Diameters of the circles approximately represent the range of the lightning discharge electromagnetic forces. In addition to all that, however, the crop pattern occurs at least several days, sometimes up to several weeks after the lightning hit. It is because the affected plant tissues weaken very slowly, due to huge inertia and consequently very slowly ongoing changes in plants (EPP, Chronology).
Ni kwa sababu walioathirika kupanda tishu kudhoofisha polepole sana, kutokana na Inertia kubwa na hivyo polepole sana-kwenda mabadiliko ya mimea (electro-Phytopathology, chronology).