decaying MHD system

Author: Kiwan Park
In our conventional understanding, large-scale magnetic fields are thought to originate from an inverse cascade in the presence of magnetic helicity, differential rotation or a magneto-rotational instability. However, as recent si ... more

Views: 69

Extension to Spherical Geometry - Sensitivity Kernels for Flows in Time-Distance Helioseismology

Author: Vincent Böning
We extend an existing Born approximation model for calculating the linear sensitivity of helioseismic travel-times to flows from plane-parallel to spherical geometry. This extension is necessary especially for dealing with deep fl ... more

Views: 326

Flow generation by helicity and angular-momentum transport in the Sun

Author: Nobumitsu Yokoi
Turbulent helicity (velocity–vorticity correlation) represents breaking mirror-symmetry in turbulence. With the aid of an analytical statistical theory for inhomogeneous turbulence, an expression of the Reynolds stress in non-mi ... more

Views: 151

The EST status

Author: Manuel Collados
EST will be the largest solar telescope ever built in Europe. With a 4-metre primary mirror and state-of-the-art technology, it will furnish astronomers with a unique tool to understand the Sun. The main goal of EST is to investig ... more

Views: 28

Solar Flares and Eruptive Events with EST

Author: Lyndsay Fletcher
The European Solar Telescope offers unique and novel opportunities for solving some of the long-standing problems related to solar flares, such as the slow evolution of the stored energy preceding the flare, the rapid deposition ... more

Views: 18