Time Variation of Hard X-Ray Image in the Early Phase of Solar Impulsive Bursts Takakura, T. ; Inda, M. ; Makishima, K. ; Masuda, S. ; Kosugi, T. ; Sakao, T. ; Sakurai, T. ; Ogawara, Y. Abstract Publication: X-ray solar physics from Yohkoh Pub Date: 1994 Bibcode: 1994xspy.conf...71T