2015A&A...576A.136M

Query : 2015A&A...576A.136M

2015A&A...576A.136M - Astronomy and Astrophysics, volume 576A136-136 (2015/4-1)

The structure of solar radio noise storms.

MERCIER C., SUBRAMANIAN P., CHAMBE G. and JANARDHAN P.

Abstract (from CDS):

The Nancay Radioheliograph (NRH) routinely produces snapshot images of the full sun (field of view ∼3R_☉) at 6 or 10 frequencies between 150 and 450MHz, with typical resolution 3-arcmin and time cadence 0.2s. Combining visibilities from the NRH and from the Giant Meterwave Radio Telescope (GMRT) allows us to produce images of the sun at 236 or 327MHz, with the same field as the NRH, a resolution as low as 20-arcsec, and a time cadence 2s. We seek to investigate the structure of noise storms (the most common non-thermal solar radio emission) which is yet poorly known. We focus on the relation of position and altitude of noise storms with the observing frequency and on the lower limit of their sizes. We use an improved version of a previously used method for combining NRH and GMRT visibilities to get high-resolution composite images and to investigate the fine structure of noise storms. We also use the NRH data over several consecutive days around the common observation days to derive the altitude of storms at different frequencies. We present results for noise storms on four days. Noise storms consist of an extended halo and of one or several compact cores with relative intensity changing over a few seconds. We found that core sizes can be almost stable over one hour, with a minimum in the range 31-35-arcsec (less than previously reported). The heliocentric distances of noise storms are ∼1.20 and 1.35R_☉ at 432 and 150MHz, respectively. Regions where storms originate are thus much denser than the ambient corona and their vertical extent is found to be less than expected from hydrostatic equilibrium. The smallest observed sizes impose upper limits on broadening effects due to scattering on density inhomogeneities in the low and medium corona and constrain the level of density turbulence in the solar corona. It is possible that scatter broadening has been overestimated in the past, and that the observed sizes cannot only be attributed to scattering. The vertical structure of the noise storms is difficult to reconcile with the classical columnar model.

