  We use observations of line-of-sight magnetograms from Helioseismic and
Magnetic Imager (HMI) on board of Solar Dynamics Observatory (SDO) to
investigate polarity separation, magnetic flux, flux emergence rate, twist and
tilt of solar emerging active regions. Functional dependence of polarity
separation and maximum magnetic flux of an active region is in agreement with a
simple model of flux emergence as the result of buoyancy forces. Our
investigation did not reveal any strong dependence of emergence rate on twist
properties of active regions.
