The YOHKOH survey of partially occulted flares in hard X-rays

M. Tomczak

doi:10.1051/0004-6361/200911732

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Volume 502 / No 2 (August I 2009)

A&A, 502 2 (2009) 665-678

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Table 5:

Surveys comparing power-law spectrum indices of hard X-ray loop-top and footpoint sources.
	Time	Energy	Energy	Power-law index ${\gamma}^{a}$
Satellite	period	range	res.	loop-top						footpoint						Refs.^b
	[YY/MM]	[keV]	[keV]	N	Mn	Md	SD	K	S	N	Mn	Md	SD	K	S
OSO-7	71/10-72/12	10-300	$\sim$ 30	25	4.8	4.8	1.0	-1.0	0.1	59	3.9	3.8	1.1	-0.6	0.6	(1)
Yohkoh	91/10-96/05	14-33	10	25	8.2	8.1	1.5	-1.1	-0.1	16	7.3	7.7	1.3	-0.9	-0.4	(2)
Yohkoh	91/10-98/08	14-53	10-20	12^c	6.6	6.2	1.5	0.2	0.4	18^c	5.2	4.9	1.6	-1.0	0.4	(3)
Yohkoh	91/10-98/08	14-93	10-40	5^c	5.5	5.3	1.3	-1.5	0.2	13^c	4.3	4.1	1.0	-1.0	0.7	(3)
Yohkoh	91/10-01/12	14-33	10	52	7.5	7.6	1.6	-0.5	-0.1	620	4.8	4.6	1.6	-0.6	0.4	(4)
Yohkoh	91/10-01/12	23-53	10-20	23	6.7	6.9	1.4	-0.7	-0.2	338	4.0	3.8	1.1	2.1	1.0	(4)
Yohkoh	91/10-01/12	33-93	20-40	3	-	-	-	-	-	155	3.4	3.4	0.7	1.2	0.6	(4)
Yohkoh	91/10-01/12	14-53	10-20	7^d	5.6	5.2	1.4	-1.3	0.2	185^d	3.9	3.7	1.1	0.8	0.8	(4)
Yohkoh	91/10-01/12	23-93	10-40	1^d	-	-	-	-	-	130^d	3.3	3.2	0.7	1.4	0.6	(4)
RHESSI	02/02-05/07	3-1.7 $\times10^4$	1-5	5^c	5.1	5.6	1.2	-2.0	-0.3	10^c	2.9	2.8	0.5	-1.4	0.1	(5)
RHESSI	02/02-04/08	3-1.7 $\times10^4$	1-5	50	5.4	5.5	1.2	-0.8	0.3	0	-	-	-	-	-	(6)
RHESSI	02/02-05/08	3-1.7 $\times10^4$	1-5	0	-	-	-	-	-	174^c	3.3	3.1	0.5	0.3	0.7	(7)

^a N - number of events; Mn - mean, Md - median, SD - standard deviation, K - kurtosis; S - skewness.
^b (1) - Roy & Datlowe (1975); (2) - Mariska & McTiernan (1999); (3) - Petrosian et al. (2002); (4) - this issue; (5) - Battaglia & Benz (2006, 2007); (6) - Krucker & Lin (2008); (7) - Saint-Hilaire et al. (2008).
^c Imaging spectroscopy.
^d Events unbiased by the thermal component.

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