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

The Interface Region Imaging Spectrograph(IRIS) with its high spatial andtemporal resolution brings exceptional plasma diagnostics of solarchromospheric and coronal activity during magnetic reconnection. The aim ofthis work is to study the fine structure and dynamics of the plasma at a jetbase forming a mini flare between two emerging magnetic fluxes (EMFs) observedwith IRIS and the Solar Dynamics Observatory (SDO) instruments. We proceed to aspatio-temporal analysis of IRIS spectra observed in the spectral ranges of MgII, C II, and Si IV ions. Doppler velocities from Mg II lines are computed byusing a cloud model technique. Strong asymmetric Mg II and C II line profileswith extended blue wings observed at the reconnection site (jet base) areinterpreted by the presence of two chromospheric temperature clouds, oneexplosive cloud with blueshifts at 290 km/s and one cloud with smallerDopplershift (around 36 km/s). Simultaneously at the same location (jet base),strong emission of several transition region lines (e.g. O IV and Si IV),emission of the Mg II triplet lines of the Balmer-continuum and absorption ofidentified chromospheric lines in Si IV broad profiles have been observed andanalysed. Such observations of IRIS line and continuum emissions allow us topropose a stratification model for the white-light mini flare atmosphere withmultiple layers of different temperatures along the line of sight, in areconnection current sheet. It is the first time that we could quantify thefast speed (possibly Alfv\'enic flows) of cool clouds ejected perpendicularlyto the jet direction by using the cloud model technique. We conjecture that theejected clouds come from plasma which was trapped between the two EMFs beforereconnection or be caused by chromospheric-temperature (cool) upflow materiallike in a surge, during reconnection

Multi thermal atmosphere of a mini solar flare during magnetic reconnection observed with IRIS