Slow Magnetoacoustic Wave Oscillation of an Expanding Coronal Loop

Details Slow Magnetoacoustic Wave Oscillation of an Expanding Coronal Loop Slow Magnetoacoustic Wave Oscillation of an Expanding Coronal Loop

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...739...75s&link_type=abstract

The Astrophysical Journal, Volume 739, Issue 2, article id. 75 (2011).

Astronomy and Astrophysics

Astronomy

Magnetic Fields, Magnetohydrodynamics: Mhd, Methods: Numerical, Solar Wind, Sun: Corona, Sun: Coronal Mass Ejections: Cmes, Sun: Photosphere

Scientific paper

We simulated an expanding loop or slow coronal mass ejection (CME) in the solar corona dimensioned with size parameters taken from real coronal expanding loops observed with the STEREO spacecraft. We find that the loop expands to Sun's size within about one hour, consistent with slow CME observations. At the top of the loop, plasma is being blown off the loop, enabled with the reconnection between the loop's flux rope magnetic field and the radial magnetic field of the Sun, thus yielding feeding material for the formation of the slow solar wind. This mechanism is in accordance with the observed blob formation of the slow solar wind. We find wave packets traveling with local sound speed downward toward the footpoints of the loop, already seen in coronal seismology observations and simulations of stationary coronal loops. Here, we generalize these results for an expanding medium. We also find a reflection of the wave packets, identified as slow magnetoacoustic waves, at the footpoints of the loop. This confirms the formation of standing waves within the coronal loop. In particular, the reflected waves can partly escape the loop top and contribute to the heating of the solar wind. The present study improves our understanding on how loop material can emerge to form blobs, major ingredients of slow CMEs, and how the release of the wave energy stored in slow magnetoacoustic waves, and transported away from the Sun within expanding loops, contributes to the acceleration and formation of the slow solar wind.

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