NRO Heliograph Tohban's Report for Week 18 (26 Apr. 1999 - 2 May 1999) Tohban : T. Yokoyama 1. Solar Activity The Sun was quiet. Several One M-class and several C-class flares occured. NoRH observed the C4.2 one on Apr 30. 2. Remarkable Events found by NRH an short-lived weak flare on April 30. This event is briefly reported in NoRH home page, http://solar.nro.nao.ac.jp/~tohban/events.html. 3. Observing log ### 99/04/27 Due to the system trouble, no data were obtained from antennas W01 - W14. 4. Next tohban (week 19) J. Sato +--End of Report--