Properties of sunspot penumbral grains observed with Hinode

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Table 1

Properties of penumbral grains.

	Blue continuum (4504 Å)						G band (4305 Å)


Parameters	INW (54%)		OUT (19%)		STB (27%)		INW (56%)		OUT (13%)		STB (31%)


	mean	max	mean	max	mean	max	mean	max	mean	max	mean	max


Lifetime(min)	14.7	75.3	8.0	41.34	7.6	31.0	13.5	66.8	7.0	16.0	7.0	35.4
Trajectory(′′)	0.8	3.6	0.6	2.3			0.7	2.6	0.5	1.1
Position(′′)	10.0		14.1		12.6		9.9		13.7		12.4
Speed(km s^-1)	0.71	2.13(2)^a	0.93	3.7(7)			0.70	2.15(1)	0.85	1.9
Intensity	0.89	1.14	0.99	1.17	0.94	1.14	0.88	1.12	0.98	1.18	0.91	1.19
Long axes(′′)^b	0.52		0.57		0.51		0.59		0.52		0.51
Short axes(′′)^b	0.23		0.25		0.21		0.23		0.23		0.21
Eccentricity^b	0.90		0.90		0.91		0.89		0.89		0.91

Notes.

^(a)

Number of penumbral grains with speed faster than 2 km s^-1;

^(b)

average long axes, short axes, and eccentricity if we do an ellipse fit according the shape.

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