E-Print Archive

There are 4249 abstracts currently viewable.


Search:

Advanced Search
Options
Main Page Add New E-Print Submitter
Information
Feedback
News Help/FAQ About Preferences
Manage Key Phrase
Notification
* News 04/04/20 * The archive is using a new backend database. This has thrown up a few SQL errors in the last few days. If you have any issues please email adavey@nso.edu with either the number of eprint you are trying to edit or a link to your preprint.

Magnetic helicity dissipation and production in an ideal MHD code View all abstracts by submitter

Axel Brandenburg   Submitted: 2020-03-17 21:01

Abstract: We study a turbulent helical dynamo in a periodic domain by solving the ideal magnetohydrodynamic (MHD) equations with the FLASH code using the divergence-cleaning eight-wave method and compare our results with direct numerical simulations (DNS) using the Pencil Code. At low resolution, FLASH reproduces the DNS results qualitatively by developing the large-scale magnetic field expected from DNS, but at higher resolution, no large-scale magnetic field is obtained. In all those cases in which a large-scale magnetic field is generated, the ideal MHD results yield too little power at small scales. As a consequence, the small-scale current helicity is too small compared with that of the DNS. The resulting net current helicity has then always the wrong sign, and its statistical average also does not approach zero at late times, as expected from the DNS. Our results have implications for astrophysical dynamo simulations of stellar and galactic magnetism using ideal MHD codes.

Authors: Axel Brandenburg, Evan Scannapieco
Projects: None

Publication Status: Astrophys. J. 889, 55 (2020)
Last Modified: 2020-03-18 13:05
Go to main E-Print page  Accelerated Electrons Observed Down to <7 keV in a NuSTAR Solar Microflare  Magnetic twist profile inside magnetic clouds derived with a superposed epoch analysis  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

Key
Go to main E-Print pageGo to main E-Print page.
Previous AbstractPrevious Abstract.
Next AbstractNext Abstract.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
View All Abstracts By SubmitterView all abstracts by submitter.
Delete AbstractDelete abstract.

Latest Entries
Ambipolar diffusion in the Bifrost code
Modeling the quiet Sun cell and network emission with ALMA
Clustering of fast Coronal Mass Ejections during the solar cycles 23 and 24 and implications for CME-CME interactions
Magnetic and Velocity Field Topology in Active Regions of Descending Phase of the Solar Cycle 23
Numerical simulation of solar photospheric jet-like phenomena caused by magnetic reconnection
Solar Flare-CME Coupling Throughout Two Acceleration Phases of a Fast CME
A new method for estimating global coronal wave properties from their interaction with solar coronal holes
Machine-learning approach to identification of coronal holes in solar disk images and synoptic maps
Multilevel Observations of the Oscillations in the First Active Region of the New Cycle
Standing MHD Waves in a Magnetic Slab Embedded in an Asymmetric Magnetic Plasma Environment: Surface Waves
A new facility for airborne solar astronomy: NASA's WB-57 at the 2017 total solar eclipse
MinXSS-2 CubeSat mission overview: Improvements from the successful MinXSS-1 mission
Lyman α Variability During Solar Flares Over Solar Cycle 24 Using GOES-15/EUVS-E
Sunquake with a second-bounce, other sunquakes and emission associated with X9.3 flare of 6 September 2017. II. Proposed interpretation
f-mode strengthening from a localized bipolar subsurface magnetic field
Imaging and spectral study on the null point of a fan-spine structure during a solar flare
Forecasting Solar Cycle 25 Using Deep Neural Networks
An Observational Test of Solar Plasma Heating by Magnetic Flux Cancellation
The Drivers of Active Region Outflows into the Slow Solar Wind
HXR emission from an activated flux rope and subsequent evolution of an eruptive long duration solar flare

Related Pages
MSU Solar Physics.
Max Millennium Science Mail Archive.
Max Millennium Message of the Day Mail Archive.
Max Millennium Flare Catalog

Archive Maintainer
Alisdair Davey



© 2000-2020 Solar Physics Group - Montana State University