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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The energy release and build-up processes in the solar corona havesignificant implications in particular for the case of large recurrent flares,which pose challenging questions about the conditions that lead to the episodicenergy release processes. It is not yet clear whether these events occur due tothe continuous supply of free magnetic energy to the solar corona or becausenot all of the available free magnetic energy is released during a single majorflaring event. In order to address this question, we report on the evolution ofphotospheric magnetic field and the associated net Lorentz force changes in ARs11261 and 11283, each of which gave rise to recurrent eruptive M- and X-classflares. Our study reveals that after the abrupt downward changes during eachflare, the net Lorentz force increases by (2-5)x10^22 dyne in between thesuccessive flares. This distinct rebuild-up of net Lorentz forces is the firstobservational evidence found in the evolution of any non-potential parameter ofsolar active regions (ARs), which suggests that new energy was supplied to theARs in order to produce the recurrent large flares. The rebuild-up of magneticfree energy of the ARs is further confirmed by the observations of continuousshearing motion of moving magnetic features of opposite polarities near thepolarity inversion line. The evolutionary pattern of the net Lorentz forcechanges reported in this study has significant implications, in particular, forthe forecasting of recurrent large eruptive flares from the same AR and hencethe chances of interaction between the associated CMEs.

Lorentz Force Evolution Reveals the Energy Buildup Processes during Recurrent Eruptive Solar Flares