NOAA SPACE ENVIRONMENT SERVICES CENTER
Solar Proton Events Affecting the Earth Environment

Preliminary Listing

1976 - present

A current listing can be found at:
ftp://ftp.swpc.noaa.gov/pub/indices/SPE.txt

PARTICLE EVENT ASSOCIATED CME, FLARE, AND ACTIVE REGION
Start
(Day/UT)		Maximum
(Day/UT) 		Proton Flux
(pfu @
>10 MeV) 		YearCMEMaximum
(Day/UT)		Importance
(X ray/Opt) 		LocationNOAA SEC
Region No.
1976
Apr 30/2120May 01/1700 12Apr 30/2114X2/2B S09W47 700
1977
Sep 19/1430Sep 19/2130 200Sep 19/1054X2/3B N08W58 889
Nov 22/1400Nov 22/1800 160Nov 22/1006X1/2N N24W38 939
1978
Feb 13/0930Feb 14/1000 850Feb 13/0255M7/0B N22W131001
Apr 11/1530Apr 11/1630 65Apr 11/1353X2/2B N19W541057
Apr 29/0445Apr 30/2000 1,000Apr 28/1306X5/4B N22E411092
May 07/0420May 07/0420 100May 07/0330X2/2B N22W641095
Jun 02/0730Jun 02/0935 19May 31/1009M5/2B N23W501129
Jun 24/0900Jun 25/0230 25Jun 22/1709M2/3B N19E181164
Jul 13/0300Jul 13/1000 20
Sep 23/1035Sep 24/0400 2,200 Sep 23/1023X1/3BN35W501294
Nov 10/2130Nov 10/2140 38 Nov 10/0042M1/2NN17E021385
1979
Feb 17/2020Feb 17/2205 31 Feb 16/0200X2/2BN15E481574
Apr 03/1600Apr 03/2310 45
Jun 06/1850Jun 07/0005 950 Jun 05/0529X2/1NN20E161781
Jul 07/0015Jul 07/1010 50
Aug 19/0850Aug 21/0740 500 Aug 18/1416X6/1BN10E901943
Sep 15/1500Sep 16/1200 60 Sep 14/0802X2/ N10E901994
Nov 16/0430Nov 16/1300 75 Nov 15/1639M1/0B N34W22110
1980
Feb 06/1340Feb 06/1850 12
Jul 17/2300Jul 19/1930 100 Jul 17/0603M3/1B S12E02562
1981
Mar 30/0900Mar 30/2115 30 Mar 30/0049M3/2N N13W72993
Apr 10/1745Apr 11/1400 50 Apr 10/1655X2/3B N09W43025
Apr 24/1515Apr 24/2330 160 Apr 24/1400X5/2B N18W53049
May 09/1200May 10/2130 150 May 08/2252M7/2B N09E33099
May 15/0300May 16/1950 130 May 13/0425X1/3B N11E53106
Jul 20/1430Jul 20/1825 100 Jul 20/1329M5/1B S26W73204
Jul 25/0600Jul 25/1320 18
Aug 10/0115Aug/10 0435 57 Aug 07/1916M4/2B S10E23257
Oct 08/1235Oct 13/2247 2,000 Oct 07/2308X3/1B S19E83390
Dec 10/0545Dec 11/0900 65 Dec 09/1854M5/3B N12W13496
1982
Jan 31/0055Jan 31/1630 830 Jan 30/2358X1/3B S13E13576
Jun 06/0245Jun 06/0245 10 Jun 03/1146X8/2B S09E73763
Jun 09/0040Jun 09/0510 30 Jun 06/167X12/3 S11E3763
Jul 11/0700Jul 13/1615 2,900 Jul 09/0742X9/3B N17E73804
Jul 22/2030Jul 23/0220 240 Jul 22/1734M4/0F N29W83804
Sep 05/2205Sep 06/0100 66 Sep 04/0400M4/3N N11E33886
Nov 22/1940Nov 22/2140 40 Nov 22/1828M7/1N S11W43994
Nov 26/0605Nov 26/1500 25 Nov 26/0253X4/2B S11W83994
Dec 08/0010Dec 08/1000 1,000 Dec 07/2354X2/0B S14W84007
Dec 17/1845Dec 18/0945 130 Dec 15/0202X12/2 S10E4026
Dec 19/1920Dec 20/0515 85 Dec 19/1624M9/2B N10W74022
Dec 27/0600Dec 27/1345 190 Dec 25/0752X2/1B S14E34033
