Model calculations of the rising motion of a prominence loop

✍ Scribed by Tyan Yeh; S. T. Wu

• Publisher: Springer
• Year: 1991
• Tongue: English
• Weight: 724 KB
• Volume: 132
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00152292

✦ Synopsis

Model calculations are presented for the rising motion of the top section of a prominence loop, which is represented by a straight flux rope immersed in a coronal medium permeated with a bipolar magnetic field. Initially the prominence is at rest, in equilibrium with the surrounding coronal medium. When the magnetic monopoles that account for the source current for the bipolar field strengthen, the upward hydromagnetic buoyancy force overcomes the downward gravitational force so that the prominence is initiated into rising motion. The illustrative examples show that prominences can move away from the solar surface by the action of the hydromagnetic buoyancy force, which is preponderant with the diamagnetic force due to the current carried by the prominence interacting with the coronal magnetic field produced by the photospheric currents, if the changes in the photospheric magnetic field are sufficiently large.