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Solar Bulletin, September 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 |
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| Volume 60 Number 9 | September 2004 |
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Table I. Mean Sunspot Numbers for September 2004
[boldface = maximum, minimum] | Table II. September Observers
|
| Day |
N |
Raw Mean |
Ra |
| 1 |
47 |
16 |
12 |
| 2 |
38 |
16 |
12 |
| 3 |
41 |
27 |
21 |
| 4 |
41 |
33 |
26 |
| 5 |
37 |
50 |
39 |
| 6 |
41 |
54 |
40 |
| 7 |
42 |
70 |
51 |
| 8 |
34 |
71 |
52 |
| 9 |
34 |
82 |
60 |
| 10 |
39 |
72 |
55 |
| 11 |
34 |
63 |
47 |
| 12 |
43 |
64 |
49 |
| 13 |
44 |
69 |
49 |
| 14 |
29 |
62 |
43 |
| 15 |
38 |
65 |
46 |
| 16 |
32 |
59 |
43 |
| 17 |
36 |
59 |
44 |
| 18 |
34 |
52 |
39 |
| 19 |
46 |
45 |
34 |
| 20 |
39 |
42 |
31 |
| 21 |
36 |
36 |
26 |
| 22 |
41 |
26 |
19 |
| 23 |
35 |
20 |
15 |
| 24 |
35 |
14 |
11 |
| 25 |
34 |
20 |
15 |
| 26 |
36 |
22 |
17 |
| 27 |
37 |
21 |
16 |
| 28 |
32 |
16 |
12 |
| 29 |
29 |
36 |
28 |
| 30 |
32 |
45 |
32 |
| 31 |
--- |
--- |
--- |
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Means: | 37.2 | 44.3 | 32.8 |
No. of Observers: 61
No. of Observations: 1116
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Reporting Addresses |
Sunspot Reports -- email: solar@aavso.org
- postal mail: AAVSO, 25 Birch St. Cambridge, MA 02138
- FAX (AAVSO): (617) 354-0665
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SID Solar Flare Reports -- email: noatak@aol.com
- postal mail: Mike Hill
114 Prospect St. Marlboro, MA 01752
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|
| 13 |
AAP |
P.Abbott |
| 30 |
ARAG |
G.Araujo |
| 9 |
BARH |
H.Barnes |
| 4 |
BATR |
R.Battaiola |
| 18 |
BEB |
R.Berg |
| 15 |
BERJ |
J.Berdejo |
| 5 |
BLAJ |
J.Blackwell |
| 21 |
BMF |
M.Boschat |
| 12 |
BOSB |
B.Bose |
| 26 |
BRAB |
B.Branchett |
| 28 |
BRAR |
R.Branch |
| 20 |
BROB |
R.Brown |
| 4 |
CAMP |
P.Cambell |
| 30 |
CHAG |
G.Morales |
| 29 |
CKB |
B.Cudnik |
| 18 |
CLZ |
C.Laurent |
| 19 |
COMT |
T.Compton |
| 26 |
CR |
T.Cragg |
| 25 |
DEJV |
J.van Delft |
| 4 |
DELS |
S.Delaney |
| 12 |
DGP |
G.Dyck |
| 10 |
DPP |
P.dePonthiere |
| 27 |
DRAJ |
J.Dragesco |
| 24 |
DUBF |
F.Dubois |
| 13 |
FEEC |
C.Feehrer |
| 26 |
FLET |
T.Fleming |
| 21 |
FUJK |
K.Fujimori |
| 12 |
GOEM |
M.Goetz |
| 9 |
HALB |
B.Halls |
| 12 |
HAYK |
K.Hay |
| 19 |
HRUT |
T.Hrutkay |
| 12 |
JAMD |
D.James |
| 22 |
KAPJ |
J.Kaplan |
| 28 |
KNJS |
J&S Knight |
| 5 |
KQR |
R.Kinne |
| 12 |
KROL |
L.Krozel |
| 9 |
LARJ |
J.Larriba |
| 17 |
LERM |
M.Lerman |
| 19 |
LEVM |
M.Leventhal |
| 15 |
MARE |
E.Mariani |
| 29 |
MARJ |
J.Maranon |
| 22 |
MCE |
E.Mochizuki |
| 5 |
MEU |
E.Mason |
| 27 |
MMI |
M.Moeller |
| 16 |
OBSO |
IPS Observatory |
| 25 |
RITA |
A.Ritchie |
| 23 |
SCGL |
G.Schott |
| 3 |
SDP |
D.Sharples |
| 15 |
SIMC |
C.Simpson |
| 19 |
STEM |
G.Stemmler |
| 26 |
STQ |
N.Stoikidis |
| 25 |
SUZM |
M.Suzuki |
| 26 |
SZUM |
M.Szulc |
| 26 |
TESD |
D.Teske |
| 24 |
THR |
R.Thompson |
| 21 |
TJV |
J.Temprano |
| 26 |
URBP |
P.Urbanski |
| 20 |
VARG |
A.Vargas |
| 7 |
VELM |
M.Velea |
| 24 |
WILW |
W.Wilson |
| 27 |
YESH |
H.Yesilyaprak |
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| Table III. Means of Raw Group Counts (RG) and Ratios of Spots to Groups (S:G) in September 2004 |
| Day |
RG |
S:G |
Day |
RG |
S:G |
Day |
RG |
S:G |
Day |
RG |
S:G |
| 1 |
1.3 |
1.9 |
9 |
4.4 |
8.7 |
17 |
2.5 |
14.0 |
25 |
1.7 |
2.2 |
| 2 |
1.3 |
2.0 |
10 |
4.0 |
7.9 |
18 |
2.4 |
11.4 |
26 |
2.0 |
1.3 |
| 3 |
2.0 |
3.4 |
11 |
3.5 |
8.1 |
19 |
2.5 |
8.5 |
27 |
1.8 |
1.4 |
| 4 |
2.3 |
4.0 |
12 |
3.3 |
9.1 |
20 |
2.2 |
9.1 |
28 |
1.4 |
1.6 |
| 5 |
3.5 |
4.2 |
13 |
2.9 |
13.6 |
21 |
2.0 |
7.9 |
29 |
3.0 |
1.9 |
| 6 |
3.3 |
6.2 |
14 |
2.0 |
20.9 |
22 |
1.4 |
9.3 |
30 |
3.7 |
2.4 |
| 7 |
3.6 |
9.5 |
15 |
2.6 |
15.1 |
23 |
1.3 |
5.2 |
31 |
--- |
--- |
| 8 |
3.3 |
11.4 |
16 |
2.3 |
15.7 |
24 |
1.2 |
2.3 |
Mn. |
2.5 |
7.3 |
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Click image to enlarge.
Fig. 1. 10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for September 2004