1983
Feb 03/1200Feb 04/1620 340 Feb 03/0619X4/3B S19W04077
Jun 15/0435Jun 15/1800 18 Jun 14/??????/??S09W904201
1984
Feb 16/0915Feb 16/1005 660 Feb 16??/??S12W904408
Feb 19/1310Feb 21/1415 55 Feb 17/2301 X2/2BN16E824421
Mar 13/1440Mar 13/1450 10
Mar 14/0405Mar 14/0505 100 Mar 14/0334 M2/2BS12W424433
Apr 25/1330Apr 26/1420 2,500 Apr 25/0005 X13/3BS12E434474
May 24/1045May 24/1140 31 May 22/1503 M6/2BS09E244492
May 31/1315May 31/1415 15 May 31/1142 M1/??S09W904492
1985
Jan 22/0415Jan 22/0550 14 Jan 21/2350 X4/2BS08W384617
Apr 25/1430Apr 26/0600 160 Apr 24/0935 X1/3BN06E274647
Jul 09/0235Jul 09/0325 140 Jul 09/0204 M2/1BS16W364671
1986
Feb 06/0925Feb 07/1730 130 Feb 06/0625 X1/3BS04W064711
Feb 14/1155Feb 15/0400 130 Feb 14/0929 M6/1BN01W764713
Mar 06/1835Mar 06/1930 21 Mar 06/1703 C4/1FN02E014717
May 04/1255May 04/1320 16 May 04/1007 M1/??N06W904717
1987
Nov 08/0200Nov 08/0940 120 Nov 07/2014 M1/?? N31W904875
1988
Jan 02/2325Jan 03/0835 92 Jan 02/2145 X1/3BS34W184912
Mar 25/2225Mar 25/2330 58 Mar 25/2145 EPL N22W904965
Jun 30/1055Jun 30/1140 21 Jun 30/0906 M9/2BS16E225060
Aug 26/0000Aug 26/0045 42 Aug 23/1804 M2/EPLN24E905125
Oct 12/0920Oct 12/0930 12 Oct 12/0511 X2/2NS20W665175
Nov 08/2225Nov 09/0635 13 Nov 07/1105 M3/1NS17W475212
Nov 14/0130Nov 14/0235 13 Nov 13/2309 M3/1NS23W275227
Dec 17/0610Dec 17/0855 18 Dec 15/0505 X1/1NN27E595278
Dec 17/2000Dec 18/0150 29 Dec 16/0841 X4/1BN26E375278
1989
Jan 04/2305Jan 05/0130 28 Jan 04/1753 M4/1NS20W605303
Mar 08/1735Mar 13/0645 3,500 Mar 06/1405 X15/3BN35E695395
Mar 17/1855Mar 18/0920 2,000 Mar 17/1744 X6/2BN33W605395
Mar 23/2040Mar 24/0110 53 Mar 23/1948 X1/3BN18W285409
Apr 11/1435Apr 12/0125 450 Apr 09/0105 X3/4BN35E295441
May 05/0905May 05/1000 27 May 04/1115 M5/2NS20W365464
May 06/0235May 06/1045 110 May 05/0737 X2/3BN30E015470
May 23/1135May 23/1350 68
May 24/0730May 24/0905 15 May 22/0037 M5/2BS21E165497
Jun 18/1650Jun 18/1910 18 Jun 18/1447 C4/0FN12W315534
Jun 30/0655Jun 30/0710 17 Jun 29/2127 M3/2BN26W605555
Jul 01/0655Jul 01/0720 17
Jul 25/0900Jul 25/1225 54 Jul 25/0844 X2/2NN25W845603
Aug 12/1600Aug 13/0710 9,200 Aug 12/1427 X2/2BS16W375629
Sep 04/0120Sep 04/0510 44 Sep 03/1432 X1/1BS18E165669
Sep 12/1935Sep 13/0825 57 Sep 12/0814 M5/EPLS18W795669
Sep 29/1205Sep 30/0210 4,500 Sep 29/1133 X9/EPLS26W905698
Oct 06/0050Oct 06/0825 22
Oct 19/1305Oct 20/1600 40,000 Oct 19/1258 X13/4BS27E105747
Nov 09/0240Nov 09/0610 43
Nov 15/0735Nov 15/0910 71 Nov 15/0659 X3/3BN11W265786
Nov 27/2000Nov 28/1105 380 Nov 25/2355 X1/2NN30E055800
Nov 30/1345Dec 01/1340 7,300 Nov 30/1229 X2/3BN26W595800
1990
Mar 19/0705Mar 19/2315 950 Mar 19/0508 X1/2BN31W435969
