Nobeyama Radioheliograph Tohban's Report for Week 17 (17 - 23 Apr 2000) Tohban : H. Nakajima 1. Solar Activity There were many active regions on the solar disk. Most of them show some activities, however, they are rather weak. 2. Remarkable Events found by NoRH ------------------------------------------------------------------------- DAY Start Peak End Dur Max Cor. Note (UT) (UT) (UT) (sec) (x 10^-4) ------------------------------------------------------------------------- 2000-04-17 00:28:28 00:28:34 00:34:29 361 8 / 2000-04-17 01:10:09 01:11:39 01:13:04 175 10 / 2000-04-17 06:00:22 06:00:29 06:01:48 86 8 / 2000-04-17 06:03:01 06:03:02 06:03:30 29 7 / 2000-04-17 22:45:58 22:46:06 22:48:21 143 6 / 2000-04-17 22:51:17 22:56:52 23:09:56 1119 7 / 2000-04-18 05:44:09 05:44:51 05:51:19 430 7 / 2000-04-18 05:53:46 05:54:22 05:59:29 343 6 / 2000-04-18 06:05:52 06:25:18 06:44:57 2345 10 / 2000-04-18 23:03:25 23:03:40 23:06:50 205 7 / 2000-04-19 02:01:31 02:01:53 02:07:52 381 39 / 2000-04-19 03:28:14 03:29:00 03:32:42 268 7 / 2000-04-19 03:38:50 03:44:43 05:10:11 5481 11 / 2000-04-19 05:43:57 05:46:45 06:44:57 3660 39 / 2000-04-19 22:58:13 22:58:38 23:12:17 844 85 / 2000-04-20 01:49:43 01:50:20 01:51:01 78 27 / 2000-04-20 04:22:41 05:56:06 06:44:58 8537 43 / 2000-04-21 02:36:02 02:36:19 02:37:15 73 72 / 2000-04-21 03:25:10 03:25:22 03:25:47 37 42 / 2000-04-21 05:48:40 06:11:19 06:45:00 3380 29 / 2000-04-22 01:45:36 01:45:37 01:45:43 7 27 / 2000-04-22 04:57:06 06:41:26 06:44:57 6471 32 / ------------------------------------------------------------------------ (http://solar.nro.nao.ac.jp/~tohban/event/) 3. Observing log The antenna, N21, did not point to the Sun on April 23, 2000. 4. Next tohban (week 18) Y. Hanaoka