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Solar Bulletin, July 2003
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 59 Number 7 | July 2003 |
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Table I. Mean Sunspot Numbers for July 2003
[boldface = maximum, minimum] | Table II. July Observers |
| Day |
N |
Raw Mean |
Ra |
std. error |
| 1 |
42 |
136 |
102 |
2.7 |
| 2 |
46 |
117 |
86 |
3.0 |
| 3 |
41 |
99 |
75 |
3.2 |
| 4 |
46 |
95 |
70 |
2.8 |
| 5 |
48 |
79 |
58 |
2.1 |
| 6 |
49 |
88 |
65 |
2.5 |
| 7 |
39 |
108 |
83 |
2.4 |
| 8 |
46 |
134 |
96 |
1.9 |
| 9 |
41 |
124 |
90 |
2.5 |
| 10 |
38 |
96 |
73 |
2.1 |
| 11 |
43 |
86 |
64 |
2.5 |
| 12 |
40 |
94 |
68 |
2.2 |
| 13 |
44 |
131 |
100 |
2.8 |
| 14 |
45 |
135 |
102 |
2.1 |
| 15 |
37 |
143 |
107 |
4.0 |
| 16 |
44 |
130 |
99 |
2.6 |
| 17 |
47 |
158 |
111 |
2.9 |
| 18 |
46 |
156 |
119 |
3.0 |
| 19 |
47 |
182 |
135 |
4.5 |
| 20 |
47 |
221 |
162 |
4.6 |
| 21 |
46 |
201 |
143 |
4.1 |
| 22 |
47 |
161 |
116 |
3.4 |
| 23 |
44 |
129 |
100 |
3.6 |
| 24 |
47 |
103 |
76 |
2.1 |
| 25 |
50 |
54 |
39 |
1.7 |
| 26 |
45 |
38 |
28 |
1.1 |
| 27 |
47 |
41 |
30 |
1.7 |
| 28 |
48 |
65 |
49 |
1.3 |
| 29 |
44 |
60 |
46 |
1.9 |
| 30 |
50 |
61 |
44 |
1.4 |
| 31 |
46 |
58 |
43 |
1.4 |
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Means: | 44.8 | 112.4 | 83.2 | 2.6 |
No. of Observations: 1390
No. of Observers: 77
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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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|
22
26
28
12
21
13
6
12
18
17
28
9
30
8
9
17
31
23
18
21
31
28
21
28
4
26
29
28
19
21
26
19
25
7
9
8
16
25
13
3
17
16
27
1
6
15
20
7
27
31
10
7
30
8
6
22
13
22
27
7
9
31
15
19
26
15
14
17
24
29
14
7
21
15
24
30
6
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AAP
ARAG
ATON
BARH
BATR
BERJ
BLAJ
BMF
BOJP
BOSB
BRAB
BRAD
BRAR
BROB
CAMP
CARJ
CHAG
CKB
CLZ
COMT
CORA
CR
CVJ
DEJV
DELS
DRAJ
DUBF
ELR
FEEC
FERJ
FLET
FUJK
GIOR
GOEM
GOLA
HAYK
HRUT
JAMD
JEFT
JENS
KAPJ
KHAR
KNJS
KROL
LARJ
LERM
LEVM
LUBT
MALK
MARJ
MCE
MILJ
MMI
OBSO
PARN
REYD
RICE
RITA
SCGL
SCHG
SIMC
STAB
STEF
STEM
STQ
SUZM
SYP
SZAK
SZUM
TESD
THR
TJV
VARG
VIDD
WILW
YESH
ZDM
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P.Abbott
G.Araujo
A.Attanasio
H.Barnes
R.Battaiola
J.Berdejo
J.Blackwell
M.Boschat
P.Bojda
B.Bose
B.Branchett
D.Branchett
R.Branch
R.Brown
P.Campbell
J.Carlson
G.Morales
B.Cudnik
C.Laurent
T.Compton
A.Coroas
T.Cragg
J.Carvajal
J.van Delft
S.Delaney
J.Dragesco
F.DuBois
E.Reed
C.Feehrer
J.Fernandes
T.Fleming
K.Fujimori
R.Giovanoni
M.Goetz
A.Golovin
K.Hay
T.Hrutkay
D.James
T.Jeffrey
S.Jenner
J.Kaplan
R.Khan
J&S Knight
L.Krozel
J.Larriba
M.Lerman
M.Leventhal
T.Lubbers
K.Malde
J.Maranon
E.Mochizuki
J.Miller
M.Moeller
IPS Observatory
N.Parker
D.Reynolds
E.Richardson
A.Ritchie
G.Schott
G.Scholl
C.Simpson
B.Gordon-States
G.Stefanopoulis
G.Stemmler
N.Stoikidis
M.Suzuki
Paul Soron
K.Szatkowski
M.Szulc
D.Teske
R.Thompson
J.Temprano
A.Vargas
D.Vidican
W.Wilson
H.Yesilyaprak
D.Zhdanok
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| Table III. Means of Raw Group Counts (RG) and Ratios of Spots to Groups (S:G) in July 2003 |
| Day |
RG |
S:G |
Day |
RG |
S:G |
Day |
RG |
S:G |
Day |
RG |
S:G |
| 1 |
8.3 |
6.4 |
9 |
6.4 |
9.4 |
17 |
7.8 |
10.3 |
25 |
4.4 |
2.3 |
| 2 |
6.3 |
8.6 |
10 |
5.4 |
7.8 |
18 |
7.5 |
10.8 |
26 |
3.2 |
1.9 |
| 3 |
4.1 |
14.2 |
11 |
5.3 |
6.2 |
19 |
8.5 |
11.4 |
27 |
3.3 |
2.4 |
| 4 |
3.7 |
15.7 |
12 |
5.8 |
6.2 |
20 |
10.3 |
11.5 |
28 |
4.3 |
5.1 |
| 5 |
2.9 |
17.2 |
13 |
8.1 |
6.2 |
21 |
10.3 |
9.5 |
29 |
3.8 |
5.8 |
| 6 |
3.6 |
14.4 |
14 |
8.4 |
6.1 |
22 |
8.8 |
8.3 |
30 |
3.7 |
6.5 |
| 7 |
5.4 |
10.0 |
15 |
8.6 |
6.6 |
23 |
8.3 |
5.5 |
31 |
3.8 |
5.3 |
| 8 |
6.4 |
10.9 |
16 |
7.9 |
6.5 |
24 |
7.4 |
3.9 |
Mn. |
6.2 |
8.2 |
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Click image to enlarge.
