Topological Structures of Velocity and Electric Field in the Vicinity of a Cusp-type Magnetic Null Point
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00511581" target="_blank" >RIV/67985815:_____/19:00511581 - isvavai.cz</a>
Result on the web
<a href="http://hdl.handle.net/11104/0301817" target="_blank" >http://hdl.handle.net/11104/0301817</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/ab020b" target="_blank" >10.3847/1538-4357/ab020b</a>
Alternative languages
Result language
angličtina
Original language name
Topological Structures of Velocity and Electric Field in the Vicinity of a Cusp-type Magnetic Null Point
Original language description
Topological characteristics reveal important physical properties of plasma structures and astrophysical processes. Physical parameters and constraints are linked with topological invariants, which are important for describing magnetic reconnection scenarios. We analyze stationary nonideal Ohm's law concerning the Poincare classes of all involved physical fields in two dimensions by calculating the corresponding topological invariants of their Jacobian (here: particularly the eigenvalues) or Hessian matrices. The magnetic field is assumed to have a cusp structure, and the stagnation point of the plasma flow coincides with the cusp. We find that the stagnation point must be hyperbolic. Furthermore, the functions describing both the resistivity and the ohmic heating have a saddle-point structure, being displaced with respect to the cusp point. These results imply that there is no monotonous relation between current density and anomalous resistivity in the case of a two-dimensional standard magnetic cusp.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA16-05011S" target="_blank" >GA16-05011S: The role of singular points for magnetic reconnection in solar and space plasmas</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal
ISSN
1538-4357
e-ISSN
—
Volume of the periodical
873
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
41
UT code for WoS article
000460136100009
EID of the result in the Scopus database
2-s2.0-85063570871