Solar Washing Machine Results Discussion - Part 1

name

  1. Coupled Alfvén and Kink Oscillations in Coronal Loops:Pascoe 2010
  2. Propagating Wave Phenomena Detected in Observations and Simulations of the Lower Solar Atmosphere:Jess 2012
  3. Proper Orthogonal and Dynamic Mode Decomposition of Sunspot Data:Albidah 2020
  4. Phase relations for seismology of photospheric flux tubes: Moreels 2013
  5. Oscillations and Waves in Sunspots: Khomenko 2015

We want to measure the phase difference between oscillations of Bz. and vz i.e. the vertical component of the B field and the plasma velocity respectively. With the recent series of models this was challenging for the following reasons:

  • One of the drivers had multiple frequencies
  • Driver had a damping factor
  • The first model run uni1 did not have a damping factor but the amplitude was too low

In all cases the distance time plots demonstrate that the cycles start after a quarter of a period i.e after 45s.

The movies illustrate that the combination of two mutually perpendicular linear kink drivers wich are out of phase by a quarter of a cycle results in the appearance of a circular oscillation.

For case 1 (uni1) - we observe an undamped periodic cycle with the same frequency as the driver - after an initial increase the maximum amplitude of the vertical velocity component has a fixed maximum amplitude

For case 2 and 3 (uni2 and uni3) - the amplitude of oscillations rises to a maximum and then decays away, a period consistent with that of the driver is superimposed on the signal.

For case 4 (uni 4) - the amplitude of oscillations rises to a maximum and then decays away, a period consistent with that of the driver is superimposed on the signal.Since the driver is a superposition of three frequencies we can see evidence of these in the signal.