High resolution mapping of the magnetic field of the solar corona

Solar Physics ◽  
1977 ◽  
Vol 51 (2) ◽  
pp. 345-375 ◽  
Author(s):  
Martin D. Altschuler ◽  
Randolph H. Levine ◽  
Michael Stix ◽  
John Harvey
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Solar Corona ◽  
High Resolution Mapping ◽  
Resolution Mapping ◽  
The Magnetic Field

scholarly journals High Resolution Observations of the Solar Corona

1992 ◽  
Vol 9 ◽  
pp. 659-660
Author(s):  
D. Gomez ◽  
L. Golub
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Solar Corona ◽  
Magnetic Energy ◽  
Intimate Relationship ◽  
X Ray ◽  
Physical Mechanisms ◽  
Convective Motions ◽  
The Magnetic Field ◽  
Intense Source

Soft X-ray images of the solar corona obtained during the last 20 years have systematically shown an intimate relationship between intense emitting structures and magnetic fields (Vaiana and Rosner 1978). The magnetic field confines a 106 K plasma, which is an intense source of soft X-ray photons. Therefore, it is natural to expect the bright X-ray structures to follow the field’s geometry. But this relationship does not seem to be just geometrical. It is generally believed that the energy necessary to heat the plasma comes from the dissipation of magnetic stresses, which are continually being re-generated by subphotospheric convective motions. However, there is still great uncertainty about the precise physical mechanisms involved in the production and release of the magnetic energy.

scholarly journals Overdense Threads in the Solar Corona Induced by Torsional Alfvén Waves

2021 ◽  
Vol 922 (2) ◽  
pp. L26
Author(s):  
Sergio Díaz-Suárez ◽  
Roberto Soler
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Solar Corona ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Proof Of Concept ◽  
Phase Mixing ◽  
Synthetic Modeling ◽  
The Magnetic Field ◽  
High Cadence

Abstract High-resolution and high-cadence observations have shown that Alfvén waves are ubiquitous in the solar atmosphere. Theoretical works suggest their ability to transfer large energy fluxes from the photosphere to the corona and solar wind. In this proof-of-concept Letter we show that torsional Alfvén waves can induce the formation of filamentary plasma structures in the solar corona. We perform high-resolution 3D ideal MHD simulations in an initially uniform coronal plasma permeated by a line-tied twisted magnetic field. We find that torsional Alfvén waves develop Kelvin–Helmholtz instabilities as a result of the phase mixing process. The Kelvin–Helmholtz instability drives plasma compression that breaks the uniformity of density, creating elongated overdense threads aligned with the direction of the magnetic field. With synthetic modeling of SDO/AIA imaging we show that the overdense filaments could be seen in observations as fine strands that illuminate the underlying magnetic structure.

A Super-High-Resolution HVEM (H-1500) Newly Installed in NIRIM

1990 ◽  
Vol 48 (1) ◽  
pp. 142-143
Author(s):  
S. Horiuchi ◽  
Y. Matsui
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Chromatic Aberration ◽  
Inorganic Materials ◽  
Electron Gun ◽  
Resolving Power ◽  
National Budget ◽  
Voltage Electron ◽  
Specimen Holder ◽  
The Magnetic Field

A new high-voltage electron microscope (H-1500) specially aiming at super-high-resolution (1.0 Å point-to-point resolution) is now installed in National Institute for Research in Inorganic Materials ( NIRIM ), in collaboration with Hitachi Ltd. The national budget of about 1 billion yen including that for a new building has been spent for the construction in the last two years (1988-1989). Here we introduce some essential characteristics of the microscope.(1) According to the analysis on the magnetic field in an electron lens, based on the finite-element-method, the spherical as well as chromatic aberration coefficients ( Cs and Cc ). which enables us to reach the resolving power of 1.0Å. have been estimated as a function of the accelerating As a result of the calculaton. it was noted that more than 1250 kV is needed even when we apply the highest level of the technology and materials available at present. On the other hand, we must consider the protection against the leakage of X-ray. We have then decided to set the conventional accelerating voltage at 1300 kV. However. the maximum accessible voltage is 1500 kV, which is practically important to realize higher voltage stabillity. At 1300 kV it is expected that Cs= 1.7 mm and Cc=3.4 mm with the attachment of the specimen holder, which tilts bi-axially in an angle of 35° ( Fig.1 ). In order to minimize the value of Cc a small tank is additionally placed inside the generator tank, which must serve to seal the magnetic field around the acceleration tube. An electron gun with LaB6 tip is used.

ANATOMY OF A LARGE IMPACT CRATER ON A DWARF PLANET: XM2 INITIAL HIGH-RESOLUTION MAPPING OF OCCATOR CRATER FROM DAWN

2018 ◽  
Author(s):  
Paul M. Schenk ◽  
◽  
Britney E. Schmidt ◽  
Hanna G. Sizemore ◽  
Carle M. Pieters ◽  
...  
Keyword(s):  
High Resolution ◽  
Impact Crater ◽  
Large Impact ◽  
High Resolution Mapping ◽  
Resolution Mapping

scholarly journals High-resolution mapping of the atria using the HD Grid catheter

2019 ◽  
Vol 5 (7) ◽  
pp. 351-353 ◽  
Author(s):  
Kathryn Lauren Hong ◽  
Damien Redfearn ◽  
Sanoj Chacko ◽  
Jason Baley ◽  
Adrian Baranchuk ◽  
...  
Keyword(s):  
High Resolution ◽  
High Resolution Mapping ◽  
Resolution Mapping
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