Electromagnetic field mode in fireball formation

Abstract

It is generally known that ball lightnings exist in nature. Ohtsuki and Ofuruton (1991, 1994) were successful in producing plasma fireballs like ball lightnings in laboratory by using microwave interference in a cavity. According to Kapitza's (1955) theory, ball lightnings appear at high intensity regions of electromagnetic wave interference. However, the experimental fireballs produced by Ohtsuki and Ofuruton were able to appear at regions where electromagnetic field of high intensity did not exist theoretically. A new method in measuring the electromagnetic field mode by using thermal paper was used and a possibility that electromagnetic fields became high around fireballs was made sure.

一般に、球雷は自然界に存在することが知られている。OhtsukiとOfuruton(1991、1994)は研究室内で空胴内のマイクロ波干渉を用いて球雷のようなプラズマ火の玉の生成に成功した。Kapitza(1955)の理論によれば、球雷は電磁波干渉の高強度領域に出現するが、OhtsukiおよびOfurutonによって実験的に生成された火の玉は、高強度の電磁場が理論的に存在しない領域で出現できた。感熱紙を用いて電磁場モードを測定する新しい方法により、電磁場が火の玉の周辺で高くなるという可能性を確認した。