This is a well-documented Solar anomaly.  The effect  can be loosely  described as  "  the spinning dinner plate  wobble."   This evidences  a  significant  dynamic  imbalance  attributable to  the  massive  deficiencies  in solar  core mass distribution,  which supports  the  'Solar Core  is jetting  twin jets' hypothesis.
 
The jets lie  on the Solar Equator and, as the solar core has  significant angular momentum,  the jets  generate  a  spiral jet eflux contrail of  core  material  and fuzing  plasma.   The  North  and   South Hemispherical  jet contrails   form   twin  identical,  "bedspring coil configured  spirals"  one in each hemisphere. 

The jets  exit  a core collapse zone  and,  as the  entire core  is  is in effect a Torus, each jet exits via  a jet  bore that  runs through the solar core.  The  bore represents, a deficiency  in  core materiel that is missing  from the torus.   A  jetting  torus would  normally generate  a  spiral in a single plane,  like the grooves  in a vinyl  grammophone record.    However,  the solar  cores  axis  of  rotation  is  7 degrees  to the  solar ecliptical  ( solar plane).    Instead of   generating  a flat spiral,   the jets  generate twin bedspring  configured spirals. 
The 7 degree  inclined axis of rotation  causes the  jet boreholes to  rise and fall and  this  generates  the equatorial disk wobble.