In the rigid body, the biggest whirl attracts with its underpressure (Bernoulli-force) more smaller whirls. Its rotational vector is parallel to that of the Sun. It functions similar to an elevation-balloon for sunk ships due to its strongest bouyancy force. The different streamings of the convective zone deflect this locomotive and train to horizontal position and the sunspot group comes into existence. The rotational vector of the leading sunspot points outwards on the northern hemisphere.
The book: "The Electric Universe" by Dr. László Körtvélyessy