Coronal Magnetic Fields
نویسندگان
چکیده
منابع مشابه
Radio Measurements of Coronal Magnetic Fields
The measurement of magnetic field strengths in the solar corona using radio observations is reviewed. This is a well established technique that exploits the fact that the electron gyrofrequency for typical coronal magnetic field strengths (100–2000 Gauss) lies in the radio frequency range. Opacity from the resulting gyroresonance emission from hot plasma above active regions allows the direct m...
متن کاملStellar coronal magnetic fields and star-planet interaction
Context. Evidence of magnetic interaction between late-type stars and close-in giant planets is provided by the observations of stellar hot spots rotating synchronously with the planets and showing an enhancement of chromospheric and X-ray fluxes. Possible photospheric signatures of such an interaction have also been reported. Aims. We investigate star-planet interaction in the framework of a m...
متن کاملCoronal potential magnetic fields from photospheric sources with finite width
Finite width photospheric sources are used to generate coronal potential magnetic field configurations. The prescription of a suitable distribution of the magnetic flux function within such regions allows to solve the Grad-Shafranov equation and, using the superposition principle, to obtain magnetic field configurations related to arbitrary combinations of photospheric sources and sinks. Follow...
متن کاملRadio Observations of Gyroresonance Emission from Coronal Magnetic Fields
We review the basic characteristics of thermal gyroresonance (also known as cyclotron) emission from solar active regions, and show how radio observations combined with our understanding of the basic mechanism can reveal much of the magnetic and thermal structure of the corona over active regions.
متن کاملDefining and Calculating Self-Helicity in Coronal Magnetic Fields
We introduce two different generalizations of relative helicity which may be applied to a portion of the coronal volume. Such a quantity is generally referred to as the self-helicity of the field occupying the sub-volume. Each definition is a natural application of the traditional relative helicity but relative to a different reference field. One of the generalizations, which we term additive s...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1986
ISSN: 1539-2996
DOI: 10.1017/s1539299600006754