title: Daylight time-resolved photographs of lightning.
abstract: Lightning dart leaders and return strokes have been recorded in daylight with both good spatial resolution and good time resolution as part of the Thunder-storm Research International Program. The resulting time-resolved photographs are apparently equivalent to the best data obtained earlier only at night. Average two-dimensional return stroke velocities in four subsequent strokes between the ground and a height of 1400 meters were approximately 1.3 x 10(8) meters per second. The estimated systematic error is 10 to 15 percent.
authors.forename: R E
authors.initials: RE
authors.lastname: Qrville
authors.forename: G G
authors.initials: GG
authors.lastname: Lala
authors.forename: V P
authors.initials: VP
authors.lastname: Idone