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Solar Bulletin, August 2004

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 60 Number 8August 2004
Table I. Mean Sunspot Numbers for August 2004
[boldface = maximum, minimum]		Table II. August Observers
Day N Raw Mean Ra
1 40 39 31
2 44 44 34
3 37 48 37
4 36 43 32
5 37 39 30
6 38 52 40
7 41 63 49
8 39 60 47
9 39 82 61
10 36 93 67
11 33 100 72
12 39 109 81
13 34 122 86
14 41 114 84
15 35 95 71
16 47 91 68
17 32 69 52
18 41 65 47
19 40 65 47
20 37 86 61
21 37 92 69
22 49 98 75
23 39 76 59
24 37 62 45
25 40 49 36
26 39 39 29
27 34 35 28
28 32 33 27
29 38 21 16
30 31 23 17
31 38 10 7
Means:38.265.148.5
No. of Observers: 64
No. of Observations: 1184

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
30 ARAG G.Araujo
16 BARH H.Barnes
11 BATR R.Battaiola
20 BEB R.Berg
9 BERJ J.Berdejo
13 BLAJ J.Blackwell
26 BMF M.Boschat
16 BOSB B.Bose
29 BRAB B.Branchett
20 BRAR R.Branch
31 BROB R.Brown
7 CAMP P.Cambell
10 CARJ J.Carlson
30 CHAG G.Morales
28 CKB B.Cudnik
15 CLZ C.Laurent
15 COMT T.Compton
17 DEJV J.van Delft
4 DELS S.Delaney
16 DGP G.Dyck
7 DPP P.dePonthiere
23 DRAJ J.Dragesco
30 DUBF F.Dubois
18 FEEC C.Feehrer
22 FERJ J.Fernandes
24 FLET T.Fleming
25 FUJK K.Fujimori
17 GOEM M.Goetz
10 HALB B.Halls
13 HAYK K.Hay
19 HRUT T.Hrutkay
25 KAPJ J.Kaplan
29 KNJS J&S Knight
6 KQR R.Kinne
7 KROL L.Krozel
4 LARJ J.Larriba
12 LERM M.Lerman
24 LEVM M.Leventhal
21 MARE E.Mariani
25 MARJ J.Maranon
21 MAV D.Matsnev
22 MCE E.Mochizuki
17 MMI M.Moeller
18 OBSO IPS Observatory
16 RICE E.Richardson
10 RITA A.Ritchie
29 SCGL G.Schott
11 SCHG G.Scholl
1 SDP D.Sharples
24 STEF G.Stefanopoulis
26 STEM G.Stemmler
29 STQ N.Stoikidis
24 SUZM M.Suzuki
27 SZUM M.Szulc
28 TESD D.Teske
17 THR R.Thompson
21 TJV J.Temprano
24 URBP P.Urbanski
18 VARG A.Vargas
9 VELM M.Velea
21 WILW W.Wilson
25 YESH H.Yesilyaprak

Table III. Means of Raw Group Counts (RG) and Ratios of Spots to Groups (S:G) in August 2004
Day RG S:G Day RG S:G Day RG S:G Day RG S:G
1 2.3 7.4 9 4.0 10.6 17 3.0 13.3 25 3.2 5.2
2 2.2 9.8 10 4.4 11.1 18 3.5 8.8 26 2.4 6.1
3 2.1 12.6 11 4.0 14.9 19 3.9 6.6 27 2.5 3.9
4 1.8 14.1 12 4.2 15.8 20 4.8 8.1 28 2.6 2.7
5 1.5 16.4 13 4.6 16.3 21 4.6 10.1 29 1.8 1.8
6 2.7 9.1 14 4.3 16.2 22 5.2 8.9 30 1.5 5.0
7 3.7 6.8 15 3.7 16.1 23 4.5 7.0 31 0.8 2.5
8 3.3 7.9 16 3.3 17.1 24 3.7 6.8 Mn. 3.2 9.6

Figure 1
Click image to enlarge.
Fig. 1. 10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for August 2004
(10cm Source: http://www.drao.nrc.ca/icarus)

Figure 2
Click image to enlarge.
Fig.2 Smoothed Mean Sunspot Numbers (Waldmeier method) from January 2000 to February 2004.

