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Title: GROWING TRANSVERSE OSCILLATIONS OF A MULTISTRANDED LOOP OBSERVED BY SDO/AIA

Abstract

The first evidence of transverse oscillations of a multistranded loop with growing amplitudes and internal coupling observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory is presented. The loop oscillation event occurred on 2011 March 8, triggered by a coronal mass ejection (CME). The multiwavelength analysis reveals the presence of multithermal strands in the oscillating loop, whose dynamic behaviors are temperature-dependent, showing differences in their oscillation amplitudes, phases, and emission evolution. The physical parameters of growing oscillations of two strands in 171 A are measured and the three-dimensional loop geometry is determined using STEREO-A/EUVI data. These strands have very similar frequencies, and between two 193 A strands a quarter-period phase delay sets up. These features suggest the coupling between kink oscillations of neighboring strands and the interpretation by the collective kink mode as predicted by some models. However, the temperature dependence of the multistranded loop oscillations was not studied previously and needs further investigation. The transverse loop oscillations are associated with intensity and loop width variations. We suggest that the amplitude-growing kink oscillations may be a result of continuous non-periodic driving by magnetic deformation of the CME, which deposits energy into the loop system at a ratemore » faster than its loss.« less

Authors:
; ;  [1]
  1. Department of Physics, Catholic University of America, 620 Michigan Avenue NE, Washington, DC 20064 (United States)
Publication Date:
OSTI Identifier:
22047794
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 751; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ASTRONOMY; ASTROPHYSICS; COUPLING; MAGNETISM; MASS; OSCILLATIONS; PERIODICITY; PHOTON EMISSION; STAR EVOLUTION; SUN; TEMPERATURE DEPENDENCE; THREE-DIMENSIONAL CALCULATIONS; ULTRAVIOLET RADIATION

Citation Formats

Wang, Tongjiang, Ofman, Leon, Su, Yang, and Davila, Joseph M., E-mail: tongjiang.wang@nasa.gov. GROWING TRANSVERSE OSCILLATIONS OF A MULTISTRANDED LOOP OBSERVED BY SDO/AIA. United States: N. p., 2012. Web. doi:10.1088/2041-8205/751/2/L27.
Wang, Tongjiang, Ofman, Leon, Su, Yang, & Davila, Joseph M., E-mail: tongjiang.wang@nasa.gov. GROWING TRANSVERSE OSCILLATIONS OF A MULTISTRANDED LOOP OBSERVED BY SDO/AIA. United States. https://doi.org/10.1088/2041-8205/751/2/L27
Wang, Tongjiang, Ofman, Leon, Su, Yang, and Davila, Joseph M., E-mail: tongjiang.wang@nasa.gov. 2012. "GROWING TRANSVERSE OSCILLATIONS OF A MULTISTRANDED LOOP OBSERVED BY SDO/AIA". United States. https://doi.org/10.1088/2041-8205/751/2/L27.
@article{osti_22047794,
title = {GROWING TRANSVERSE OSCILLATIONS OF A MULTISTRANDED LOOP OBSERVED BY SDO/AIA},
author = {Wang, Tongjiang and Ofman, Leon and Su, Yang and Davila, Joseph M., E-mail: tongjiang.wang@nasa.gov},
abstractNote = {The first evidence of transverse oscillations of a multistranded loop with growing amplitudes and internal coupling observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory is presented. The loop oscillation event occurred on 2011 March 8, triggered by a coronal mass ejection (CME). The multiwavelength analysis reveals the presence of multithermal strands in the oscillating loop, whose dynamic behaviors are temperature-dependent, showing differences in their oscillation amplitudes, phases, and emission evolution. The physical parameters of growing oscillations of two strands in 171 A are measured and the three-dimensional loop geometry is determined using STEREO-A/EUVI data. These strands have very similar frequencies, and between two 193 A strands a quarter-period phase delay sets up. These features suggest the coupling between kink oscillations of neighboring strands and the interpretation by the collective kink mode as predicted by some models. However, the temperature dependence of the multistranded loop oscillations was not studied previously and needs further investigation. The transverse loop oscillations are associated with intensity and loop width variations. We suggest that the amplitude-growing kink oscillations may be a result of continuous non-periodic driving by magnetic deformation of the CME, which deposits energy into the loop system at a rate faster than its loss.},
doi = {10.1088/2041-8205/751/2/L27},
url = {https://www.osti.gov/biblio/22047794}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 751,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2012},
month = {Fri Jun 01 00:00:00 EDT 2012}
}