NRO Heliograph Tohban's Report for Week 34 (16 August 1999 - 22 August 1999)

                                                    Tohban : H. Nakajima

1. Solar Activity

Solar activity was rather high in this week.  NORH observed an intense
(M9.8) flare, while most of the remainings are B and C classes. 

  NoRH event list of week 34
----------------------------------------------------------------
   DAY       START        END     MAX.TIME   DUR.  MaxCor | GOES  
              (UT)        (UT)      (UT)    (sec)  (10^-4)| class  

1999-08-16 22:30:21  22:30:49  01:16:21   9960         13 /                 
1999-08-17 03:33:57  03:34:29  03:35:00     63          8 / B9.5            
1999-08-17 06:17:30  06:17:36  06:19:15    105          7 /                 
1999-08-17 06:19:58  06:27:59  06:30:21    623          7 /                 
1999-08-18 02:10:06  02:10:07  02:12:00    114          7 /                 
1999-08-18 06:25:27  06:30:54  06:53:03   1656         13 / C3.0            
1999-08-18 22:53:38  22:53:47  22:59:54    376          7 /                 
1999-08-19 01:06:39  01:07:52  01:11:15    276          7 /                 
1999-08-20 03:15:12  03:15:24  03:16:02     50          8 /                 
1999-08-20 03:27:29  03:27:35  03:28:27     58         23 /                 
1999-08-20 22:30:24  23:06:09  00:16:35   6371       3379 / M9.8            
1999-08-21 01:03:59  01:04:20  01:04:44     45          7 /                 
1999-08-21 01:31:26  01:31:32  01:31:44     18         22 /                 
1999-08-21 01:57:05  01:57:07  01:57:23     18          8 / C3.7            
1999-08-21 02:01:38  02:01:45  02:02:11     33          7 / C3.7            
1999-08-21 04:55:24  04:55:40  04:57:52    148         12 /                 
1999-08-21 04:59:44  04:59:48  05:00:11     27          8 /                 
1999-08-21 05:59:15  06:03:20  06:11:40    745          7 /                 
1999-08-21 06:15:31  06:22:58  06:30:24    893          8 /                 
1999-08-21 22:30:23  23:06:15  23:24:50   3267         12 /           
----------------------------------------------------------------


2. Remarkable Events found by NRH

We observed an intese microwave flare (M9.8) and a large prominence 
eruption this week. The backward-S shaped sigmoid in AR 8668 is a 
target of Max Millennium Observing Plan. For this region, we observed 
an interesting microwave activity which travels along the sigmoid. 

(1) A weak activity was observed to travel along the sigmoid on August 
16. The bright, stationary microwave source was located around the 
southern part of the sigmoid. The weak activity propagated toward the 
north from this source.

(2) A large prominence eruption was observed at the south-east limb 
from 04:53 UT to 06:55 UT on August 17 at the south-east limb.  
A splended CME was also reported by SOHO/LASCO.

(3) An intense microwave flare (GOES M9.8) was observed in AR8674 
(S24S64) from 22:30 UT to 23:06 UT on August 20. This flare is short 
in duration and cmpact in structure with some extension toward higher 
corona.
  
3. Observing log

An instrumental test was carried out on August 19.  Due to this test,
the E27 and E28 antennas ware not used for the observation during 
01:45 - 03:30 UT.

4. Next tohban

  K. Hori

+--End of Report--