Mar 29/0915Mar 29/1005 16 Mar 28/0751 M4/2NS04W375988
Apr 07/2240Apr 08/1330 18 Apr 04/1338 M7/0NN22E726007
Apr 11/2120Apr 11/2130 13
Apr 17/0500Apr 17/0655 12 Apr 15/0302 X1/2BN32E396022
Apr 28/1005Apr 28/1735 150
May 21/2355May 22/0750 410 May 21/2219 X5/2BN35W366063
May 24/2125May 25/0115 180 May 24/2051 X9/1BN33W786063
May 28/0715May 29/0100 45
Jun 12/1140Jun 12/1700 79 Jun 12/0541 M6/2BN10W336089
Jul 26/1720Jul 26/2315 21
Aug 01/0000Aug 01/2015 230 Jul 30/0736 M4/2BN20E456180
1991
Jan 31/1130Jan 31/1620 240 Jan 31/0230 X1/2BS17W356469
Feb 25/1210Feb 25/1305 13 Feb 25/0819 X1/2NS16W806497
Mar 23/0820Mar 24/0350 43,000 Mar 22/2247 X9/3BS26E286555
Mar 29/2120Mar 30/0330 20
Apr 03/0815Apr 04/1000 52 Apr 02/2327 M6/3BN14W006562
May 13/0300May 13/0910 350 May 13/0144 M8 S09W906615
May 31/1225Jun 01/0445 22
Jun 04/0820Jun 11/1420 3,000 Jun 04/0352 X12/3BN30E706659
Jun 14/2340Jun 15/1950 1,400 Jun 15/0821 X12/3BN33W696659
Jun 30/0755Jul 02/1010 110 Jun 28/0626 M6 N30E856703
Jul 07/0455Jul 08/1645 2,300 Jul 07/0223 X1/2BN26E036703
Jul 11/0240Jul 11/0450 30 Jul 10/1228 M3/2NS22E346718
Jul 11/2255Jul 12/0205 14
Aug 26/1740Aug 27/1830 240 Aug 25/0115 X2/2BN25E646805
Oct 01/1740Oct 01/1810 12 Sep 29/1533 M7/4BS21E326853
Oct 28/1300Oct 28/1440 40 Oct 27/0548 X6/3BS13E156891
Oct 30/0745Oct 30/0810 94 Oct 30/0634 X2/3BS08W256891
1992
Feb 07/0645Feb 07/1115 78 Feb 06/1048 M4/2BS13W107042
Mar 16/0840Mar 16/0840 10 Mar 15/0154 M7/3BS14E297100
May 09/1005May 09/2100 4,600 May 08/1546 M7/4BS26E087154
Jun 25/2045Jun 26/0610 390 Jun 25/2014 X3/2BN09W677205
Aug 06/1145Aug 06/1210 14 Aug 03/0706 M4/1NS09E687248
Oct 30/1920Oct 31/0710 2,700 Oct 30/1816 X1/2BS22W617321
1993
Mar 04/1505Mar 04/1735 17 Mar 04/1240 C8/2NS14W567434
Mar 12/2010Mar 13/0155 44 Mar 12/1815 M7/3BS00W517440
1994
Feb 20/0300Feb 21/0900 10,000 Feb 20/0141 M4/3BN09W027671
Oct 20/0030Oct 20/0340 35 Oct 19/2127 M3/1FN12W247790
1995
Oct 20/0825Oct 20/1210 63 Oct 20/0607 M1/0FS09W557912
1996
None
1997
Nov 04/0830Nov 04/1120 72 W/04 0610 Nov 04/0558 X2/2BS14W338100
Nov 06/1305Nov 07/0255 490 W/06 >1300 Nov 06/1155 X9/2BS18W638100
1998
Apr 20/1400Apr 21/1205 1,700 W/20 1007 Apr 20/1021 M1/EPLS43W908194
May 02/1420May 02/1650 150 Halo/02 1406 May 02/1342 X1/3BS15W158210
May 06/0845May 06/0945 210 W/06 0829 May 06/0809 X2/1NS11W658210
Aug 24/2355Aug 26/1055 670 NA Aug 24/2212 X1/3BN30E078307
Sep 25/0010Sep 25/0130 44 NA Sep 23/0713 M7/3BN18E098340
Sep 30/1520Oct 01/0025 1,200 NA Sep 30/1350 M2/2NN23W818340
Nov 08/0245Nov 08/0300 11 ? none
Nov 14/0810Nov 14/1240 310 NA Nov 14/0518 C1/BSLN28W908375?
