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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Supra-arcade downflows (SADs) are dark structures descending towardspost-reconnection flare loops observed in extreme ultraviolet or X-rayobservations and are closely related to magnetic reconnection during solarflares. Due to the lack of statistical study on SADs in a single flare,evolutions of kinematic and thermal properties of SADs during the flare processstill remain obscure. In this work, we identified 81 SADs in a flare thatoccurred on 2013 May 22 using observations of the Atmospheric Imaging Assembly(AIA) on the Solar Dynamics Observatory (SDO). The kinematic properties of eachSAD, including the appearance time, height, projective velocity, andacceleration were recorded. We found that the appearance heights of SADs becomelarger during the flare, which is likely due to the lift of the bottom of theplasma sheet. In the flare decay phase, the region where SADs mainly appearmoves from the north part to the south side possibly related to a secondaryeruption in the south side. The trajectories of most SADs can be fitted by oneor two deceleration processes, while some special ones have positiveaccelerations during the descent. For the thermal properties, we selected 54SADs, whose front and body could be clearly distinguished from the surroundingduring the entire descent, to perform Differential Emission Measure analysis.It is revealed that the temperatures of the SAD front and body tend to increaseduring their downward courses, and the relationship between the density andtemperature indicates that the heating is mainly caused by adiabaticcompression.

Statistical Investigation of the Kinematic and Thermal Properties of Supra-arcade Downflows Observed During a Solar Flare