NRO Heliograph Tohban's Report for Week 06 (1 Feb. 1999 - 7 Feb. 1999)

                                          Tohban : T. Yokoyama

1. Solar Activity

  The Sun was very quiet in the microwave range this week 
  in the sence of rise-and-fall of the signal amplitude.
  There was no event detected by NoRH.
  However, we observed a huge, nice prominence eruption on Feb 1, 1999.

2. Remarkable Events found by NoRH

 2.1 A huge prominece eruption on Feb 1, 1999

  The long filament sitting over the southern hemisphere erupted away.
  The untwisting helical structure of the erupting plasma threads 
  could be clearly seen. 
  Visit event 19990201_0100 at 
    http://solar.nro.nao.ac.jp/~tohban.

 2.1 A tiny prominece eruption on Feb 4, 1999

  A relatively tiny prominence eruption was seen on almost the same position
  of the 1999-2-1 event.

3. Observing log

  There was no trouble.

4. Next tohban (week 07)

  J. Sato