The First Joint Observation of EUV Jets and spicules with BBSO/GST and Solar Orbiter

We study tiny EUV jets jointly observed by the Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter and the high-resolution H-alpha images from the Visible Imaging Spectrometer (VIS) installed on the 1.6 m Goode Solar Telescope (GST) at the Big Bear Solar Observatory (BBSO). The EUV jets repeatedly occurred on 2022-10-29 around 19:10 UT in a quiet sun region (201E, 356N). SDO and IRIS data are used to connect the GST images with the EUI images. A general agreement between the direction of the EUI jets and the alignment of the VIS spicules probably indicates the local magnetic structure. However, the EUI jets show an evolving helical structure, while the H-alpha spicules retain the linear shape. An obvious H-alpha counterpart to the EUI jets is the appearance of red shift concentrated under the EUI jets, while blue shift dominates elsewhere. We use the thin flux tube model to suggest that the morphology of the transient coronal brightening is a manifestation of Alfven wavefronts generated as a result of exchange reconnection, and the red-shifted H-alpha line structure is a downward reconnection outflow from the coronal X-point. The detection of such a sophisticated coronal evolution decoupled from chromospheric dynamics is made possible by the Solar Orbiter's high resolution and a distinctive viewing angle, furthering its goal of understanding how the Sun generates small-scale ejections in the chromosphere and corona.