Abstract Copyright: ∼

Journal keyword(s): Sun: radio radiation - Sun: corona - Sun: activity

Simbad objects: 202

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Number of rows : 202

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	IC 5376	LIN	00 01 19.7722177128	+34 31 32.443831128		15.0				~	69	0
2	Z 382-21	Sy2	00 03 05.6532278352	-01 54 49.909114908		13.92	13.32	12.40	12.08	~	116	0
3	NGC 7819	GiG	00 04 24.495	+31 28 19.30		14.3				~	134	0
4	IC 1528	EmG	00 05 05.365	-07 05 36.32		13.5		13.5	13.2	~	72	0
5	Z 408-26	AG?	00 05 13.8796086216	+06 46 19.204496040		14.7				~	74	0
6	NGC 1	GiP	00 07 15.8562637560	+27 42 29.020113144		13.4				~	126	0
7	NGC 36	LIN	00 11 22.2984769368	+06 23 21.623562132		14.5				~	97	0
8	MCG-02-02-030	Sy2	00 30 07.308	-11 06 49.19		13		12.65		~	77	0
9	Z 409-28	AGN	00 31 23.840	+08 28 01.32		14.6		13.10		~	110	0
10	MCG+01-02-029	LIN	00 33 57.3223660224	+07 16 05.794430448		15				~	31	0
11	NGC 169	SyG	00 36 51.6072915048	+23 59 27.553231968		13.70	13.1			~	127	0
12	NGC 175	Sy2	00 37 21.5488991448	-19 56 03.358974336		12.95		11.73	12.4	~	110	0
13	NGC 180	GiG	00 37 57.7068082440	+08 38 06.754410816		14.3				~	109	0
14	NGC 192	GiC	00 39 13.39127	+00 51 50.8860		13.9		11.97		~	145	1
15	NGC 216	EmG	00 41 26.885	-21 02 52.90		13.52	13.12	12.64	13.3	~	92	0
16	NGC 237	AGN	00 43 27.8628000144	-00 07 29.805209400		13.65	13.06	12.53	11.85	~	161	0
17	IC 1652	GiG	01 14 56.2762772544	+31 56 54.519259488		14.3				~	53	0
18	NGC 444	GiC	01 15 49.584	+31 04 48.83		14.7				~	104	0
19	Z 520-33	GiG	01 15 51.851	+33 48 38.83		14.8				~	76	0
20	Z 502-25	GiG	01 19 10.008	+33 01 50.00		15.0				~	71	0
21	NGC 477	Sy2	01 21 20.3410541880	+40 29 17.414141208		14.0				~	110	0
22	IC 1683	GiG	01 22 38.867	+34 26 13.21		14.2				~	101	0
23	NGC 499	LIN	01 23 11.4954761664	+33 27 36.656232300		13.0	12.3			~	181	0
24	NGC 496	GiG	01 23 11.5872831672	+33 31 45.417105984		14.3				~	118	0
25	NGC 528	GiG	01 25 33.5744235360	+33 40 17.086008828		13.7				~	79	0
26	Z 436-62	AG?	01 28 53.433	+13 47 33.26		14.64				~	73	1
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28	NGC 776	GiG	01 59 54.5182947984	+23 38 39.440979708		13.4				~	125	0
29	NGC 810	LIN	02 05 28.5494795136	+13 15 05.494803012		15.4				~	54	1
30	NGC 825	GiP	02 08 32.3336018208	+06 19 24.970524240		14.5				~	74	0
31	Z 483-63	AG?	02 28 22.1180270592	+23 12 52.559633268		15.0				~	68	0
32	NGC 1056	Sy2	02 42 48.2914236192	+28 34 26.660028468		13.5				~	180	0
33	Z 505-49	GiP	02 45 09.6775565064	+32 59 23.008191828		14.9	13.68			~	46	0
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38	UGC 3107	GiG	04 37 21.8525118720	+09 32 40.246202868		16.5				~	43	0
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48	Z 147-61	Sy2	07 44 09.1275236304	+29 14 50.762711400		13.28				~	145	1
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50	Z 178-14	GiG	07 59 13.0699024344	+32 54 52.934088096		13.5				~	114	1
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52	NGC 2730	G	09 02 15.839	+16 50 17.51		13.7				~	89	0
53	NGC 2880	GiG	09 29 34.5699581472	+62 29 26.020090572		12.6				~	166	0
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55	IC 540	Sy2	09 30 10.261	+07 54 09.10		14.8				~	77	0
