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Table 1

The ten electron/3He-rich SEP events.

N Date Ions Electrons below ~6−9 keV Electrons above ~10 keV Type III/II GOES SXRc Hα Flarec CMEd
3He/4Hea Releaseb Durationb Releaseb Durationb Releaseb Durationb Release Class Location Launche V PA Width
(UT) (min) (UT) (min) (UT) (min) (UT) (UT) (km s-1) (deg) (deg)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16)
1 1998 Aug. 18 1.32 ± 0.26 02:41 ± 00:31 190−320 01:58 ± 00:08 90−170 02:12 ± 00:04.2 12−60 III ... ... ... ...
2 1999 Aug. 7 1.52 ± 0.08 18:37 ± 00:50 280−530 16:45 ± 00:06 50−130 17:02 ± 00:01.2 8−12 III/16:55 M1.2 S15W24 16:42 577 297 7
3 2000 Apr. 1 0.11 ± 0.02 19:53 ± 00:37 200−530 19:04 ± 00:07 60−230 19:20 ± 00:03.9 20−25 III/19:05 N10W54 18:50 586 291 33
4 2000 Jun. 4 0.30 ± 0.02 07:36 ± 00:13 170−300 06:41 ± 00:09 80−150 07:01 ± 00:01.5 15−23 III/06:54 06:51 597 295 17
5 2002 Jun. 30 0.16 ± 0.06 11:54 ± 00:43 290−800 08:58 ± 00:12 130−270 09:06 ± 00:01.9 20−30 III C2.1 08:28 623 299 30
6 2002 Sep. 22 0.54 ± 0.02 24:04 ± 00:29 170−250 23:32 ± 00:04 80−120 23:36 ± 00:02.0 15−40 III/23:36 23:31 960 287 140
7 2002 Sep. 24 0.75 ± 0.05 11:50 ± 00:25 170−280 10:52 ± 00:06 100−180 11:07 ± 00:01.5 8−18 III/10:50 10:56 1104 277 62
8 2002 Oct. 20 1.47 ± 0.05 14:46 ± 00:33 240−570 13:33 ± 00:07 70−130 14:06 ± 00:01.8 5−40 III/14:03 C6.6 S13W63 13:52 1011 247 20
II/14:24
9 2002 Dec. 12 1.11 ± 0.07 01:24 ± 00:43 190−400 00:11 ± 00:05 80−130 00:35 ± 00:01.4 17−18 III/00:32 00:33 624 297 13
10 2002 Dec. 12 0.39 ± 0.03 13:29 ± 01:02 220−420 12:16 ± 00:07 60-150 12:35 ± 00:01.2 10-20 III/12:28 12:13 723 287 51

Notes.

(a)

The 3He/4He ratio is calculated at 0.5−2.0 MeV/nucleon.

(b)

The release is energy-averaged; the duration is energy-dependent.

(c)

The flare information is from the Solar Geophysical Data (SGD).

(d)

The CME information is from the SOHO LASCO CME catalog (http://cdaw.gsfc.nasa.gov/CME_list/).

(e)

The CME launch time is estimated from linear extrapolation to the photosphere, after subtracting the photon travel time of 500 s.

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