English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Where particle acceleration and plasma heating take place in relation tomagnetic reconnection is a fundamental question for solar flares. We reportanalysis of an M7.7 flare on 2012 July 19 observed by SDO/AIA and RHESSI.Bi-directional outflows in forms of plasmoid ejections and contractingcusp-shaped loops originate between an erupting flux rope and underlying flareloops at speeds of typically 200-300 km/s up to 1050 km/s. These outflows areassociated with spatially separated double coronal X-ray sources with centroidseparation decreasing with energy. The highest temperature is located near thenonthermal X-ray loop-top source well below the original heights of contractingcusps near the inferred reconnection site. These observations suggest that theprimary loci of particle acceleration and plasma heating are in thereconnection outflow regions, rather than the reconnection site itself. Inaddition, there is an initial ascent of the X-ray and EUV loop-top source priorto its recently recognized descent, which we ascribe to the interplay amongmultiple processes including the upward development of reconnection and thedownward contractions of reconnected loops. The impulsive phase onset isdelayed by 10 minutes from the start of the descent, but coincides with therapid speed increases of the upward plasmoids, the individual loop shrinkages,and the overall loop-top descent, suggestive of an intimate relation of theenergy release rate and reconnection outflow speed.

astrophysical journal/the astrophysical journal

Plasmoid Ejections and Loop Contractions in an Eruptive M7.7 Solar  Flare: Evidence of Particle Acceleration and Heating in Magnetic Reconnection  Outflows