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A pdf format of the Solar Bulletin is available for printing.
| Paul Mortfield, Editor | Web: www.AAVSO.org |
| c/o AAVSO 49 Bay State Rd. | Email: Paul@IndustrialStars.com |
| Cambridge, MA 02138 | ISSN 0271-8480 |
| Volume 63 Number 3 | March 2007 |
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Ode of the Solar Observers |
At 4 million tons a second,
You'd think that there might be,
A little bit of action
On the Solar disk to see.
But things are really slow-
The view is mostly orange or white;
And if it weren't for the chromospheres,
It would be a boring sight.
We see Old Sol rise in the east
And we check throughout the day;
Thinking that a flare or spot
Might be surfacing our way.
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Alas, no spots! Alack, no flares!
The numbers mostly zeroes!
Among the solar observing group Ð
It doesn't make for many heroes!
Minimum WILL come and
Minimum WILL go-
But those 4 million tons of hydrogen,
For 5 billion years could flow.
By Susan Oatney
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March has been pretty quiet for activity. Nothing in SID flares recorded again. We had a 35% increase in the number of solar observations over February which is great to see from our observers. However, the solar activity presented for us, were small single digit values. So has minimum arrived? Should we hold a raffle? Please keep up the constant vigil as the sun is always full of surprises and may sprout some sudden activity.
The STEREO spacecraft just published its first set of 3D solar images. You can see them at:
http://www.nasa.gov/mission_pages/stereo/news/stereo3D_press.html
NOTE:
Just a reminder to please submit drawings or photos you would like to see included in the solar bulletin. Please ensure they're submitted as jpegs.
Sudden Ionospheric Disturbance Report
Michael Hill, SID Analyst
114 Prospect St
Marlborough, MA 01752 USA
noatak@aol.com
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Sudden Ionospheric Disturbances (SID) Recorded During March 2007
(Analysis performed by Michael Hill, SID Analyst)
| Date |
Max |
Imp |
| NO EVENTS REPORTED - MAR 2007 |
| Importance rating: Duration | -1: <19 | 1: 19-25 | 1+: 26-32 | 2: 33-45 | 2+: 46-85 | 3: 86-125 | 3+: >125 |
March was a very slow month for SID activity. In fact there were no correlated SID events reported by any observers. Even the GOES-12 data was sparse. There were only 5 X-Ray flares recorded and all of these were only B-Class events.
Solar Flare Summary Based on GOES-12 Data
Sunspot Data
American Relative Sunspot Numbers(Ra) for March 2007
[boldface = maximum, minimum]
| Day |
N |
Raw
Mean |
Ra |
| 1 |
28 |
14 |
9 |
| 2 |
24 |
17 |
11 |
| 3 |
28 |
12 |
8 |
| 4 |
30 |
14 |
9 |
| 5 |
34 |
20 |
13 |
| 6 |
27 |
9 |
6 |
| 7 |
35 |
2 |
2 |
| 8 |
35 |
0 |
0 |
| 9 |
29 |
0 |
0 |
| 10 |
34 |
1 |
0 |
| 11 |
40 |
11 |
8 |
| 12 |
34 |
8 |
5 |
| 13 |
32 |
2 |
1 |
| 14 |
32 |
0 |
0 |
| 15 |
25 |
0 |
0 |
| 16 |
26 |
0 |
0 |
| 17 |
29 |
0 |
0 |
| 18 |
30 |
1 |
0 |
| 19 |
28 |
1 |
1 |
| 20 |
23 |
0 |
0 |
| 21 |
30 |
1 |
1 |
| 22 |
28 |
0 |
0 |
| 23 |
28 |
8 |
6 |
| 24 |
31 |
7 |
4 |
| 25 |
32 |
2 |
1 |
| 26 |
32 |
12 |
8 |
| 27 |
31 |
4 |
3 |
| 28 |
32 |
10 |
6 |
| 29 |
27 |
9 |
6 |
| 30 |
25 |
9 |
6 |
| 31 |
23 |
3 |
2 |
Means |
29.7 |
5.7 |
3.7 |
Total No. of Observers: 59
Total No. of Observations: 922
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March 2007 Sunspot Observers
| AAP |
A. Abbott |
19 |
| AJV |
J. Alonso |
14 |
| ARAG |
G. Araujo |
31 |
| BARH |
H. Barnes |
11 |
| BATR |
R. Battaiola |
6 |
| BEB |
R. Berg |
6 |
| BERJ |
J. Berdejo |
15 |
| BLAJ |
J. Blackwell |
1 |
| BMF |
M. Boschat |
19 |
| BRAB |
B. Branchett |
27 |
| BRAD |
D. Branchett |
21 |
| BRAR |
R. Branch |
22 |
| BROB |
R. Brown |
20 |
| BYG |
Y. Brovarets |
32 |
| CHAG |
G. Morales |
25 |
| CKB |
B. Cudnik |
23 |
| CLZ |
L. Corp |
6 |
| COMT |
T. Compton |
7 |
| CR |
T. Cragg |
29 |
| DEJV |
J. van Delft |
11 |
| DGP |
G. Dyck |
15 |
| DUBF |
F. Dubois |
27 |
| FERJ |
J. Fernandez |
11 |
| FLET |
T. Fleming |
23 |
| FUJK |
K. Fujimori |
25 |
| GFT |
F. Gobet |
11 |
| GOEM |
M. Goetz |
2 |
| HALB |
B. Halls |
13 |
| HAYK |
K. Hay |
16 |
| KAPJ |
J. Kaplan |
18 |
| KNJS |
J. & S. Knight |
11 |
| KQR |
R. Kinne |
9 |
| KROL |
L. Krozel |
2 |
| KUZM |
M. Kuzmin |
5 |
| LARJ |
J. Larriba |
19 |
| LERM |
M. Lerman |
1 |
| MARE |
E. Mariani |
5 |
| MARJ |
J. Maranon |
12 |
| MCE |
E. Mochizuki |
29 |
| MCHL |
L. McHenry |
2 |
| MEU |
E. Mason |
7 |
| MMI |
M. Moeller |
24 |
| OATS |
S. Oatney |
21 |
| OBSO |
IPS Observatory |
17 |
| PEKT |
R. Pektas |
18 |
| RICE |
E. C. Richardson |
7 |
| RITA |
A. Ritchie |
25 |
| SCGL |
G. Schott |
26 |
| SIMC |
C. Simpson |
7 |
| STEF |
G. Stefanopoulis |
6 |
| STQ |
N. Stoikidis |
21 |
| SUZM |
M. Suzuki |
25 |
| SZUM |
M. Szulc |
12 |
| TESD |
D. Teske |
30 |
| TJV |
J. Temprano |
6 |
| URBP |
P. Urbanski |
22 |
| VARG |
A. Vargas |
22 |
| WILW |
W. Wilson |
23 |
| WRP |
R. Wheeler |
2 |
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Reporting addresses:
Sunspot Reports
Email: solar@aavso.org
Postal Mail: AAVSO,
49 Bay State Rd. Cambridge, MA, 02138
Fax: 617-354-0665
SID Flare Reports
Email: noatak@aol.com
Postal Mail: Mike Hill,
114 Prospect St., Marlboro, MA, 01752
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Smoothed Mean Sunspot Numbers (Rsm) from January 2000 to September 2006 (Waldmeier method). |
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10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for March 2007
(10cm Source: http://www.drao.nrc.ca/icarus) |
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