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Solar Bulletin, October 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 10October 2004

Table I. Mean Sunspot Numbers for October 2004
[boldface = maximum, minimum]
Table II. October Observers
Day N Raw Mean Ra
1 41 28 21
2 37 25 19
3 38 40 30
4 37 37 29
5 34 30 23
6 35 27 21
7 38 29 22
8 27 19 13
9 31 8 6
10 40 1 1
11 34 2 1
12 33 15 11
13 28 25 18
14 25 23 16
15 22 24 16
16 22 36 26
17 25 65 46
18 26 72 56
19 15 82 64
20 24 91 70
21 27 100 71
22 28 113 83
23 29 119 87
24 29 131 101
25 30 134 99
26 24 137 100
27 25 136 104
28 29 135 100
29 30 125 93
30 26 134 97
31 32 134 97
Means:29.767.049.7
No. of Observers: 62
No. of Observations: 921

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
11 AAP P.Abbott
28 ARAG G.Araujo
8 ARE R.Allessi
9 BARH H.Barnes
1 BATR R.Battaiola
5 BEB R.Berg
10 BERJ J.Berdejo
7 BLAJ J.Blackwell
15 BMF M.Boschat
14 BOSB B.Bose
26 BRAB B.Branchett
25 BRAR R.Branch
25 BROB R.Brown
4 CAMP P.Cambell
30 CHAG G.Morales
28 CKB B.Cudnik
8 CLZ C.Laurent
13 COMT T.Compton
29 CR T.Cragg
20 DEJV J.van Delft
5 DELS S.Delaney
3 DEMF F.Dempsey
12 DGP G.Dyck
9 DPP P.dePonthiere
11 DRAJ J.Dragesco
22 DUBF F.Dubois
3 FEEC C.Feehrer
18 FERJ J.Fernandez
26 FLET T.Fleming
19 FUJK K.Fujimori
5 GOEM M.Goetz
4 HAYK K.Hay
10 HRUT T.Hrutkay
17 JAMD D.James
7 JEFT T.Jeffrey
15 KAPJ J.Kaplan
23 KNJS J&S Knight
4 KROL L.Krozel
9 LARJ J.Larriba
6 LERM M.Lerman
19 LEVM M.Leventhal
6 MARE E.Mariani
26 MARJ J.Maranon
15 MCE E.Mochizuki
12 MEU E.Mason
22 MMI M.Moeller
7 OBSO IPS Observatory
14 RICE E.Richardson
20 RITA A.Ritchie
20 SCGL G.Schott
2 SDP D.Sharples
20 STEM G.Stemmler
23 STQ N.Stoikidis
20 SUZM M.Suzuki
20 SZUM M.Szulc
26 TESD D.Teske
14 THR R.Thompson
20 TJV J.Temprano
20 URBP P.Urbanski
18 VARG A.Vargas
7 VELM M.Velea
26 YESH H.Yesilyaprak

Table III. Means of Raw Group Counts (RG) and Ratios of Spots to Groups (S:G) in October 2004
Day RG S:G Day RG S:G Day RG S:G Day RG S:G
1 2.4 1.7 9 0.6 3.3 17 3.5 8.6 25 6.8 9.7
2 2.0 2.5 10 0.1 0 18 4.5 6.0 26 7.2 9.0
3 2.8 4.3 11 0.1 10.0 19 5.5 4.9 27 7.8 7.4
4 2.6 4.2 12 1.2 2.5 20 5.4 6.9 28 7.8 7.3
5 2.3 3.0 13 1.7 4.7 21 6.3 5.9 29 7.2 7.4
6 2.3 1.7 14 1.3 7.7 22 6.5 7.4 30 7.8 7.2
7 2.2 3.2 15 1.2 10.0 23 6.8 7.5 31 6.8 9.7
8 1.4 3.6 16 1.7 11.2 24 6.9 9.0 Mn. 4.0 6.0

Figure 1
Click image to enlarge.
Fig. 1. 10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for October 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 April 2004.


Summary of AAVSO Solar Committee Activity for the Period
October 2003 to September 2004

Committee Chair and Sunspot Observing Group Leader: Carl E. Feehrer
Solar Flare/SID Observing Group Leader: Mike Hill

Contributions by both sunspot and SID observers to the work of the Solar Committee continued at strong levels during the period. Eleven thousand, one hundred and sixty-five observations were made by a group of 78 sunspot observers, and a total of 242 reports was contributed by a group of 24 SID observers. Three new sunspot observers were added to the ranks.

Observer Awards
We are pleased this year to be able to recognize formally the contributions of observers who have made sustained contributions to our work. The international flavor of the group of observers identified below provides some indication of the breadth of support that continues to be enjoyed by the Committee, and certificates recognizing the accomplishments of these observers will be mailed shortly.

