NRO Heliograph Tohban's Report for Week 26 (22 June 1998 - 28 June 1998)

                                               Tohban : K. Shibasaki

1. Solar Activity

   M1 class event was detected by the NRH on June 27 at AR8253.
   However, the 17 GHz correlation value reached only 160.

2.  Remarkable Events found by NRH

   Two prominence eruptions were observed.  The first occurred on June 21/22.
   When the observation started around 23 UT on June 21, large prominences were
   already existed both at NW and SE limbs.  They gradually collapsed 
   simultaneously.  The residuals of the collapse at the NW limb started rising
   motion and disappeared from the field of view in 2 hours.   LASCO image
   after 10 hours showes dense cloud.

   The other one occurred at SW limb on June 23, 02 UT - 04 UT.