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Table 1

Heliospheric location, Parker spiral length, and onset time of the event seen at different spacecraft.

HGI HGI Distance Parker spiral Shortest SEP Estimated SRT Observed SEP
latitude longitude to the Sun length travel time onset time (1 GeV p) event type
STA 7.3° 275.4° 0.96 au 1.11 au 631.4 s 10.18 10:07 Slowly rising
MES 2.1° 290.9° 0.35 au 0.36 au 204.8 s 03:14 03:11 Slowly rising
Earth −2.4° 160.7° 1.01 au 1.18 au 671.2 s 01:56 01:45 Rapidly rising
MSL −7.3° 121.8° 1.46 au 1.92 au 1092 s 02:04 01:46 Rapidly rising
STB −4.7° 42.7° 1.00 au 1.16 au 659.8 s 11:06 10:55 Slowly rising

Notes. The flare source region at the Sun is NOAA active region 11476 with co-ordinate of N11 W76 and the flare onset time is 01:25 on 17th May 2012.

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