AAVSO: Solar Bulletin, August 2005

Solar Bulletin, August 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 8

August 2005

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

Table II. August Observers

Day	N	Raw Mean	Ra
1	38	89	68
2	40	91	67
3	41	70	51
4	35	66	51
5	42	63	47
6	41	53	40
7	39	57	43
8	42	55	42
9	31	49	36
10	37	27	21
11	31	29	22
12	33	33	25
13	29	28	20
14	36	37	27
15	35	38	28
16	38	33	25
17	39	27	20
18	39	32	25
19	37	63	46
20	37	65	45
21	39	63	47
22	38	55	41
23	31	59	44
24	41	56	42
25	32	61	45
26	29	55	41
27	31	67	51
28	40	62	47
29	36	59	45
30	31	45	34
31	29	38	28
Means:	36.0	52.4	39.2
No. of Observers: 60 No. of Observations: 1117

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

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

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

Click image to enlarge.
Fig. 1. 10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for August 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 February 2005.

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

Sudden Ionospheric Disturbances (SID) Recorded During August 2005

(Analysis performed by Michael Hill, SID Analyst)
Date	Max	Imp	Date	Max	Imp
050801	1222	1+	050831	1619	2
050801	1333	1
050801	1349	2+
050802	0746	2
050802	1247	2+
050802	1831	2
050802	2017	1+
050803	0507	1+
050803	1357	2
050803	1405	2
050803	2107	1
050804	0559	2
050804	0610	2+
050821	1020	2
050822	0114	2+
050823	1431	2+
050823	1437	1+
050823	1445	2+
050823	2206	1
050824	0621	1-
050824	0640	1
050824	0706	1+
050825	0442	1+
050828	1026	2
050829	2155	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 NAU
J Winkler	A50	NAA NML NPM
D Toldo	A52	NWC XXX
J Ellerbe	A63	ICV
M Hill	A87	NAA
J Mandaville	A90	NPM
L Anderson	A91	NWC
G Di Filippo	A93	DHO HWU
T Poulos	A95	NAA
R Battaiola	A96	HWU
J Wallace	A97	NAA
M King	A99	HWU
P Campbell	A100	NLK
G Bressan	A101	HWU
F Steyn	A102	NAA NWC
L Observatory	A107	DHO
P Mortfield	A108	NAA
T Bjorndahl	A116	NML

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

August was a fairly slow month for SID's. There were only 26 correlated SID events reported by observers and the GOES-12 X-Ray event count was also fairly low. There were 160 X-Ray events. Of these, eight were M-Class events and none were X-Class events.The first half of the month was very slow with a slight rise in activity towards the latter half. Thanks to all of you who submitted reports this month. Your data, as always, is appreciated. I'd like to welcome a new observer, Trent Bjorndahl from Edmonton, Canada. Trent is observer A116 and has just submitted his first report this month.

As I'm sure you will have noticed I have a new format for this report. I have changed the location of the various components so that there will be room for easy expansion in the future without a major disruption to the basic page format in cases where there are more than 75 SID events to report and/or the number of observers increases substantially. The first case will become an issue in a couple of years when we start rising back up to Solar Maximum and the second condition could become an issue anytime depending on the number of observers that submit data. My previous space allotment for the observer list was such that any more than 16 observers had me struggling to get all the names into one logical location. Now I can easily put in up to 28 names and still keep them all on one page.

Solar Flare Summary Based on GOES-12 Data

SID ratings

Solar Bulletin, August 2005

Solar Bulletin

Sudden Ionospheric Disturbance Report

Solar Events