Speaker
Ainar Drews
(Institute of Theoretical Astrophysics, University of Oslo)
Description
Penumbral micro-jets (PMJs) are small-scale, dynamic objects found in the
chromosphere of the penumbra in sunspots, and are presumably caused by magnetic
reconnection. They were first observed in the chromospheric CaII H-line with
Hinode. Our work presently focuses on detections of PMJs in high resolution
observations in the CaII 8542 Å-line, obtained from the CRISP instrument at the
Swedish 1-meter Solar Telescope. We have developed an automatic detection method
that consists of a pipeline including data reduction using Principal Component
Analysis (PCA), object detection using the simple machine-learning K-Nearest
Neighbour (kNN) algorithm and subsequent object-tracking. This produces a large set
of observed objects of about 500 detections tracked through time, yielding base
statistics as well as a characteristic spectral profile for this class of objects.
We also report on numerical experiments employing the Radyn hydrodynamics code,
investigating the origin of PMJs.
Primary author
Ainar Drews
(Institute of Theoretical Astrophysics, University of Oslo)
