AAVSO: Solar Bulletin May, 2001

Solar Bulletin
THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS - SOLAR DIVISION
Carl E. Feehrer, Editor 9 Gleason Rd. Bedford, MA 01730	Email: cfeehrer@hotmail.com ISSN 0271-8480

Volume 57 Number 5	May 2001

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

Table II. April Observers

Day	N	Raw	s.d.	K-corrected	s.d.	s.e.
1	42	148	6.9	123	4.6	0.71
2	39	152	6.5	127	3.8	0.61
3	40	155	8.1	128	6.1	0.96
4	36	173	7.8	140	4.7	0.78
5	37	153	7.3	125	5.3	0.87
6	37	117	5.5	94	3.7	0.61
7	42	94	3.8	77	2.9	0.45
8	39	75	2.2	62	1.4	0.22
9	40	80	3.2	64	1.9	0.30
10	44	81	2.6	66	1.7	0.26
11	43	104	3.7	86	3.5	0.53
12	48	114	4.4	92	3.6	0.52
13	44	121	5.0	94	4.5	0.68
14	42	130	7.3	107	4.6	0.71
15	40	131	7.4	103	4.9	0.77
16	38	129	6.4	103	4.8	0.78
17	33	127	5.4	105	3.2	0.56
18	33	123	6.8	101	5.7	0.99
19	39	113	4.8	90	3.3	0.53
20	39	104	4.5	85	2.8	0.45
21	28	127	4.3	101	2.8	0.53
22	35	157	5.9	131	3.2	0.54
23	37	161	7.3	132	4.8	0.79
24	35	157	8.0	128	5.1	0.86
25	35	142	6.2	113	3.8	0.64
26	35	156	9.1	125	5.4	0.91
27	25	142	8.3	113	5.5	1.10
28	29	132	6.3	106	4.4	0.82
29	43	105	5.0	86	4.2	0.64
30	39	88	3.2	72	2.2	0.35
31	38	87	4.5	72	3.4	0.55
Means:		125.0		101.6
No. of Observations: 1174 No. of Observers: 69

Reporting Addresses

Sunspot Reports -- email: solar@aavso.org: postal mail: AAVSO, 25 Birch St. Cambridge, MA 02138; FAX (AAVSO): (617) 354-0665
SES Reports -- email: noatak@aol.com: postal mail: Mike Hill 114 Prospect St. Marlboro, MA 01752
Magnetometer Reports -- email: capaavso@aol.com: postal mail: Casper Hossfield PO Box 23, New Milford, NY 10959; FAX: (973) 853-2588 or (407) 482-3963

3	ANDE	E.Anderson
5	ATON	A.Attanasio
10	BARH	H.Barnes
15	BATR	R.Battaiola
17	BEB	R.Berg
8	BEDJ	J.Bedient
17	BEGM	M.Begbie
5	BERJ	J.Berdejo
14	BLAJ	J.Blackwell
17	BMF	M.Boschat
27	BOSB	B.Bose
29	BRAB	B.Branchett
27	BRAR	R.Branch
30	BROB	R.Brown
11	CAMP	P.Campbell
20	CARJ	J.Carlson
29	CKB	B.Cudnik
8	CLZ	L.Corp
18	COMT	T.Compton
10	DEMF	F.Dempsey
18	DRAJ	J.Dragesco
25	DUBF	F.Dubois
28	ELR	E.Reed
17	FEEC	C.Feehrer
26	FLET	T.Fleming
22	FUJK	K.Fujimori
24	GIOR	R.Giovanoni
10	GOTS	S.Gottschalk
9	HAYK	K.Hay
10	IMPR	R.Imperi
25	JAMD	D.James
15	JEFT	T.Jeffrey
15	JENJ	J.Jenkins
5	JENS	S.Jenner
20	KAPJ	J.Kaplan
27	KHAR	R.Khan
21	KNJS	J&S Knight
2	KUZM	M.Kuzmin
12	LARJ	J.Larriba
18	LERM	M.Lerman
20	LEVM	M.Leventhal
23	LIZT	T.Lizak
23	MALK	K.Malde
13	MARE	E.Mariani
20	MCE	E.Mochizuki
9	MILJ	J.Miller
18	MMI	M.Moeller
10	MUDG	G.Mudry
21	OBSO	IPS Obs.
22	RICE	E.Richardson
8	RITA	A.Ritchie
27	SCGL	G.Schott
17	SCHG	G.Scholl
9	SIMC	C.Simpson
9	STEF	G.Stefanopoulis
24	STEM	G.Stemmler
16	STQ	N.Stoikidis
21	SUZM	M.Suzuki
5	SZAD	D.Szady
18	SZAK	K.Szatkowski
23	SZUM	M.Szulc
26	TESD	D.Teske
13	THR	R.Thompson
19	VALD	D.del Valle
18	VARG	A.Vargas
13	VIDD	D.Vidican
19	WILW	W.Wilson
11	WITL	L.Witkowski
30	YESH	H.Yesilyaprak

Table III. Means of Raw Group Counts (RG) and Ratios of Spots to Groups (S:G) in May 2001
Day	RG	S:G	Day	RG	S:G	Day	RG	S:G	Day	RG	S:G
1	8.0	8.5	9	5.9	3.6	17	7.1	7.9	25	8.5	6.7
2	8.2	8.5	10	5.9	3.7	18	7.5	6.4	26	10.3	5.1
3	8.1	9.1	11	6.5	6.0	19	7.6	4.9	27	9.8	4.5
4	8.3	10.8	12	5.9	9.3	20	7.1	4.6	28	9.1	4.5
5	8.5	8.0	13	5.8	10.9	21	8.4	5.1	29	7.5	4.0
6	7.3	6.0	14	6.2	11.0	22	10.1	5.5	30	6.4	3.8
7	6.8	3.8	15	6.4	10.5	23	9.7	6.6	31	6.4	3.6
8	5.7	3.2	16	6.7	9.3	24	8.7	8.0	Mn.	7.6	6.6

Click image to enlarge.
Fig.1 Comparison of Ri (provisional) and Ra estimates for May.
(Ri Source: http://sidc..oma.be/index.php3)

Smoothed Mean Sunspot Number (Rsm) for November 2000: 118.2

Click image to enlarge.
Fig.2 Monthly Ra and Smoothed Mean Sunspot Numbers (Waldmeier method).

Editor's Notes

New Reporting Software
Version 1 of the new reporting software is now available on the AAVSO/Solar Division website. Observers may find this software easier to use than the old DOS-based SUNKEY program or its text-based equivalent , both of which have been on the website for some time. Called SolObs and written by Len Abbey, the program incorporates the SPOTPLOT program authored earlier by Joseph Lawrence, which may be particularly useful to those who project the sun's image. Len and I would be pleased to receive comments from observers who try the program.

New Contributors
I am pleased to acknowledge the contributions of three new observers this month. Paul Campbell (A100, CAMP) from Edmonton, Alberta, who has been sending sunspot reports for several months, has contributed his first SID report. Mikhail Kuzmin (KUZM), an experienced observer in Moscow, and Daryl Szady (SZAD) of Brewer, Maine, have sent their initial reports. Thank you all for your work and for helping the Solar Division grow!

Clear Skies
CEF

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