Reporte SILSO mes de Mayo

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# MONTHLY TABLE OF THE INTERNATIONAL TOTAL SUNSPOT NUMBER     #

# AND 12-MONTH PREDICTIONS from the World Data Center SILSO              #

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Provisional International monthly mean Sunspot Number for

May 2017 : 18.8

Maximum : 55 on 23 // Minimum : 0 on 9, 10, 13, 14, 15, 30, 31

Provisional daily International Sunspot Numbers for May 2017 :

1.. 12    6.. 27   11.. 11   16.. 25   21.. 36   26.. 25   31..  0

2.. 28    7.. 23   12.. 14   17.. 12   22.. 50   27.. 24

3.. 18    8.. 11   13..  0   18.. 24   23.. 55   28.. 21

4.. 17    9..  0   14..  0   19.. 24   24.. 20   29.. 14

5.. 31   10..  0   15..  0   20.. 30   25.. 31   30..  0

80 cooperating stations on June 1, 08 UT

Predictions of the monthly smoothed Sunspot Number using the last

provisional value, calculated for November 2016 :  29.9 (+-5%)

SM    CM                 SM    CM                        SM    CM

2016 Dec    30    27      2017 Jun    20    23     2017 Dec    15    30

2017 Jan    26    27      2017 Jul    20    25       2018 Jan    14    29

2017 Feb    24    25     2017 Aug    19    26     2018 Feb    13    28

2017 Mar    23    25     2017 Sep    18    27    2018 Mar    12    27

2017 Apr    22    24      2017 Oct    17    28     2018 Apr    10    23

2017 May    21    22      2017 Nov    16    29   2018 May     8    22

SM : SIDC classical method : based on an interpolation of Waldmeier’s

standard curves; the estimated error ranges from 7% (first month) to

35% (last month)

CM : Combined method : the combined method is a regression technique

coupling a dynamo-based estimator with Waldmeier’s idea of standard

curves, due to K. Denkmayr.

ref. : K. Denkmayr, P. Cugnon, 1997 : «About Sunspot Number Medium-Term

Predictions», in «Solar-Terrestrial Prediction Workshop V», eds.

1. Heckman et al., Hiraiso Solar Terrestrial Research Center, Japan, 103

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# World Data Center SILSO                                                                                  #

# Sunspot Index and Long-term Solar Observations                                      #

# Royal Observatory of Belgium                                                                          #

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# MONTHLY TABLE OF THE TOTAL AND HEMISPHERIC SUNSPOT NUMBERS         #

# from the World Data Center SILSO                                                                                  #

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MAY 2017

PROVISIONAL INTERNATIONAL NORMALIZED HEMISPHERIC SUNSPOT NUMBERS

Date             Sn           Sn(N)           Sn(S)

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1              12                0              12

2              28               17              11

3              18               18               0

4              17               17               0

5              31               31               0

6              27               27               0

7              23               23               0

8              11               11               0

9               0                  0               0

10               0                 0               0

11              11                0              11

12              14               14               0

13               0                  0               0

14               0                  0               0

15               0                  0               0

16              25               25               0

17              12               12               0

18              24               11              13

19              24               11              13

20              30               19              11

21              36               24              12

22              50               27              23

23              55               25              30

24              20              20               0

25              31                31               0

26              25               25               0

27              24               24               0

28              21               21               0

29              14               14               0

30               0                  0               0

31               0                  0               0

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MONTHLY MEAN :          18.8            14.4             4.4

COOPERATING STATIONS :   80              63              63

PILOT STATION : Specola Solare Ticinese, Locarno

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Reproduction permitted if source mentionned

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# World Data Center SILSO                                                                 #

# Sunspot Index and Long-term Solar Observations                     #

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