AAVSO: Solar Bulletin, September 2005

Solar Bulletin, September 2005

Solar Bulletin

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS - SOLAR COMMITTEE

Carl E. Feehrer, Editor
9 Gleason Rd.
Bedford, MA 01730

Email: cfeehrer@hotmail.com

ISSN 0271-8480

Volume 61 Number 9

September 2005

Table I. Mean Sunspot Numbers for September 2005
[boldface = maximum, minimum]

Table II. September Observers

Day	N	Raw Mean	Ra
1	40	23	18
2	40	20	15
3	32	14	11
4	39	13	10
5	35	13	10
6	35	11	8
7	33	16	13
8	32	30	23
9	31	43	32
10	34	53	39
11	34	57	44
12	38	70	49
13	38	72	51
14	38	64	47
15	36	58	42
16	27	55	39
17	34	58	41
18	39	52	38
19	42	37	26
20	37	24	18
21	42	22	17
22	36	23	18
23	35	27	19
24	34	23	18
25	25	25	19
26	28	29	21
27	38	25	19
28	34	22	17
29	32	21	16
30	34	9	7
31	---	---	---
Means:	35.1	33.6	24.8
No. of Observers: 59 No. of Observations: 1052

Reporting Addresses
Sunspot Reports -- email: solar@aavso.org postal mail: AAVSO, 25 Birch St. Cambridge, MA 02138 FAX (AAVSO): (617) 354-0665
SID Solar Flare Reports -- email: noatak@aol.com postal mail: Mike Hill 114 Prospect St. Marlboro, MA 01752

15	AAP	P.Abbott
12	AJV	A.Santiago
27	ARAG	G.Araujo
2	ARE	R.Allessi
8	BARH	H.Barnes
6	BATR	R.Battaiola
18	BEB	Ray Berg
15	BERJ	J.Berdejo
11	BLAJ	J.Blackwell
26	BMF	M.Boschat
6	BOSB	B.Bose
26	BRAB	B.Branchett
4	BRAM	M.Bradbury
30	BRAR	R.Branch
26	BROB	R.Brown
30	CHAG	G.Morales
29	CKB	B.Cudnik
14	CLZ	L.Corp
20	COMT	T.Compton
27	CR	T.Cragg
8	FEEC	C.Feehrer
26	FERJ	J.Fernandez
22	FUJK	K.Fujimori
8	GOEM	M.Goetz
9	HALB	B.Halls
14	HAYK	K.Hay
11	HRUT	T.Hrutkay
17	JAMD	D.James
16	JENJ	J.Jenkins
20	KAPJ	J.Kaplan
26	KNJS	J.Knight
3	KROL	L.Krozel
11	LARJ	J.Larriba
17	LERM	M.Lerman
12	MARE	E.Mariani
22	MARJ	J.Maranon
23	MCE	E.Mochizuki
16	MENM	M.Menegotto
3	MEU	M.Mason
27	MMI	M.Moeller
29	OATS	S.Oatney
20	OBSO	IPS Observatory
26	PEKT	R.Pektas
11	RICE	E.Richardson
16	RIDC	C.Ridgway
21	RITA	A.Ritchie
28	SCGL	G.Schott
15	SCHG	G.Scholl
15	SIMC	C.Simpson
22	STEM	G.Stemmler
24	STQ	N.Stoikidis
21	SUZM	M.Suzuki
28	TESD	D.Teske
15	THR	R.Thompson
19	TJV	J.Temprano
21	URBP	P.Urbanski
18	VARG	A.Vargas
15	VIDD	D.Vidican
25	WILW	W.Wilson

Table III. Means of Raw Group Counts (RG) and Ratios of Spots to Groups (S:G) in September 2005

Click image to enlarge.
Fig. 1. 10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for September 2005
(10cm Source: http://www.drao.nrc.ca/icarus)

Click image to enlarge.
Fig.2 Smoothed Mean Sunspot Numbers (Waldmeier method) from January 2000 to March 2005.