1999
Jan 23/1105Jan 23/1135 14 NA Jan 20/2005 M5N27E90?
Apr 24/1804Apr 25/0055 32 Halo/24 1331 none
May 05/1820May 05/1955 14 Halo/03 0606 May 3/0602 M4/N2 N15E328525
Jun 02/0245Jun 02/1010 48 Halo/01 <1937 Jun 01/~1930 CME W limb
Jun 04/0925Jun 04/1055 64 NW/04 0726 Jun 04/0703 M3/2B N17W698552
2000
Feb 18/1130Feb 18/1215 13 W/18 0954 Feb 17/2035 M1/2N S29E078872
Apr 04/2055Apr 05/0930 55 W/04 1632 Apr 04/1541 C9/2F N16W668933
Jun 07/1335Jun 08/0940 84 Halo/06 1554 Jun 06/1525 X2/3B N20E189026
Jun 10/1805Jun 10/2045 46 Halo/10 1708 Jun 10/1702 M5/3B N22/W389026
Jul 14/1045Jul 15/1230 24,000 Halo/14 1054 Jul 14/1024 X5/3B N22/W079077
Jul 22/1320Jul 22/1405 17 NW/22 1230 Jul 22/1134 M3/2N N14/W569085
Jul 28/1050Jul 28/1130 18
Aug 11/1650Aug 11/1655 17
Sep 12/1555Sep 13/0340 320 Halo/12 1331 Sep 12/1213M1/2NS17W09
Oct 16/1125Oct 16/1840 15 Halo/16 0727 Oct 16/0728M2 N04W909182:
Oct 26/0040Oct 26/0340 15 Halo/25 0826 Oct 25/1125M2 N00W90
Nov 08/2350Nov 09/1600 14,800 Halo/08 2306 Nov 08/2328M7/multipleN00-10W75-809212,
9213,
9218
Nov 24/1520Nov 26/2030 942 Halo/24 0530 Nov 24/0502X2/3BN20W059236
2001
Jan 28/2025Jan 29/0655 49 Halo/28 1554 Jan 28/1600M1/1NS04W599313
Mar 29/1635Mar 30/0610 35 Halo/29 1026 Mar 29/1015X1/1NN24W129393
Apr 02/2340Apr 03/0745 1110 NW /02 2200 Apr 02/2151X20/ N14W829393
Apr 10/0850Apr 11/2055 355 halo/10 0530 Apr 10/0526X2/3BS23W099415
Apr 15/1410Apr 15/1920 951 W /15 1430 Apr 15/1350X14/2BS20W859415
Apr 18/0315Apr 18/1045 321 SW /18 0230 Apr 18/0214C2/2BS20W limb9415
Apr 28/0430Apr 28/0500 57 halo/26 1230 Apr 26/1312M7/2BN17W319433
May 07/1915May 08/0755 30 NW /07 1000 NW limb
June 15/1750June 16/0005 26 W /15 1648 W limb
Aug 10/1020Aug 10/1155 17 W /09 1030 Aug 09/1122none/C3Disk Center
Aug 16/0135Aug 16/0355 493 halo /15 2330 nonefar backside
Sep 15/1435Sep 15/1455 11 SW /15 1154 Sep 15/1128M1/1NS21W499608
Sep 24/1215Sep 25/2235 12,900 halo /24 1030 Sep 24/1038X2/2BS16E239632
Oct 01/1145Oct 02/0810 2360 SW/01 0530 Oct 01/0515M9 S22W919628
Oct 19/2225Oct 19/2235 11 halo /19 1650 Oct 19/1630X1/2BN15W299661
Oct 22/1910Oct 22/2130 24 SE /22 1826 Oct 22/1759X1/2BS18E169672
Nov 04/1705Nov 06/0215 31,700 halo /04 1635 Nov 04/1620X1/3BN06W189684
Nov 19/1230Nov 20/0010 34 halo /17 0530 Nov 17/0525M2/1NS13E429704
Nov 22/2320Nov 24/0555 18,900 halo /22 2330 Nov 22/2330M9/2NS15W349704
Dec 26/0605Dec 26/1115 779 W /26 0530 Dec 26/0540M7/1BN08W549742
Dec 29/0510Dec 29/0815 76 E /28 2006 Dec 28/2045X3 S26E909767
Dec 30/0245Dec 31/1620 108
2002
Jan 10/2045Jan 11/0530 91 E /08 1754 Jan 08/2025C9 E limb
Jan 15/1435Jan 15/2000 15 Halo /14 0525 Jan 14/0627M4 W limb
Feb 20/0730Feb 20/0755 13 W /20 0630 Feb 20/0612M5/1NN12W729825