Sunspot Observers In 1999, the AAVSO's Director and Joseph Lawrence, then chair of the Solar Division, initiated a program aimed at formally recognizing observers who had made sustained contributions to the program. Criteria for award of a certificate acknowledging such contributions at increments of 1500 observations were established at that time, and recognition was to be given at the Fall meeting each year.

Five observers have now met or exceeded the initial (1500 observations) criterion. They are:

Robert Branch (BRAR) United States
Brenda Branchett (BRAB) United States
Thomas Cragg (CR) Australia
German Morales Chavez (CHAG) Bolivia
Javier Jarboles Maranon (MARJ) Spain

SID Observers Beginning this year, formal recognition of the sustained contributions of particular SID observers will also be given. To receive this award, an observer must submit reports for a period of 40 months, an average of 10 months over a period of four years. As with the sunspot program, recognition of the accomplishments of qualifying observers will be given at the time of the Fall meeting.

Nine observers have now met or exceeded the criterion. Their names are as follows:

Jerry Winkler (A50) United States
Danny Overbeek (A52; awarded posthumously) South Africa
Dominic Toldo (A52) South Africa
James Ellerbe (A63) Spain
Alex Panzer (A83) United States
Walter Moos (A84) Switzerland
Michael Hill (A87) United States
Michael King (A90) United Kingdom
Guglielmo DiFillipo (A93) Italy

Website Activity
Activity with respect to the website's solar pages continues high. A total of 74,670 downloads of the various pages in the solar section of the website were requested. This total includes requests for volumes 59 (no.s 10-12) and 60 (no.s 1-9) of the Solar Bulletin, which totaled 2,508 for the period

Software Development
New sunspot analysis software consistent with the latest Windows operating systems has been completed. The software includes several new diagnostic features that advise the user of such things as non-conforming data formats and file names, incorrect observer IDs, incorrect dates, and other reporting deficiencies that complicate the monthly task of preparing the sunspot portion of the Solar Bulletin.

Acknowledgements
The successful performance of the Committee's work is due to the dedication and active support of an international cadre of observers, the AAVSO's staff, and Arthur Ritchie, a volunteer who assists in the preparation of the monthly sunspot data at the AAVSO's headquarters. A grateful "Thank you" goes out to all those who have aided in the our work during the year.


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

Sudden Ionospheric Disturbances (SID) Recorded During October 2004

(Analysis performed by Michael Hill, SID Analyst)
Date Max Imp Date Max Imp Date Max Imp
041004 1327 2+ 041028 0317 1+ 041030 1448 1
041009 1115 2 041028 0354 1 041030 1555 1-
041016 1803 1- 041028 0427 2 041030 1625 2
041019 1428 1 041028 0608 1+ 041030 1631 2
041020 0215 1- 041029 0000 2 041030 2159 2
041020 1052 1 041029 1244 1-      
041021 1445 1 041029 1437 1-      
041021 1522 1+ 041029 1633 1-      
041021 1948 2+ 041029 1924 1-      
041022 0805 2 041030 0049 1+      
041022 0812 1+ 041030 0335 1+      
041022 2215 2 041030 0417 1      
041023 0402 1+ 041030 0459 1      
041023 0726 1 041030 0557 1-      
041023 1638 1 041030 0619 1+      
041023 1654 3 041030 0703 1+      
041023 1922 1+ 041030 0900 1-      
041024 0711 2 041030 0920 1-      
041024 1825 1+ 041030 0929 1+      
041024 2026 2+ 041030 1036 1+      
041025 0716 1- 041030 1146 1+      
041025 1010 1- 041030 1157 1-      
041025 1031 1 041030 1254 1      
041025 1445 1+ 041030 1349 1-      
041026 1507 1 041030 1405 1-      


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 NWC VTX
J Ellerbe A63 ICV
P King A80 FTA
M Hill A87 NAA
J Mandaville A90 NPM
G DiFillipo A93 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
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

October started off very slowly but ended with quite a bit of activity. This can be seen quite visually in the graph below and is evident in the number of SID events detected by observers. There were 60 correlated SID events this month. Many of them had a low importance rataing, with a few stronger events. There were 224 X-Ray flares detected by the GOES satellite. Of these, 9 were M-Class events and one, on the 30th of the month, was an X-Class event.

One of our members, Steve Hansen (A59) has a number of Rustrak strip chart recorders. Even though the AAVSO SID program does not promote the use of these for monitoring since it can no longer supply the paper rolls, some of you might still have an interest in these for experimenting or for spare parts. If you do, then I suggest you contact Steve and see what he has available. His email address is shansen(at)tiac.net (email address purposely modified)

Solar Flare Summary
 
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