منابع مشابه
Coronal ion-cyclotron beam instabilities within the multi-fluid description
Context. Spectroscopic observations and theoretical models suggest resonant wave-particle interactions, involving high-frequency ion-cyclotron waves, as the principal mechanism for heating and accelerating ions in the open coronal holes. However, the mechanism responsible for the generation of the ion-cyclotron waves remains unclear. One possible scenario is that ion beams originating from smal...
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We investigate the nonlinear development of ideal kink instabilities in a line-tied coronal loop, using a three dimensional numerical code. In order to understand how the equilibrium loop properties affect nonlinear evolution, various different initial magnetic equilibria are considered. In most cases, a finescale magnetic field structure is shown to develop. However, the corresponding electric...
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A simple, yet powerful, algorithm for computed tomography of the solar corona is demonstrated using synthetic EUV data. A minimum of three perspectives are required. These may be obtained from STEREO/EUVI plus an instrument near Earth, e.g. TRACE or SOHO/EIT. Subject headings: methods: data analysis — Sun: corona — techniques: image processing
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Coronal holes are the darkest and least active regions of the Sun, as observed both on the solar disk and above the solar limb. Coronal holes are associated with rapidly expanding open magnetic fields and the acceleration of the high-speed solar wind. This paper reviews measurements of the plasma properties in coronal holes and how these measurements are used to reveal details about the physica...
متن کاملCoronal Cells
We have recently noticed cellular features in Fe xii 193 Å images of the 1.2 MK corona. They occur in regions bounded by a coronal hole and a filament channel, and are centered on flux elements of the photospheric magnetic network. Like their neighboring coronal holes, these regions have minority-polarity flux that is ∼0.1–0.3 times their flux of majority polarity. Consequently, the minority-po...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1989
ISSN: 1539-2996
DOI: 10.1017/s1539299600008236