56	NGC 2906	AGN	09 32 06.2228278920	+08 26 30.486567516		13.1				~	189	0
57	NGC 2916	Sy2	09 34 57.5933209584	+21 42 18.960584796	12.81	12.74	12.05			~	162	1
58	Z 152-31	G	09 35 26.2841238528	+29 48 45.490357944		15.0				~	75	0
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61	Z 64-34	GiG	10 01 40.466	+10 45 22.91		14.6				~	73	0
62	NGC 3106	LIN	10 04 05.2518653088	+31 11 07.659854232		14.0				~	108	0
63	Z 123-22	Sy2	10 12 03.65905	+23 05 07.6317		15.3				~	52	0
64	NGC 3160	Sy2	10 13 55.0760744136	+38 50 34.394956404		15.2				~	74	0
65	Z 124-16	AG?	10 22 14.000	+20 35 21.57		15.5				~	64	0
66	NGC 3303	LIN	10 37 00.0631479552	+18 08 08.888744688		14.5				~	84	0
67	Z 212-30	LIN	10 37 19.3424977080	+43 35 15.305053488		14.6				~	91	1
68	NGC 3381	GiG	10 48 24.7990862064	+34 42 41.068596852		12.8				~	180	0
69	Z 184-37	LIN	10 55 55.2559428168	+36 51 41.494143924		14.6				~	59	0
70	IC 674	LIN	11 11 06.3568843680	+43 37 58.713641652		14.5				~	85	0
71	NGC 3614	GiG	11 18 21.3370383720	+45 44 53.524032396		12.7				~	137	0
72	NGC 3811	H2G	11 41 16.6113724536	+47 41 26.982320640		13.0				~	182	0
73	NGC 3991	EmG	11 57 30.465	+32 20 03.00		13.8				~	163	1
74	NGC 3994	LIN	11 57 36.8662975416	+32 16 39.447161112		13.51	12.87			~	207	1
75	NGC 4003	LIN	11 57 59.0256271248	+23 07 29.592588396		14.8				~	83	0
76	Z 157-86	GiC	12 02 03.164	+29 50 53.11		14.3				~	109	0
77	NGC 4149	GiG	12 10 32.854	+58 18 14.81		13.9				~	72	0
78	NGC 4185	LIN	12 13 22.1960178360	+28 30 39.646606428		13.5				~	116	0
79	NGC 4210	LIN	12 15 15.8513778552	+65 59 07.052376192		13.4				~	148	0
80	IC 776	EmG	12 19 03.119	+08 51 22.15		14.9				~	154	0
81	NGC 4470	H2G	12 29 37.8066943368	+07 49 27.284422224		12.9				~	257	0
82	NGC 4644A	GiP	12 42 42.6501505728	+55 08 43.928947644		14.8				~	85	0
83	NGC 4676A	AGN	12 46 10.05987	+30 43 54.6380						~	286	2
84	NGC 4676B	AGN	12 46 11.2495347624	+30 43 21.856578924		14.1				~	127	1
85	NGC 4874	LIN	12 59 35.7093764280	+27 57 33.293892204	13.01	13.7	12.71	12.27	11.386	~	814	3
86	Z 270-37	LIN	12 59 39.7432926744	+53 20 28.547292984		15.0				~	66	0
87	Z 271-19	LSB	13 08 37.262	+54 04 28.02		14.2				~	64	0
88	Z 316-11	GiG	13 08 46.5057756192	+62 16 18.162586956		13.8				~	53	0
89	NGC 5000	SBG	13 09 47.454	+28 54 25.07		14.0	13.41			~	182	1
90	Z 189-32	GiC	13 10 20.061	+32 28 54.41		15.6				~	72	0
91	Z 217-16	EmG	13 11 11.3132945664	+43 43 35.193176652		15.7				~	54	0
92	NGC 5205	LIN	13 30 03.5953653072	+62 30 41.584939200		13.5				~	139	0
93	NGC 5216	Sy2	13 32 06.9115980360	+62 42 02.424417552		16.80	16.14			~	137	0
94	Z 218-50	EmG	13 48 39.119	+43 24 44.73		14.6				~	100	0
95	IC 944	GiP	13 51 30.897	+14 05 31.66		14.7				~	86	0
96	Z 190-68	LIN	13 52 06.6808959096	+38 04 01.467729408		14.8				~	64	0
97	Z 132-27	LIN	13 52 22.7399528952	+21 32 21.657094296		14.5				~	66	0
98	NGC 5378	LIN	13 56 51.0226429536	+37 47 50.075664720		13.8				~	113	0
99	NGC 5394	H2G	13 58 33.6405096192	+37 27 12.732147036		13.7	13.12			~	215	2
100	NGC 5406	LIN	14 00 20.1233388144	+38 54 55.474400196		13.1				~	133	0
101	NGC 5485	LIN	14 07 11.3594809920	+55 00 06.084219996	14.34	13.82	12.22			~	267	0
102	Z 103-107	GiG	14 10 45.4503942216	+15 12 33.840910116		14.7				~	84	0
103	NGC 5520	AGN	14 12 22.8055823616	+50 20 54.479575320		13.3				~	141	0
