Onset voltage of positive glo corona i rod-plane gaps as influenced by temperature

The postulate put for ard by Hermstei to account for the positive glo corona as idely accepted at first and later criticised. Loeb´s alternative postulate has not been fully satisfactory. I this paper, a method is described for calculating the onset voltage of positive glo corona i rod-plane gaps i air at room and high temperatures. The method has a flavour of both the Hermstei and Loeb postulates, but is based o the physics of air discharges occurring i the ionisatio zone around the stressed rod. The threshold voltage of onset streamers and their development at higher voltages are prerequisites for calculating the onset voltage of positive glo . The threshold and onset voltages increase ith the gap spacing at room temperature and decrease ith the increase of air temperature for the same gap geometry i conformity ith previous findings. The calculated threshold voltage and repetitio rate of onset streamers, i additio to the