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Impulsive plasma outflows due to wave driven magnetic reconnection View all abstracts by submitter

Gerry Doyle   Submitted: 2017-05-15 11:11

We study an impulsive plasma outflow in the quiet-Sun using multi-wavelength observations from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) on 2011 March 30. The outflow rises to the upper solar atmosphere with a high terminal speed of 1250 km s-1. Emissions from multiple SDO/AIA channels (log T (K) = 4.7 to log T (K) = 7.0), peak at the same time indicating its highly impulsive origin. We obtain the line-of-sight differential emission measure (DEM) maps and find that the outflow is made up of multi-temperature plasma. Investigation of SDO/HMI magnetic field data at its foot-point shows that the emerging flux of negative polarity is oscillating at the period of 416 sec. The oscillations are also observed in the intensity of 1600A almost co-temporally near the base of the outflow with the almost same period (~442 sec). The ~7.0 min periodicity respectively in the magnetic flux at the photosphere and 1600A flux at the chromosphere/TR height is present both prior to and during the onset, and even after the outflows for the duration of ~1 hr. This indicates that the waves are generated and present at the base of the outflow interacting with the localised small-scale current-sheet thus leading to magnetic reconnection and the impulsive outflows. Observed magnetoacoustic waves may see the discontinuity at the X-point which may develop into fast oblique magnetic shocks leading to the local heating due to the reconnection and compression at the X-point and forming a shock-cusp enabling hot plasma outflows.

Authors: Yamini K. Rao, A.K. Srivastava, J.G. Doyle and Bhola N. Dwivedi
Projects: SDO-AIA

Publication Status: MNRAS (in press)
Last Modified: 2017-05-18 11:32
Go to main E-Print page  CME dynamics using STEREO & LASCO observations: the relative importance of Lorentz forces and solar wind drag  Propagation of Torsional Alfv?n Waves from the Photosphere to the Corona: Reflection, Transmission, and Heating in Expanding Flux Tubes  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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