104	NGC 5614	GiG	14 24 07.5872943864	+34 51 31.813653924		12.6				~	156	1
105	NGC 5630	AG?	14 27 36.581	+41 15 28.14		13.6				~	125	0
106	NGC 5682	GiP	14 34 44.963	+48 40 12.93		15.1				~	105	0
107	NGC 5720	LIN	14 38 33.2828437080	+50 48 54.897094260		14.7				~	77	0
108	Z 248-18	GiG	14 41 32.0219639160	+44 30 45.962947872		13.59				~	114	0
109	NGC 5784	GiG	14 54 16.4510371920	+42 33 28.382514552		13.7				~	87	0
110	Z 248-45	GiP	15 01 32.450	+48 19 11.65		14.9				~	103	0
111	NGC 5888	LIN	15 13 07.3724076672	+41 15 52.641896508		14.3				~	98	0
112	NGC 5908	GiG	15 16 43.2078654048	+55 24 33.341168448		13.5				~	174	1
113	NGC 5929	Sy1	15 26 06.1564333536	+41 40 14.384294616		13.0	14.00			~	450	0
114	NGC 5930	AGN	15 26 07.9964334517	+41 40 33.691556640		13.0				~	441	0
115	Z 222-18	EmG	15 29 50.6461688232	+42 37 44.356517652		15.6				~	86	0
116	NGC 5947	AGN	15 30 36.5925666192	+42 43 01.769449836		14.8				~	92	0
117	Z 222-24	AG?	15 32 51.958	+41 11 29.53		15.3				~	62	0
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119	IC 4566	LIN	15 36 42.1586294592	+43 32 21.525766872		14.3				~	96	0
120	NGC 5987	GiG	15 39 57.3733917696	+58 04 46.195631832		13.3				~	98	0
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122	NGC 6020	GiG	15 57 08.1313437552	+22 24 16.476776928		14.5				~	77	0
123	NGC 6021	LIN	15 57 30.6915518928	+15 57 21.916949004		14.1				~	77	0
124	NGC 6032	GiG	16 03 01.1201862024	+20 57 21.239605764		15.0				~	76	0
125	Z 167-26	G	16 06 40.18179	+30 05 56.6421		14.4				~	126	0
126	NGC 6063	AG?	16 07 13.0021003512	+07 58 44.434838856		14.1				~	165	0
127	IC 1199	AG?	16 10 34.3421521752	+10 02 25.427146092		14.6				~	73	0
128	NGC 6081	LIN	16 12 56.8487186784	+09 52 01.414323552		14.4				~	73	0
129	Z 298-25	AG?	16 17 21.1517117352	+59 19 12.430734852		14.8				~	72	0
130	NGC 6125	AG?	16 19 11.5344941208	+57 59 02.863041504		13.0				~	106	0
131	NGC 6132	GiG	16 23 38.8442100048	+11 47 10.589536248		14.8				~	73	0
132	NGC 6146	Bla	16 25 10.3269925320	+40 53 34.331514324		13.8				~	139	1
133	NGC 6154	LIN	16 25 30.4846438032	+49 50 24.910783008		13.60				~	81	1
134	Z 109-16	LIN	16 25 49.9231151952	+16 34 34.058419500		15.5				~	60	0
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136	Z 80-31	GiG	16 26 46.692	+11 34 48.63		15.0				~	88	0
137	Z 109-19	AG?	16 27 02.9738394312	+16 22 55.995975588		15.1				~	58	0
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139	NGC 6168	GiP	16 31 21.477	+20 11 01.38		15.22				~	99	0
140	Z 139-27	GiG	17 00 14.581	+23 06 22.83		15.3				~	64	2
141	Z 225-34	GiG	17 04 52.969	+41 51 55.75		14.2				~	46	0
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146	NGC 6338	Bla	17 15 22.9842192344	+57 24 40.346559927		14.2		8		~	205	2
147	Z 299-71	Sy1	17 16 47.72291	+61 55 12.4198		14.50				~	67	1
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149	IC 1256	AG?	17 23 47.2869698760	+26 29 11.470994700		14.297	13.551	13.022	12.434	~	106	0
150	NGC 6394	Sy2	17 30 21.4214207088	+59 38 23.604551520		15.27				~	106	1
151	Z 140-45	LIN	17 34 06.4351060416	+25 20 38.250057372		14.6				~	49	0
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153	NGC 6427	GiP	17 43 38.5939706616	+25 29 38.119328808		14.6				~	47	0
