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

Non-equilibrium ionization (NEI) is essentially required for astrophysicalplasma diagnostics once the plasma status departs from ionization equilibriumassumptions. In this work, we perform fast NEI calculations combined withmagnetohydrodynamic (MHD) simulations and analyze the ionization properties ofa Petschek-type magnetic reconnection current sheet during solar eruptions. Oursimulation reveals Petschek-type slow-mode shocks in the classical Spitzerthermal conduction models and conduction flux-limitation situations. Theresults show that under-ionized features can be commonly found in shockedreconnection outflows and thermal halo regions outside the shocks. Thedeparture from equilibrium ionization strongly depends on plasma density. Inaddition, this departure is sensitive to the observable target temperature: thehigh-temperature iron ions are strongly affected by NEI effects. Theunder-ionization also affects the synthetic SDO/AIA intensities, whichindicates that the reconstructed hot reconnection current sheet structure maybe significantly under-estimated either for temperature or apparent width. Wealso perform the MHD-NEI analysis on the reconnection current sheet in theclassical solar flare geometry. Finally, we show the potential reversal betweenthe under-ionized and over-ionized state at the lower tip of reconnectioncurrent sheets where the downward outflow collides with closed magnetic loops,which can strongly affect multiple SDO/AIA band ratios along the reconnectioncurrent sheet.

Non-equilibrium Ionization Modeling of Petschek-type Shocks in Reconnecting Current Sheets in Solar Eruptions