Suprathermal helium in corotating interaction regions: combined observations from SOHO/CELIAS/STOF and ACE/SWICS

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Volume 599 (March 2017)

A&A, 599 (2017) A13

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Table 1

CIR events with suprathermal ions at STOF.

Event	Year	Start time	Stop time	Spectra in F′			Spectra in F			Notes
		DOY, hh:mm	DOY, hh:mm	To	Mx	Pl	To	Mx	Pl

With reverse shocks

1^⋄	1999	137, 23:47	138, 19:17				^●
2	1999	227, 09:40	229, 01:23			^●			^●
3	2000	054, 08:02	055, 13:59			^•		^•		^h
4 ^⋆	2003	207, 01:20	208, 04:42			^●	^●
5 ^⋆	2004	324, 14:16	326, 00:38			^●			^●
6 ^⋆	2005	236, 04:50	236, 20:23			^○		^○		^a ^b ^c ^f
7 ^⋆	2005	280, 10:13	281, 06:14			^●	^●

Without reverse shocks

8	1999	059, 12:38	061, 03:36			^●			^●
9	2000	028, 05:16	029, 08:54			^•	^•			^h
10	2000	036, 16:26	037, 23:02	^●			^●
11^⋄	2000	082, 00:34	083, 01:40		^○				^○	^c
12 ^⋆	2000	143, 09:27	144, 13:45			^○			^○	^a^b^c^d
13 ^⋆	2001	284, 16:03	285, 12:14			^○			^○	^a^b^c^g
14 ^⋆	2002	010, 01:14	011, 07:19			^○			^○	^e
15 ^⋆	2002	324, 10:00	326, 00:15	^●			^●
16 ^⋆	2003	259, 23:15	260, 12:43	^●			^●

Notes. Start and stop time of the compression region based on the physical properties of the solar wind are shown with day of year and coordinated universal time (DOY, hh:mm in the table). “To”, “Mx” and “Pl” columns list different spectral shapes: turnover spectra, the superposition of turnover and power-law spectra, and power-law spectra, respectively.

^(⋄)

Events 1 and 11 have a data gap in STOF measurements and do not cover the full time period.

^(⋆)

Events 4–7 and 12–16 include SWICS measurements.

^(●)

Means “clean” CIR events, listed in Jian et al. (2006) and Mason et al. (2008).

^(○)

Indicates ICMEs or SEPs.

^(•)

Marks CIR events that are possibly contaminated by upstream ion events.

^(a)

Interacted with ICMEs, suggested by Jian et al. (2006).

^(b)

In the ICME list surveyed by Richardson & Cane (2010).

^(c)

In the SEP list studied by Cane et al. (2010).

^(d)

Analysed by Mason et al. (2004) as ³He-rich SEP events.

^(e)

Included in the list of large SEP events, given by Desai et al. (2006).

^(f)

Can be found in the SEP list of Cliver et al. (2012).

^(g)

In the interplanetary shock event list of Desai et al. (2003).

^(h)

Marks CIR events that are possibly contaminated by upstream ion events. There are strong indications of upstream events associated with CIR 09. For the case of CIR 03, however, upstream events are not clear (suggested by A. Klassen, pers. comm.).

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