Kitsunebi (狐火) is an atmospheric ghost light told about in legends all across Japan outside Okinawa Prefecture. They are also called "hitobosu", "hitomoshi" (火点し), and "rinka" (燐火).
The Bakemono Tsukushi Emaki, author unknown (late Edo period)
"Kitsunebi" from the Gazu Hyakki Yagyō by Toriyama Sekien
"Kitsunebi on New Year's Night under the Enoki Tree near Ōji" in the One Hundred Famous Views of Edo by Hiroshige. Each fox has a kitsunebi floating close to their face.
Kitsune no Gyoretsu(Ōji 2010)
Atmospheric ghost lights are lights that appear in the atmosphere without an obvious cause. Examples include the onibi, hitodama and will-o'-wisp. They are often seen in humid climates.
Sayō Shunsō Anzekyū Ika wo Mishi Mono from Nishihari Kaidan Jikki
Jōsenbi from Ehon Sayo Shigure by Shungyōsai Hayami