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

Using multi-instrument and multi-wavelength observations, we studied a CMEeruption that led to intense geomagnetic storm on 23 April 2023. The eruptionoccurred on April 21 in solar active region 13283 near the disk-center. The ARwas in its decay stage, with fragmented polarities and a pre-existing longfilament channel, a few days before the eruption. The study of magnetic fieldevolution suggests that the flux-rope (filament) has been built up bymonotonous helicity accumulation over several days, and further converging andcanceling fluxes lead to helicity injection change, resulting in the unstablenature of the magnetic flux-rope (MFR) and its further eruption. Importantly,the CME morphology revealed that the MFR apex underwent a rotation of upto56\degree~in clockwise-direction owing to its positive helicity. The CMEdecelerates in the LASCO-FOV and has a plane-of-sky velocity of 1226 km/s at20\,R$_\odot$. In the Heliospheric Imager FOV, the CME lateral expansion istracked more than the earthward motion. This implies that the arrival timeestimation is difficult to assess. The in-situ arrival of ICME shock was at07:30 UT on April 23, and a geomagnetic storm commenced at 08:30\,UT. The fluxrope fitting to the in-situ magnetic field observations reveals that the MCflux rope orientation is consistent with its near Sun orientation, which has astrong negative Bz-component. The analysis of this study indicates that thenear-Sun rotation of the filament during its eruption to the CME is the key tothe negative Bz-component and consequently the intense geomagnetic storm.

Filament eruption from active region 13283 leading to fast halo-CME and intense geomagnetic storm on 23 April 2023