NRO Heliograph Tohban's Report for Week 45 (2 Nov. 1998 - 8 Nov. 1998) Tohban : K. Shibasaki 1. Solar Activity Solar activity was high due to the increased activity of NOAA 8375 (N18, LO 183, BETA-GAMMA) since Nov. 3. Six M-class flares were recorded by GOES, however, all of them occurred during the night. Many C-class events were recorded by the Nobeyama Radioheliograph. Due to its large size of the active region, a large (post) flare loop with a compact bright sunspot associated source at its end were visible in radio. NRH event list of week 45 -------------------------------------------------------------- DAY START END MAX.TIME DUR. Max | GOES (UT) (UT) (UT) (sec) Cor. | class -------------------------------------------------------------- 98/11/04 23:42:32 23:48:39 23:43:28 367 98 ---- 98/11/05 00:24:50 00:27:33 00:25:59 163 144 ---- 98/11/05 00:35:31 00:50:38 00:37:55 907 52 ---- 98/11/05 00:51:00 00:51:05 00:51:03 5 80 ---- 98/11/05 00:51:14 00:51:30 00:51:18 16 204 ---- 98/11/05 00:59:01 02:19:24 01:07:41 4823 130 C7.1 98/11/05 02:25:03 02:47:15 02:25:44 1332 48 ---- 98/11/05 02:59:05 03:00:04 02:59:09 59 60 C5.4 98/11/05 03:02:08 03:06:02 03:03:16 234 127 C5.4 98/11/05 04:58:28 05:05:24 05:00:01 416 72 C7.7 98/11/05 06:14:32 06:15:41 06:14:46 69 523 C2.7 98/11/05 22:45:22# 00:00:04 22:45:23 4482 73 ---- 98/11/06 02:41:27 02:54:05 02:42:11 758 239 C4.4 98/11/06 04:35:25 06:44:57# 06:31:25 7772 51 C1.1 98/11/06 23:34:12 23:47:07 23:36:23 775 54 ---- 98/11/07 01:11:01 01:11:02 01:11:02 1 26 ---- 98/11/07 01:11:04 01:11:05 01:11:05 1 25 ---- 98/11/07 01:11:07 01:11:13 01:11:09 6 107 ---- 98/11/07 05:45:14 05:45:33 05:45:15 19 42 C1.3 98/11/07 05:47:14 05:48:45 05:47:17 91 62 C1.3 98/11/07 22:47:12 23:36:48 22:52:40 2976 43 ---- 98/11/07 23:41:22 23:43:52 23:41:27 150 100 ---- 98/11/07 23:58:07 23:58:28 23:58:10 21 50 ---- 98/11/08 02:17:02 02:18:38 02:17:34 96 51 ---- 98/11/08 04:25:10 04:26:54 04:25:50 104 124 C6.9 98/11/08 04:37:54 04:52:04 04:43:31 850 54 C6.9 2. Remarkable Events found by NRH A gradual flare with many spikes in NOAA 8375 started at 23:42 on Nov. 4. The duration was more than 3 hours. Patchy structure in the early phase evolved into a long loop (or arcade) + one bright patch (sunspot associated). 160 min. after the beginning of the event, two far away active regions were activated successively (1 hour apart). If we assume that these activations were caused by a disturbance initiated by the flare in NOAA 8375, the propagation speeds along the surface were 65.9 km/s and 65.7 km/s respectively. 3. Observing log None 4. Next tohban (week 46) T. Yokoyama