Fig. 1. 10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for July 2003
(10cm Source: http://www.drao.nrc.ca/icarus) |
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Click image to enlarge.
Fig.2 Maximum, Mean, and Minimum Ra Values for Each Month from January 2001 to Present. |
Editor's Note
Beginning this month, modifications will be made to the sunspot pages of the Bulletin. For example, the content of Table I will be changed to reflect the fact that, because the Wolf scale is bounded at zero and contains no values between 0 and 11, the current statistics (s.d./s.e.) provide less and less appropriate estimates of report variation as the sunspot minimum is approached. An alternative measure of the variation in the final index (Ra), perhaps the range, will be substituted. And, since the American (Ra) and International (Ri) sunspot indices are typically highly correlated, we shall, discontinue the practice of plotting the Ri values. Observers interested in those values can find them at: http://www.sidc.oma.be/index.php3. Other changes will be mentioned as they occur.
Michael Hill, SID Analyst
114 Prospect St
Marlborough, MA 01752 USA
noatak@aol.com |
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Sudden Ionospheric Disturbances (SID) Recorded During July 2003
| (Analysis performed by Michael Hill, SID Analyst) |
| Date |
Max |
Imp |
Date |
Max |
Imp |
Date |
Max |
Imp |
| 030702 |
0717 |
2+ |
030720 |
1208 |
1- |
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| 030702 |
0732 |
2 |
030720 |
1453 |
1 |
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| 030703 |
0603 |
2+ |
030720 |
1611 |
2 |
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| 030704 |
0557 |
3 |
030722 |
0717 |
2 |
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| 030704 |
1448 |
2+ |
030722 |
0822 |
2 |
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| 030704 |
1459 |
2 |
030723 |
0557 |
1+ |
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| 030705 |
0919 |
2 |
030723 |
1139 |
1+ |
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| 030708 |
0732 |
2 |
030723 |
1532 |
1+ |
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| 030710 |
0638 |
1+ |
030729 |
0135 |
2 |
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| 030710 |
1401 |
2 |
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| 030712 |
0633 |
1 |
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| 030712 |
0958 |
1- |
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| 030712 |
1621 |
1+ |
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| 030712 |
1904 |
2 |
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| 030712 |
2048 |
2 |
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| 030713 |
1227 |
1 |
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| 030717 |
0800 |
3+ |
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| 030717 |
0823 |
2 |
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| 030717 |
0918 |
1- |
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| 030717 |
1530 |
1 |
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| 030719 |
0950 |
3 |
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| 030719 |
0932 |
1 |
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| 030720 |
0808 |
1+ |
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| 030720 |
0822 |
1- |
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| 030720 |
0957 |
1 |
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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 |
| J Winkler |
A50 |
NPM XXX |
| D Toldo |
A52 |
NWC XXX |
| J Ellerbe |
A63 |
ICV |
| W Moos |
A84 |
FTA |
| G DiFillipo |
A93 |
DHO HWU |
| M King |
A99 |
HWU |
| G Bressan |
A101 |
DHO |
| F Steyn |
A102 |
NWC |
| L Observatory |
A107 |
DHO |
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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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Many of you will notice a significant number of regular observers not contributing this month. This list includes myself and most of the East Coast observers who monitor NAA in Cutler, Maine. This station has been off-line for over a month now. It has been surmised, probably correctly, that it may be down for large scale maintenance of the towers in order to perform paint removal and re-painting. When one considers that there are large number of towers at this site and that they are very tall, it is no wonder that it is taking so long to complete this task. We will all be very happy when they come back on-line. We had plenty of observers to take up the slack, however. Even so, July was a pretty slow month for SID events. This month there were only 36 correlated events, quite a drop from last month's 89. Most of these were of lower importance rating. The GOES-12 Satellite reported 281 X-Ray flares. Of these, only 6 were M-Class and there were no large X-Class flares. The busiest period was from the 15th to the 21st. The M-Class flares occurred at other times of the month, however. There have been a lot of large sunspot groups still visible on the sun, however they were certainly not as active last month as they have been in previous months. It will be interesting as we approach minimum to see how the spot counts compare to the SID counts. Could the spots be large in area, but with less energetic activity as the cycle winds down? It might be worth keeping an eye on. Thanks for all your data. Your contributions are very helpful, especially when a large segment of us cannot observe due to VLF station maintenance which is inevitable from time to time.
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