Tilt angle variation through the 14TH sunspot cycle

The tilt angle variation of bipolar magnetic regions (BMRs) in space and time is a probable indicator of large-scale properties of magnetic field distribution, the dynamo process and different influences effected on rising flux tube. Such an investigations have been made in several cases but without distinction of markedly aligned sunspot groups to others. In cases of that kind a great number of long term datasets are required. We have a long-term series of photosphere drawings from 1880 to 1919 (Fenyi 1919). With the help of these daily observations the data of Greenwich Photo-Heliographic Results (GPI-IR) have been analysed to study the orientation angles of BMRs through the 14th sunspot cycle. We have investigated the tilt angle distribution and the variation of tilt angle as a function of latitude and time. Our work differs from any of the previous investigations to the studied sunspot cycle, data sets and applied evaluation procedure. Despite all this it has even confirmed the Coriolis force hypothesis.