The underlying Parker spiral structure in the Ulysses magnetic field observations, 1990-1994

1996 ◽  
Vol 101 (A1) ◽  
pp. 395-403 ◽  
Author(s):  
R. J. Forsyth ◽  
A. Balogh ◽  
E. J. Smith ◽  
G. Erdös ◽  
D. J. McComas
Keyword(s):  
Magnetic Field ◽  
Spiral Structure ◽  
Field Observations ◽  
Parker Spiral

Magnetic Field Spectroheliograms from the San Fernando Observatory

1971 ◽  
Vol 43 ◽  
pp. 329-339 ◽  
Author(s):  
Dale Vrabec
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Spiral Structure ◽  
Longitudinal Component ◽  
Solar Telescope ◽  
Solar Magnetic Fields ◽  
San Fernando ◽  
Field Lines ◽  
The Magnetic Field ◽  
Field Network

Zeeman spectroheliograms of photospheric magnetic fields (longitudinal component) in the CaI 6102.7 Å line are being obtained with the new 61-cm vacuum solar telescope and spectroheliograph, using the Leighton technique. The structure of the magnetic field network appears identical to the bright photospheric network visible in the cores of many Fraunhofer lines and in CN spectroheliograms, with the exception that polarities are distinguished. This supports the evolving concept that solar magnetic fields outside of sunspots exist in small concentrations of essentially vertically oriented field, roughly clumped to form a network imbedded in the otherwise field-free photosphere. A timelapse spectroheliogram movie sequence spanning 6 hr revealed changes in the magnetic fields, including a systematic outward streaming of small magnetic knots of both polarities within annular areas surrounding several sunspots. The photospheric magnetic fields and a series of filtergrams taken at various wavelengths in the Hα profile starting in the far wing are intercompared in an effort to demonstrate that the dark strands of arch filament systems (AFS) and fibrils map magnetic field lines in the chromosphere. An example of an active region in which the magnetic fields assume a distinct spiral structure is presented.

scholarly journals OGO-A magnetic field observations

1967 ◽  
Vol 72 (21) ◽  
pp. 5417-5471 ◽  
Author(s):  
J. P. Heppner ◽  
M. Sugiura ◽  
T. L. Skillman ◽  
B. G. Ledley ◽  
M. Campbell
Keyword(s):  
Magnetic Field ◽  
Field Observations

Global coronal and heliospheric magnetic field modelling for Solar Orbiter

2021 ◽  
Author(s):  
Thomas Wiegelmann ◽  
Thomas Neukirch ◽  
Iulia Chifu ◽  
Bernd Inhester
Keyword(s):  
Magnetic Field ◽  
Solar Rotation ◽  
Coronal Magnetic Field ◽  
Important Research ◽  
Parker Spiral ◽  
Important Research Topic ◽  
Mhd Equilibria ◽  
Solar Wind Flow ◽  
Nonlinear Force

<p>Computing the solar coronal magnetic field and plasma<br>environment is an important research topic on it's own right<br>and also important for space missions like Solar Orbiter to<br>guide the analysis of remote sensing and in-situ instruments.<br>In the inner solar corona plasma forces can be neglected and<br>the field is modelled under the assumption of a vanishing<br>Lorentz-force. Further outwards (above about two solar radii)<br>plasma forces and the solar wind flow has to be considered.<br>Finally in the heliosphere one has to consider that the Sun<br>is rotating and the well known Parker-spiral forms.<br>We have developed codes based on optimization principles<br>to solve nonlinear force-free, magneto-hydro-static and<br>stationary MHD-equilibria. In the present work we want to<br>extend these methods by taking the solar rotation into account.</p>

Wide frequency magnetic field sensor based on Archimedes spiral structure

2021 ◽  
Author(s):  
Fan jiawei ◽  
Long zhaozhi ◽  
Li wenting ◽  
Liu Shaobo ◽  
Zhou Feng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spiral Structure ◽  
Magnetic Field Sensor ◽  
Archimedes Spiral ◽  
Frequency Magnetic Field ◽  
Field Sensor

On the possibility to determine the electrical conductivity of 67P/CG from ROSETTA magnetic field observations

2012 ◽  
Vol 65 (1) ◽  
pp. 1-9
Author(s):  
O.D. Constantinescu ◽  
K.-H. Glassmeier ◽  
U. Auster ◽  
I. Richter ◽  
K.-H. Fornaçon ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Field Observations

Three-dimensional Multispecies Simulation of the Solar Wind Interaction with Mars Under Different Interplanetary Magnetic Field Orientations

2021 ◽  
Vol 921 (2) ◽  
pp. 139
Author(s):  
Yun Li ◽  
Haoyu Lu ◽  
Jinbin Cao ◽  
Shibang Li ◽  
Christian Mazelle ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Interplanetary Magnetic Field ◽  
Three Dimensional ◽  
Polarity Reversal ◽  
Solar Wind Interaction ◽  
Magnetic Structures ◽  
Parker Spiral ◽  
Global Configuration ◽  
Spiral Angle

Abstract Without the intrinsic magnetic field, the solar wind interaction with Mars can be significantly different from the interaction with Earth and other magnetized planets. In this paper, we investigate how a global configuration of the magnetic structures, consisting of the bow shock, the induced magnetosphere, and the magnetotail, is modulated by the interplanetary magnetic field (IMF) orientation. A 3D multispecies numerical model is established to simulate the interaction of solar wind with Mars under different IMF directions. The results show that the shock size including the subsolar distance and the terminator radius increases with Parker spiral angle, as is the same case with the magnetotail radius. The location and shape of the polarity reversal layer and inverse polarity reversal layer in the induced magnetotail are displaced to the y < 0 sector for a nonzero flow-aligned IMF component, consistent with previous analytical solutions and observations. The responses of the Martian global magnetic configuration to the different IMF directions suggest that the external magnetic field plays an important role in the solar wind interaction with unmagnetized planets.

scholarly journals Planetary Period Oscillations in Saturn's Magnetosphere: Cassini Magnetic Field Observations Over the Northern Summer Solstice Interval

2018 ◽  
Vol 123 (5) ◽  
pp. 3859-3899 ◽  
Author(s):  
G. Provan ◽  
S. W. H. Cowley ◽  
T. J. Bradley ◽  
E. J. Bunce ◽  
G. J. Hunt ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Observations ◽  
Summer Solstice ◽  
Northern Summer
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