Table 2 Relative 36Cl/10Be ratios.

From: Multiradionuclide evidence for the solar origin of the cosmic-ray events of AD 774/5 and 993/4

Solar proton event

Relative 36Cl/10Be ratio

1

23 February 1956

1.2

2

20 January 2005

1.5

 

AD 774/5

1.8±0.2

 

AD 993/4

2.1±0.4

3

29 September 1989

2.5

4

29 October 2003

3

5

14 July 2000

3.5

6

19 October 1989

3.6

7

10 July 1959

4

8

12 November 1960

4

9

04 August 1972

6

10

04 November 2001

6

  1. The ratios are based on computations of the annual mean production of 10Be and 36Cl by 10 large solar proton events between 1956 and 2005 (ref. 35). The ratios calculated in this study for the AD 774/5 and 993/4 events are also included. The table is sorted by ascending ratios.
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