Michael Hill, SID Analyst
114 Prospect St
Marlborough, MA 01752 USA
noatak@aol.com

Sudden Ionospheric Disturbances (SID) Recorded During September 2005

(Analysis performed by Michael Hill, SID Analyst)
Date	Max	Imp	Date	Max	Imp	Date	Max	Imp
050905	1002	2	050909	1544	1	050914	0704	2
050905	1017	2+	050909	1748	2	050914	0814	2
050907	1004	1	050909	1927	2	050914	0913	2
050907	1123	1+	050909	1945	2+	050914	1036	2
050907	1243	2	050910	0442	2	050914	1258	1+
050907	1427	1-	050910	0616	2	050914	1928	1
050907	1531	1+	050910	0651	1+	050915	0120	2
050907	1734	3	050910	0834	2	050915	0213	1-
050907	1739	3	050910	0907	1+	050915	0501	1-
050908	0851	1	050910	1029	1	050915	0656	1-
050908	1119	1+	050910	1552	1	050915	0839	2
050908	1232	2	050910	1644	1+	050915	0846	2
050908	1303	1	050910	1921	2	050915	1042	1-
050908	1439	1	050910	1932	2	050915	1449	1-
050908	1457	1-	050910	2107	1+	050915	1517	1+
050908	1608	1+	050910	2156	2+	050915	1638	1
050908	1702	1+	050911	0234	1+	050916	0150	1+
050908	1751	1	050911	0620	1+	050916	0524	1-
050908	2031	1	050911	0714	1	050916	0859	1+
050908	2106	2+	050911	1034	2	050916	1447	1
050909	0220	2+	050911	1259	1+	050916	1516	1+
050909	0300	2+	050911	2042	2	050916	1527	1
050909	0457	2+	050912	0703	1	050916	1749	2+
050909	0544	2+	050912	0848	3	050916	1936	2
050909	0550	2+	050912	0900	2	050917	0442	1+
050909	0828	1	050912	2009	1-	050917	0607	2
050909	0838	1-	050913	0445	2	050917	0941	1-
050909	0918	2	050913	0830	1	050917	1038	1
050909	0931	1-	050913	1052	1+	050917	1505	1-
050909	0950	3	050913	1125	2	050918	0436	1
050909	0959	2	050913	1930	1	050918	0503	2
050909	1249	2	050914	0421	1	050921	0903	1-
050909	1528	1-	050914	0637	1+	050923	0600	2

Importance rating: Duration

-1: <19

1: 19-25

1+: 26-32

2: 33-45

2+: 46-85

3: 86-125

3+: >125

Observer	Code	Station(s) monitored
A Clerkin	A29	NAA
D Toldo	A52	NWC XXX
J Ellerbe	A63	DHO
P King	A80	FTA
M Hill	A87	NAA
J Mandaville	A90	NPM
L Anderson	A91	NWC
G Di Filippo	A93	DHO
T Poulos	A95	NAA
R Battaiola	A96	HWU
F Steyn	A102	NAA NWC
L Observatory	A107	DHO
P Mortfield	A108	NAA

The events listed above meet at least one of the following criteria

Event reported by two or more observers within +/- 5 minutes
Event matched to GOES-8 XRA event to within +/- 15 minutes and event time < 1000 UT
Reported by observer with a high quality rating > 8 (scale 1-10)

Solar Events

September turned out to be quite a different month than last. We were treated to a very active period in the midst of approaching solar minimum complete with multiple X Class flares and a weekend at mid-month that featured beautiful auroras for some of us. There were 99 correlated SID events reported by observers this month, one of the highest numbers I have seen. Most had a low to medium importance rating but there were a good number in the upper end as well.

Interestingly there were only 164 X-Ray flares recorded by the GOES-12 Satellite. But of these, 10 were X-Class flares, 26 were M-Class flares and based on our recordings quite a few of the C-Class flares were probably in the upper end of that classification. This very active period was due primarily to one sunspot group, NOAA region 808, which was actually the return of a previous group from the month before. Thanks again to all of you for submitting your data.

Solar Flare Summary Based on GOES-12 Data

SID ratings

Solar Bulletin, September 2005

Solar Bulletin

Sudden Ionospheric Disturbance Report

Solar Events