Null-Point Oscillations of Chromospheric Large Cool Jets

摘要

In addition of the whip-like behavior, null-point motions in the reconnection site can excite transversal oscillation along the magnetic dense jets, which was called the kink mode wave, and also this mode can evolve into Alfven wave after its propagation into the more homogeneous medium. The study of X-ray jets is an important topic to understand the heating of the solar corona and the origin of the fast wind. The recently launched Hinode mission permitted to observe the cool proxies of these jets with an unprecedented high spatial resolution of 120 km on the Sun. We selected a high cadence sequence of SOT (Hinode) observations taken with both the HCaII and the Ha filter to look at the details of the dynamics revealed by a large jet event. Both wavelet and amplitude spectra analysis were used to analyze the observed kink wave and the time variations of intensities during the event. The results are discussed in the frame of different models implying reconnections with the inference of the dynamical phenomena occurring in the vicinity of several null points including the oscillatory behavior.