IDL> .r nnmed_maxdate % Compiled module: $MAIN$. 21 41 60 73 83 100 110 125 151 175 206 218 242 267 289 310 337 360 382 403 419 449 472 493 516 531 554 634 658 683 705 728 752 776 799 823 847 ---- peak time ------- Carr.rot.of CM --- delta day --- 2017/01/25 06:19:12 164.08899 22.487442 2017/02/16 18:01:07 228.00145 21.039988 2017/03/09 18:58:42 310.86001 14.958970 2017/03/24 17:59:37 113.67492 9.9749884 2017/04/03 17:23:36 342.09850 19.022234 2017/04/22 17:55:37 90.962830 12.009051 2017/05/04 18:08:39 292.26932 17.055521 2017/05/21 19:28:36 66.720613 27.892384 2017/06/18 16:53:38 57.589878 26.030914 2017/07/14 17:38:09 73.052715 38.052778 2017/08/21 18:54:09 289.82188 14.459363 2017/09/05 05:55:38 98.799496 26.503137 2017/10/01 18:00:09 108.93186 27.009444 2017/10/28 18:13:45 112.64966 27.008669 2017/11/24 18:26:14 116.57340 25.133287 2017/12/19 21:38:10 145.38886 28.851030 2018/01/17 18:03:39 125.41596 24.999988 2018/02/11 18:03:38 156.25156 26.090694 2018/03/09 20:14:14 172.60552 25.964884 2018/04/04 19:23:40 190.24478 18.152488 2018/04/22 23:03:15 310.58595 33.243345 2018/05/26 04:53:40 231.05857 30.549977 2018/06/25 18:05:38 186.72204 26.998681 2018/07/22 18:03:44 189.41647 27.497546 2018/08/19 06:00:12 185.80282 18.508993 2018/09/06 18:13:09 301.27308 27.047604 2018/10/03 19:21:42 304.23590 88.042326 2018/12/30 20:22:39 223.61967 25.907650 2019/01/25 18:09:40 242.46085 26.992350 2019/02/21 17:58:39 247.04841 27.012153 2019/03/20 18:16:09 251.14210 25.989583 2019/04/15 18:01:09 268.24913 26.019109 2019/05/11 18:28:40 284.43386 25.990637 2019/06/06 18:15:11 300.57823 26.990625 2019/07/03 18:01:41 303.31932 26.010382 2019/07/29 18:16:38 319.14813 25.988935 2019/08/24 18:00:42 335.56264 -941.48715 [note added on 10-nov-2021] 1) when the Sun's activity is low (after Apr-2018), the peaks are due to a single AR passing repeatedly accross the disk. 2) when the Sun's activity is high, peaks sometimes occur the remnant of a large AR coming close to the DC. Although the X-ray is not so bright, the temperature there is still higher than the surroundings and enough for creating the peak.