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

Spicules were recently found to exist as two types when a new class ofso-called type II spicules was discovered at the solar limb with Hinode. Thetype II spicules have been linked with on-disk observations of RapidBlue-shifted Excursions (RBEs) in the Ha and Ca 8542 lines. Here we analyzeobservations optimized for the detection of RBEs in both Ha and Ca 8542simultaneously at a high temporal cadence taken with CRISP at the SST. Thisstudy used a high-quality time sequence for RBEs at different blue-shifts andemployed an automated detection routine to detect a large number of RBEs inorder to expand on the statistics of RBEs. We find that the number of detectedRBEs is dependent on the Doppler velocity of the images on which the search isperformed. Detection of RBEs at lower velocities increases the estimated numberof RBEs to the same order of magnitude expected from limb spicules. This showsthat RBEs and type II spicules are exponents of the same phenomenon. We provideevidence that Ca 8542 RBEs are connected to Ha RBEs and are located closer tothe network regions with the Ha RBEs being the continuation, and show that RBEshave an average lifetime of 83.9 s when observed in both spectral lines withDoppler velocity ranges of 10-25 km/s in Ca 8542 and 30-50 km/s in Ha. Inaddition, we determine the transverse motion of a much larger sample of RBEsthan previous studies and find that like type II spicules, RBEs undergosignificant transverse motions, 5-10 km/s. Finally, we find that theintergranular jets discovered in BBSO are a subset of RBEs.

Statistical properties of the Disk Counterparts of Type II Spicules from simultaneous observations of RBEs in Ca II 8542 and H{\alpha}