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

Sudden Ionospheric Disturbances (SID) Recorded During August 2004

(Analysis performed by Michael Hill, SID Analyst)
Date Max Imp Date Max Imp Date Max Imp
040808 1704 2+ 040813 1739 2 040816 1338 2
040808 1710 1- 040813 1814 2 040817 0744 2+
040808 1725 2 040813 2001 1 040817 0841 2+
040809 0736 1+ 040814 0415 2+ 040817 0859 1-
040809 0808 1 040814 0545 2 040817 1000 1+
040809 0840 1- 040814 0552 2+ 040817 1333 2+
040809 1108 1- 040814 0756 1 040817 1338 2
040809 1335 1 040814 0803 3+ 040817 1807 2+
040810 1154 1- 040814 0931 1- 040817 1933 2+
040810 1447 2+ 040814 0938 2+ 040817 2119 2+
040810 1756 1+ 040814 1001 1 040817 2124 2
040811 0825 1- 040814 1211 2 040818 0847 1
040811 0854 1 040814 1342 2 040818 1047 1-
040811 1016 1+ 040814 1523 1+ 040818 1355 1+
040811 1142 1+ 040814 1637 1+ 040818 1627 1-
040812 0508 1- 040814 1647 1+ 040818 1645 1+
040812 0935 1- 040814 1745 1+ 040818 1734 2
040812 0948 1+ 040814 1819 2 040818 1747 2+
040812 1143 1+ 040814 2019 2 040818 1758 3
040812 1301 1- 040815 0505 2 040819 0659 2
040812 1622 1+ 040815 0600 1 040819 1151 1-
040812 1822 1+ 040815 1130 1+ 040819 1239 1-
040813 0726 1+ 040815 1139 2 040819 1305 1+
040813 0734 2 040815 1238 2 040819 1339 2+
040813 0946 1 040815 1651 1 040819 1347 2+
040813 1210 1 040815 1846 2 040826 0217 1
040813 1327 1- 040815 2045 1+      
040813 1518 1+ 040816 1026 2      


Importance rating: Duration -1: <191: 19-251+: 26-322: 33-452+: 46-853: 86-1253+: >125

Observer Code Station(s) monitored
A Clerkin A29 NAA
J Winkler A50 NAA NML NPM
D Toldo A52 NAA VTX
J Ellerbe A63 ICV
P King A80 HWU
W Moos A84 FTA
M Hill A87 NAA
J Mandaville A90 NPM
G DiFillipo A93 DHO HWU
T Poulos A95 NAA
J Wallace A97 NAA
M King A99 HWU
P Campbell A100 NLK
G Bressan A101 HWU
F Steyn A102 NAA
B Bose A103 VTX
L Observatory A107 DHO
The events listed above meet at least one of the following criteria
  1. Event reported by two or more observers within +/- 5 minutes
  2. Event matched to GOES-8 XRA event to within +/- 15 minutes and event time < 1000 UT
  3. Reported by observer with a high quality rating > 8 (scale 1-10)

SID ratings

Solar Events

August was another busy month for flare activity. There were quite a number of powerful flares resulting in a good deal of SID activity, especially during the middle of the month. There were 82 correlated SID events this month. All of them had an importance rating below 2+ however. There were 238 X-Ray flares recorded by the GOES-12 spacecraft. Of these, 2 were X-Class and 26 were M-Class flares. This would explain why most were of a lower importance rating. Still a busy month however. This month is looking to be mildly busy but as I write this I am anxiously awaiting the arrival of possible auroral activity which is something else that does not occur too often as we approach solar minimum. Looks like a late night for me. Thanks to all of you who reported your data in the correct format, per my request. And thanks to those of you working with me to come into compliance.

Solar Flare Summary
 
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