154	Z 141-10	LIN	17 46 21.9197060616	+26 32 37.678404084		14.50				~	77	0
155	NGC 6478	GiG	17 48 38.3418843264	+51 09 26.204414436		14.1				~	89	1
156	NGC 6497	AG?	17 51 17.9729051760	+59 28 15.130952292		14.3				~	68	0
157	NGC 6515	G	17 57 25.1935412208	+50 43 41.231792496		14.3				~	45	0
158	Z 228-6	LIN	18 24 46.2665050920	+41 29 33.837255060		14.5				~	49	0
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160	NGC 6762	Sy2	19 05 37.0826868072	+63 56 02.712621192		14.2				~	58	0
161	MCG+07-41-003	Bla	19 59 28.35656837	+40 44 02.0972325		16.22	15.10			~	2537	2
162	MCG-02-51-004	GiG	20 15 39.8647765272	-13 37 19.147882800		14		13.23		~	60	0
163	NGC 6941	G	20 36 23.4741258768	-04 37 07.445724024		13.3		13.3	12.9	~	92	3
164	NGC 6978	LIN	20 52 35.4347594760	-05 42 40.047186780		14.22		12.67		~	91	0
165	Z 374-28	LIN	20 55 27.6255622104	-01 13 30.895126896		14.5				~	79	0
166	NGC 7025	LIN	21 07 47.3404766136	+16 20 09.224408688		14.10				~	82	0
167	Z 449-16	LIN	21 18 35.4033052152	+19 43 07.475332980		15.1				~	51	0
168	MCG-01-54-016	AG?	21 25 59.802	-03 48 35.50		15				~	67	0
169	Z 402-16	AG?	21 42 12.79	+05 36 55.1		15.6				~	43	0
170	NGC 7194	GiG	22 03 30.9364457736	+12 38 12.415007364		14.5				~	63	0
171	NGC 7236	LIN	22 14 44.9886363216	+13 50 47.450963760		14.3	14.3			~	286	1
172	Z 377-45	EmG	22 18 52.962	-01 03 31.21		15.70				~	58	0
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178	Z 405-12	AG?	22 52 38.3367927576	+06 05 37.218158628		15.30				~	89	0
179	NGC 7436	GiG	22 57 57.5438666496	+26 08 59.953374888						~	93	0
180	Z 475-11	LIN	22 58 19.5950652792	+26 03 42.926040252		15.4				~	47	0
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182	NGC 7466	AGN	23 02 03.4724376888	+27 03 09.223962084		15.27	14.42			~	108	0
183	NGC 7489	AG?	23 07 32.6813971224	+22 59 52.998974304		14.3				~	99	0
184	NGC 7549	GiG	23 15 17.285	+19 02 29.92		14.1		12.79		~	133	0
185	NGC 7563	LIN	23 15 55.9242198192	+13 11 46.060536984	14.48	13.87	12.81			~	83	1
186	NGC 7562	GiP	23 15 57.4982037648	+06 41 15.227839176		13.0				~	173	0
187	NGC 7591	SyG	23 18 16.2727927344	+06 35 09.108933504		13.8				~	285	1
188	Z 454-40	GiG	23 20 02.7842827632	+15 57 10.025218404		14.3				~	84	0
189	Z 406-71	GiP	23 20 12.781	+07 55 55.62		15.7				~	66	0
190	NGC 7625	AG?	23 20 30.132	+17 13 32.16	13.31	13.23	11.98	11.25		~	280	0
191	NGC 7631	GiG	23 21 26.6685629592	+08 13 03.560510496		13.8				~	160	0
192	NGC 7653	LIN	23 24 49.3605599784	+15 16 32.129440788		12.06	11.91			~	118	1
193	NGC 7671	GiP	23 27 19.3401587400	+12 28 02.728494624		14.3				~	71	0
194	NGC 7683	GiG	23 29 03.8180030520	+11 26 42.645888420		14.60				~	66	0
195	Z 407-17	AG?	23 35 26.111	+07 19 19.69		14.40				~	72	0
196	NGC 7716	AG?	23 36 31.4564531712	+00 17 50.183061252		12.9		13.0	12.6	~	180	0
197	NGC 7738	LIN	23 44 02.0233516093	+00 30 59.758852365		14.4				~	112	1
198	Z 381-56	LSB	23 51 50.6809891488	+03 04 57.754612308		15.0				~	73	0
199	NGC 7783	Sy1	23 54 10.0832434104	+00 22 58.249758684		14.14		12.43		~	78	0
200	Z 498-45	AG?	23 57 23.994	+30 59 31.79		14.70				~	88	0
201	MCG-01-01-012	Sy1	23 59 10.788	-04 11 30.52		14.5				~	41	0
202	NGC 7800	LSB	23 59 36.306	+14 48 20.06		13.4				~	105	0

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