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Solar Bulletin, February 2005
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 61 Number 2 | February 2005 |
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Table I. Mean Sunspot Numbers for February 2005
[boldface = maximum, minimum] | Table II. February Observers
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| Day |
N |
Raw Mean |
Ra |
| 1 |
25 |
28 |
21 |
| 2 |
30 |
25 |
18 |
| 3 |
26 |
15 |
11 |
| 4 |
29 |
21 |
15 |
| 5 |
32 |
28 |
21 |
| 6 |
34 |
47 |
33 |
| 7 |
31 |
49 |
35 |
| 8 |
28 |
49 |
34 |
| 9 |
33 |
57 |
42 |
| 10 |
34 |
65 |
46 |
| 11 |
36 |
71 |
52 |
| 12 |
31 |
77 |
56 |
| 13 |
30 |
69 |
52 |
| 14 |
30 |
57 |
42 |
| 15 |
33 |
70 |
50 |
| 16 |
26 |
62 |
43 |
| 17 |
32 |
63 |
44 |
| 18 |
28 |
50 |
37 |
| 19 |
23 |
44 |
32 |
| 20 |
25 |
35 |
26 |
| 21 |
30 |
31 |
22 |
| 22 |
30 |
28 |
20 |
| 23 |
39 |
19 |
14 |
| 24 |
27 |
13 |
10 |
| 25 |
33 |
15 |
10 |
| 26 |
37 |
7 |
4 |
| 27 |
37 |
2 |
1 |
| 28 |
30 |
3 |
2 |
| 29 |
--- |
--- |
--- |
| 30 |
--- |
--- |
--- |
| 31 |
--- |
--- |
--- |
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Means: | 30.7 | 39.3 | 28.3 |
No. of Observers: 61
No. of Observations: 859
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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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|
| 14 |
AAP |
P.Abbott |
| 27 |
ARAG |
G.Araujo |
| 9 |
BARH |
H.Barnes |
| 4 |
BATR |
R.Battaiola |
| 12 |
BERJ |
J.Berdejo |
| 6 |
BLAJ |
J.Blackwell |
| 16 |
BMF |
M.Boschat |
| 19 |
BOSB |
B.Bose |
| 24 |
BRAB |
B.Branchett |
| 24 |
BRAD |
D.Branchett |
| 2 |
BRAM |
M.Bradbury |
| 20 |
BRAR |
R.Branch |
| 21 |
BROB |
R.Brown |
| 4 |
CAMP |
P.Cambell |
| 25 |
CHAG |
G.Morales |
| 18 |
CKB |
B.Cudnik |
| 9 |
CLZ |
L.Corp |
| 2 |
COMT |
T.Compton |
| 25 |
CR |
T.Cragg |
| 21 |
DEJV |
J.van Delft |
| 7 |
DGP |
G.Dyck |
| 22 |
DRAJ |
J.Dragesco |
| 18 |
DUBF |
F.Dubois |
| 10 |
FEEC |
C.Feehrer |
| 8 |
FERJ |
J.Fernandez |
| 17 |
FLET |
T.Fleming |
| 22 |
FUJK |
K.Fujimori |
| 4 |
GOEM |
M.Goetz |
| 9 |
HAYK |
K.Hay |
| 20 |
JAMD |
D.James |
| 15 |
JEFT |
T.Jeffrey |
| 16 |
KAPJ |
J.Kaplan |
| 20 |
KNJS |
J&S Knight |
| 6 |
KROL |
L.Krozel |
| 9 |
LARJ |
J.Larriba |
| 11 |
LERM |
M.Lerman |
| 22 |
LEVM |
M.Leventhal |
| 8 |
MARE |
E.Mariani |
| 25 |
MARJ |
J.Maranon |
| 20 |
MCE |
E.Mochizuki |
| 13 |
MEU |
E.Mason |
| 16 |
MMI |
M.Moeller |
| 19 |
OBSO |
IPS Observatory |
| 13 |
RICE |
E.Richardson |
| 21 |
RITA |
A.Ritchie |
| 13 |
SCGL |
G.Schott |
| 12 |
SCHG |
G.Scholl |
| 2 |
SDP |
D.Sharples |
| 7 |
SIMC |
C.Simpson |
| 3 |
STEF |
G.Stefanopoulos |
| 8 |
STEM |
G.Stemmler |
| 13 |
STQ |
N.Stoikidis |
| 22 |
SUZM |
M.Suzuki |
| 16 |
SZUM |
M.Szulc |
| 15 |
TESD |
D.Teske |
| 11 |
THR |
R.Thompson |
| 16 |
TJV |
J.Temprano |
| 10 |
URBP |
P.Urbanski |
| 11 |
VARG |
A.Vargas |
| 14 |
WILW |
W.Wilson |
| 13 |
YESH |
H.Yesilyaprak |
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| Table III. Means of Raw Group Counts (RG) and Ratios of Spots to Groups (S:G) in February 2005 |
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Click image to enlarge.
Fig. 1. 10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for February 2005
(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 August 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 February 2005
| (Analysis performed by Michael Hill, SID Analyst) |
| Date |
Max |
Imp |
| 050204 |
1508 |
1 |
| 050206 |
0930 |
2 |
| 050206 |
0940 |
1- |
| 050207 |
0950 |
1- |
| 050207 |
1701 |
1- |
| 050208 |
1526 |
1 |
| 050213 |
1039 |
1 |
| 050216 |
1638 |
1- |
| 050219 |
1051 |
2 |
| 050219 |
1100 |
2 |
| 050223 |
0630 |
1+ |
| 050223 |
0935 |
1 |
| 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 NAU |
| J Winkler |
A50 |
NAA |
| D Toldo |
A52 |
NWC |
| S Hansen |
A59 |
NAA |
| P King |
A80 |
FTA |
| M Hill |
A87 |
NAA |
| L Anderson |
A91 |
NWC |
| G Di Filippo |
A93 |
DHO |
| T Poulos |
A95 |
NAA |
| J Wallace |
A97 |
NAA |
| G Bressan |
A101 |
HWU |
| F Steyn |
A102 |
NAA NWC |
| L Observatory |
A107 |
DHO |
| P Mortfield |
A108 |
NAA |
| A Son |
A112 |
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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February was a very slow month for SID events. Our observers recorded the lowest count of SIDs that I have seen in my five years of acting SID Analyst. Only twelve! And of these, most were low importance rating events. A slow month indeed and quite a switch from last months very large number of SID events due to sunspot region 720. There was no such region this month which clearly shows how just one very active region can really cause the numbers to spike to high levels in an otherwise quiet time for solar activity.
There were only 143 X-Ray flares recorded by the GOES-12 spacecraft in February which is also a fairly low number. Of these, only one was an M-Class event. All the rest were B and C Class events.
Thank you all for sending in your data. It is appreciated, even those that report in that no SID events were recorded for the month.
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Solar Flare Summary Based on GOES-12 Data
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