抄録
Lightning discharges which do not reach the ground have been divided into three types: (1) from the negative charge centre to air, (2) from the negative charge centre to the lower positive charge, (3) from the negative charge centre in a horizontal direction inside the cloud. No evidence of a vertical discharge to the upper part of the cloud was observed. (1) and (3) are similar in many respects electrostatic field change, optical radiation, low frequency variations) but the 14MHz radiation is different, (3) being quite different from others. Complex electrostatic field changes were recorded for the three types.