Mar 17/0820Mar 17/0850 13 Halo /15 2306 Mar 15/2310M2/1FS08W039866
Mar 18/1300Mar 19/0650 53
Mar 20/1510Mar 20/1525 19 W /18 0254 Mar 18/0231M1 S09W469866
Mar 22/2020Mar 23/1320 16 Halo /22 1106 Mar 22/1114M1 W limb 9866
Apr 17/1530Apr 17/1540 24 Halo /17 0826 Apr 17/0824M2/2NS14W34 9906
Apr 21/0225Apr 21/2320 2520 Halo /21 0127 Apr 21/0151X1/1FS14W89906
May 22/1755May 23/1055 820 Halo /22 0326 May 22/0354C5/DSFS19W56
Jul 07/1830Jul 07/1955 22 W /07 1106 Jul 07/1143M1 W limb10017
Jul 16/1750Jul 17/1600 234 Halo /15 2030 Jul 15/2008X3/3BN19W0110030
Jul 19/1050Jul 19/1515 13
Jul 22/0655Jul 23/1025 28 Halo /20 2042 Jul 20/2130X3 SE limb10039
Aug 14/0900Aug 14/1620 26 NW /14 0206 Aug 14/0212M2/1NN09W5410061
Aug 22/0440Aug 22/0940 36 SW /4 0200 Aug 22/0157M5/2BS07W6210069
Aug 24/0140Aug 24/0835 317 W /24 0127 Aug 24/0112X3/1FS08W9010069
Sep 07/0440Sep 07/1650 208 Halo /05 1654 Sep 05/1706C3/DSFN09E2810102
Nov 09/1920Nov 10/0540 404 SW /09 1331 Nov 09/1323M4/2BS12W2910180
2003
May 28/2335May 29/1530 121 Halo /28 0050 May 28/0027X3/2BS07W1710365
May 31/0440May 31/0645 27 W /31 0230 May 31/0224M9/2BS07W6510365
Jun 18/2050June 19/0450 24 Halo /17 2230 Jun 17/2255M6 S08E6110386
Oct 26/1825Oct 26/2235 466 Halo /26 1754 Oct 26/1819X1/1NN02W3810484
Oct 28/1215Oct 29/0615 29500 Halo /28 1054 Oct 28/1110X17/4BS16E0810486
Nov 02/1105Nov 03/0815 1570 Halo /02 0954
Nov 04/2225Nov 05/0600 353 Halo /04 1954 Nov 04/1929X28/3BS19W8310486
Nov 21/2355Nov 22/0230 13 SW /21 0026 Nov 20/2353M5/2BN02W1710501
Dec 02/1505Dec 02/1730 86 Halo /02 1026 Dec 02/0948C7 W limb
2004
Apr 11/1135Apr 11/1845 35 SW /11 0430 Apr 11/0419C9/1FS14W4710588
Jul 25/1855Jul 26/2250 2086 Halo /25 1514 Jul 25/1514M1/1FN08W3310652
Sep 13/2105Sep 14/0005 273 Halo /12 0036 Sep 12/0056M4/2NN04E4210672
Nov 01/0655Nov 01/0805 63 W (farside) /01 0606
Nov 07/1910Nov 08/0115 495 Halo /07 1706 Nov 07 /1606X2N09W1710696
2005
Jan 16/0210[1]Jan 17/1750 5040 Halo /15 2306 Jan 15/2302X2N15W0510720
May 14/0525May 15/0240 3140 Halo /13 1722 May 13M8/2BN12E1110759
Jun 16/2200Jun 17/0500 44 West /16 2003 Jun 16/2022M4 N09W8710775
Jul 14/0245Jul 15/0345 134 Halo /13 1430 Jul 13/1449M5 N10W8010786
Jul 27/2300Jul 29/1715 41 Halo /27 0454 Jul 27/0502M3 N11E9010792
Aug 22/2040Aug 23/1045 330 Halo /22 1730 Aug 22/1727M5/1NS12W6010798
Sep 08/0215Sep 11/0425 1880 East /07 1723 Sep 07/1740X17/3BS06E8910808
2006
Dec 06/1555Dec 07/1930 1980 Halo Dec 05/1035X9/2NS07E7910930
Dec 13/0310Dec 13/0925 698 Halo /13 0254 Dec 13/0240X3/4BS05W2310930
2007
None
2008
None
2009
None
2010
Aug 14/1230Aug 14/1245 14 West /14 1730 Aug 14/1005C4/0FN17W5211099
2011
