Images and Lightcurves

Once images at different energies or times are obtained, we are ready to infer spectra as well as lightcurves of individual sources. By examining images at various energies and times, we identified footpoint and/or looptop sources. For each source, we selected a box to enclose it and summed over all the pixel values in this box, divided by the width of the energy bin, to get the differential photon flux. If available, Images from Transition Region And Coronal Explorer (TRACE) were used to help distinguish individual sources. Plotting the flux versus energy (time) results in the spectrum (lightcurve) and in turn the characteristics of the spectrum (lightcurve) provides clues on the nature of the source.

Table: List of flare events included in this study.

Flare ID	Peak time	Disk	NOAA	GOES	Peak	Highest	Notes
(ymmdd#)	(UT)	position	AR #	class	Count	E-band
						(keV)
2022003	11:06:18	N13W73?	-	C7.5	656	50-100	3 FPs, no LT?
2032819	17:58:18	S04W90	-	C7.6	200	25-50	one source (LT)?
2041509	23:12:26	N21W77	9893?	M1.2	816	25-50	complex$^T$
2051706	07:38:10	N13E89?	-	M1.5	1328	25-50	2 LTs?
2051909	21:46:22	S23E78	-	C4.7	84	25-50	source not well def.
2062904	09:29:46	S17E79	-	C2.0	352	12-25	single
2072301	00:30:06	S13E74	0039	X4.8	57379	800-7000	complex$^T$
2072307	12:21:42	S19E78	-	C2.9	240	25-50	complex$^T$?
2080327	19:06:54	S16W83	0039	X1.0	28697	25-50	complex$^T$
2080602	05:18:18	N17E92	-	C2.1	108	25-50	single?
2081203	02:17:18	S08E86	-	C1.4	160	25-50	single
2082336	16:10:18	S10W88	-	-	104	25-50	single$^T$
2082418	11:16:10	S05W89	0069?	-	400	25-50	complex (multi-LTs)$^T$?
2082803	10:59:30	S18W79	0083	C5.7	912	50-100	complex
2082809	18:10:46	N10E87	-	C6.6	784	12-25	one source (LT)
2090309	12:45:42	S08W77	0087?	C1.5	128	25-50	complex
2090608	16:27:02	S06E89	-	C9.2	752	25-50	loop not well def?
2090801	01:39:10	S11E79	0105	M1.5	1072	12-25	complex
2092002	09:26:42	S25E75	0126	M1.8	1520	800-7000	single
2111410	11:09:38	S15E71	0195?	C5.5	352	50-100	2 FPs
2112532	21:50:30	S13W89	-	C?	72	25-50	single
3021411	09:17:18	N12W88	-	M1.2	1072	25-50	one source

Note: (1) Peak counts (counts/s) are in the 12-25 keV energy band. (2) 'single' = single loop; about 6 events are probably of this type. (3) 'complex' = complex morphology; roughly about 8 events fall into this category. (4) 'one source' = only one source was detected; about 3 events have this characteristics. (5) The superscript 'T' denotes those flares with TRACE data available in the RHESSI FOV.