(10cm Source: http://www.drao.nrc.ca/icarus) |
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Click image to enlarge.
Fig.2 Smoothed Mean Sunspot Numbers (Waldmeier method) from January 2000 to March 2004. |
Michael Hill, SID Analyst
114 Prospect St
Marlborough, MA 01752 USA
noatak@aol.com |
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Sudden Ionospheric Disturbances (SID) Recorded During September 2004
| (Analysis performed by Michael Hill, SID Analyst) |
| Date |
Max |
Imp |
Date |
Max |
Imp |
Date |
Max |
Imp |
| 040907 |
2153 |
1+ |
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| 040910 |
1614 |
2 |
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| 040912 |
0026 |
1 |
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| 040912 |
0038 |
2+ |
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| 040912 |
0140 |
1 |
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| 040912 |
1836 |
1 |
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| 040913 |
2118 |
2+ |
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| 040914 |
0922 |
3 |
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| 040914 |
0930 |
3 |
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| 040914 |
1404 |
2 |
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| 040914 |
1657 |
2+ |
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| 040914 |
1930 |
2 |
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| 040915 |
1838 |
1 |
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| 040918 |
1353 |
2 |
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| 040918 |
1622 |
2+ |
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| 040918 |
1736 |
2 |
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| 040919 |
1700 |
3 |
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| 040919 |
1708 |
2+ |
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| 040921 |
0838 |
1- |
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| 040922 |
0920 |
2 |
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| 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 |
| J Winkler |
A50 |
NAA NML NPM |
| J Ellerbe |
A63 |
ICV |
| P King |
A80 |
FTA |
| W Moos |
A84 |
FTA |
| M Hill |
A87 |
NAA |
| J Mandaville |
A90 |
NPM |
| G DiFillipo |
A93 |
DHO HWU |
| T Poulos |
A95 |
NAA |
| R Battaiola |
A96 |
HWU |
| J Wallace |
A97 |
NAA |
| M King |
A99 |
HWU |
| F Steyn |
A102 |
NAA |
| P Mortfield |
A108 |
NAA |
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| 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)
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September was a very slow month for SID Monitoring. A radical change from the last two months but more in line with what is to be expected in this part of the solar cycle. There were only 20 correlated SID events recorded this month. Many were longer duration events however with importance ratings falling primarily in the 2, 2+ and 3 range. The X-Ray flare count was low as well. As can be seen from the chart below there were far fewer flares recorded last month totalling only 111. Of these, only four were M-Class events and there were no X-Class events.
The observer count fell from the usual 18-19 observers down to 16 last month. Hopefully this trend will not continue as activity decreases but I know there are those of you I can count on to continue submitting reports, even if they are are reports of non activity indicating you are still watching. Thank to all of you who have sumbitted.
This month observer awards are going to be issued to some of you for your continued efforts and dedication. The criteria for the awards has been determined by me to be the submission of data for 40 months which amounts to an average of 10/year for four years. Eight observers will receive awards this year. These awards will be given out each year for those that reach this milestone. There will certainly be more of you which will meet this criteria next year. Thanks again for all your efforts.
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