Mar 08/0105Mar 08/0800 50 NW /07 2000 Mar 08/2012M3/SfN24W5911164
Mar 21/1950Mar 22/0135 14 NW /21 0236 (farside)11169
Jun 07/0820Jun 07/1820 72 Halo /07 0803 Jun 07/0641M2/2NS21W6411226
Aug 04/0635Aug 05/2150 96 Halo /04 0412 Aug 04/0357M9/2BN15W4911261
Aug 09/0845Aug 09/1210 26 Halo /09 0812 Aug 09/0805X6/2BN17W8311263
Sep 23/2255Sep 26/1155 35 Halo (asymmetric) /22 1048 Sep 22/1101X1/2NN11E7411302
Nov 26/1125Nov 27/0125 80 Halo /26 0712 Nov 26/0710C1/long durationN08W4911353
2012
Jan 23/0530Jan 24/1530 6310 Halo /23 0400 Jan 23/0359M8/long durationN28W3611402
Jan 27/1905Jan 28/0205 796 Halo /27 1827 Jan 27/1837X1/long durationN27W7111402
Mar 07/0510Mar 08/1115 6530 Halo /07 0036 Mar 07/0024X5/3BN17E1511429
Mar 13/1810Mar 13/2045 469 Halo /13 1736 Mar 13/1741M7 N18W6211429
May 17/0210May 17/0430 255 Partial Halo /17 0148 May 17/0147M5 N12W8911476
May 27/0535May 27/1045 14 Halo (asymmetric)/27 2112 (Farside) 11428
Jun 16/1955Jun 16/2020 14 Halo (asymmetric)/14 1430 Jun 14/1435M1 S17E1411504
Jul 07/0400Jul 07/0745 25 Halo (asymmetric)/06 2312 Jul 06/2308X1 S18W5011515
Jul 12/1835Jul 12/2225 96 Halo (asymmetric)/12 < 1710 Jul 12/1649X1 S16W0911520
Jul 17/1715Jul 18/0600 136 Partial Halo/17 1348 Jul 17/1715M1 S17W7511520
Jul 23/1545Jul 23/2145 12 Partial Halo (asymm.)/23 0236 (Farside) 11520
Sep 01/1335Sep 02/0850 59 Full Halo/31 2012 31/2043C8 S06E20None
Sep 28/0300Sep 28/0445 28 Full Halo/28 0018 27/2357C3 N08W4111577
2013
Mar 16/1940Mar 17/0700 16 Asymm. Full Halo/15 0712 15/0658M1 N11E1211692
Apr 11/1055Apr 11/1645 114 Asymm. Full Halo/11 0724 11/0716M6 N09E1211719
May 15/1325May 17/1720 41 Asymm. Full Halo/15 0148 15/0148X1 N11E5111748
May 22/1420May 23/0650 1660 Asymm. Halo/22 1325 22/1332M5/long duration N15W7011745
Jun 23 2014Jun 24/0520 14 CME (C2, COR2-A)/21 0312 21/0314M2 S16E6611777
Sep 30 0505Sep 30/2005 182 CME (C2)/29 2212 29/2337C1 N15W40erupting filament
Dec 28 2150Dec 28 2315 29 CME (C2)/28 1736 28/1802C9 S18E0711936
2014
Jan 06/0915Jan 06/1600 42 Asymm. Partial Halo/06 0800 (Farside) 11936
Jan 06/0915Jan 09/0340 1033 Asymm. Partial Halo/07 1824 07/1832X1 S15W1111944
Feb 20/0850Feb 20/0925 22 Asymm. Full Halo W. limb/20 0800 20/0755M3 S15W6711976
Feb 25/1355Feb 28/0845 103 Asymm. Halo/25 0130 25/0049X4 S12E8211990
Apr 18/1525Apr 19/0105 58 CME (C3)/18 1325 18/1303M7 S16W4112036
Sep 11/0240Sep 12/1555 126 Asymm. Full Halo/10 1800 10/1745X1 N16W0612158
2015
Jun 18/1135Jun 18/1445 16 Narrow SW limb event/18 0125 18/0127M1 SW limb12365
Jun 21/2135Jun 22/1900 1070 Full halo/21 0236 21/0236M2 N13W0012371
Jun 26/0350Jun 27/0030 22 Asymmetric full halo/25 0836 25/0816M7 N12W4012371
Oct 29/0550Oct 29/1000 23 Far-sided on W limb, S11/29 0236 (Farside) 12434
2016
Jan 02/0430Jan 02/0450 21 SW limb event/02 2324 02/0011M2 S21W7312473
2017
Jul 14/0900Jul 14/2320 22 Asymmetric full halo/14 0125 14/0209M2 S06W2912665
Sep 05/0040Sep 08/0035 844 Asymmetric full halo/04 2042 04/2033M5 S11W1612673
Sep 10/1645Sep 11/1145 1490 Asymmetric full halo/10 1600 10/1606X8 S08W8312673

[1]   The >10 MeV proton event began on January 16 at 0210 UTC following the X2.6 flare late on the 15th. The peak flux following this flare was 365 pfu at 16/1840 UTC. The >10 MeV protons decayed to 117 pfu by midday on January 17 when a stronger injection of protons occurred following the X3.8 flare and CME. This new infusion began at 17/1240 UTC and peaked with 5040 pfu at 17/1750 UTC. The event decayed to about 19 pfu early on January 20 when yet another proton flare occurred. The X7 flare and CME that occurred on January 20 produced the hardest and most energetic proton event of Cycle 23. The >10 MeV protons peaked at 1860 pfu at 20/0810 UTC. The >100 MeV protons peaked at 652 pfu at 20/0710 UTC, which was the highest >100 MeV proton flux level observed since 1989 October (680 pfu). The >10 MeV proton event finally ended at 22/1755 UTC.
[1989 October proton storm plot] Compare the amazing proton events of 1989 October with the proton storm of 1997 November.

Please Note: Proton fluxes are integral 5-minute averages for energies >10 MeV, given in Particle Flux Units (pfu), measured by GOES spacecraft at Geosynchronous orbit: 1 pfu = 1 p cm-2 sr-1 s-1. SESC defines the start of a proton event to be the first of 3 consecutive data points with fluxes greater than or equal to 10 pfu. The end of an event is the last time the flux was greater than or equal to 10 pfu. This definition, motivated by SESC customer needs, allows multiple proton flares and/or interplanetary shock proton increases to occur within one SESC proton event. Additional data may be necessary to more completely resolve any individual proton event.

Different detectors, onboard different GOES spacecraft, have taken the data since 1976. These proton data were processed using various algorithms. To date, no attempt has been made to cross-normalize the resulting proton fluxes.

Flare associations are given, although data about individual coronal mass ejections (CMEs), available from SOHO only since 1996, are necessary fully to characterize each event. CME information for earlier events from the SOLWIND and SMM coronagraphs will be added in the future.

For more information on SEP events, contact Bob Rutledge of the NOAA Spa e weather Prediction Center.

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