|
|
|
|
Solar Bulletin, April 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 |
|
| Volume 61 Number 4 | April 2005 |
|
Table I. Mean Sunspot Numbers for April 2005
[boldface = maximum, minimum] | Table II. April Observers
|
| Day |
N |
Raw Mean |
Ra |
| 1 |
33 |
19 |
13 |
| 2 |
33 |
33 |
24 |
| 3 |
34 |
40 |
30 |
| 4 |
37 |
48 |
35 |
| 5 |
40 |
54 |
39 |
| 6 |
37 |
43 |
31 |
| 7 |
29 |
37 |
27 |
| 8 |
35 |
36 |
26 |
| 9 |
43 |
41 |
30 |
| 10 |
41 |
33 |
24 |
| 11 |
38 |
22 |
15 |
| 12 |
39 |
34 |
24 |
| 13 |
39 |
43 |
32 |
| 14 |
44 |
49 |
36 |
| 15 |
46 |
47 |
34 |
| 16 |
40 |
41 |
30 |
| 17 |
38 |
40 |
27 |
| 18 |
40 |
40 |
28 |
| 19 |
44 |
33 |
24 |
| 20 |
32 |
34 |
24 |
| 21 |
43 |
23 |
16 |
| 22 |
37 |
20 |
15 |
| 23 |
32 |
16 |
11 |
| 24 |
36 |
7 |
4 |
| 25 |
32 |
14 |
10 |
| 26 |
39 |
18 |
12 |
| 27 |
39 |
29 |
20 |
| 28 |
34 |
45 |
32 |
| 29 |
35 |
51 |
37 |
| 30 |
30 |
52 |
36 |
| 31 |
--- |
--- |
--- |
|
Means: | 37.3 | 34.8 | 24.9 |
No. of Observers: 62
No. of Observations: 1119
|
|
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
|
|
| 16 |
AAP |
P.Abbott |
| 24 |
ARAG |
G.Araujo |
| 4 |
ARE |
R.Allessi |
| 17 |
BARH |
H.Barnes |
| 11 |
BATR |
R.Battaiola |
| 13 |
BERJ |
J.Berdejo |
| 12 |
BLAJ |
J.Blackwell |
| 13 |
BMF |
M.Boschat |
| 16 |
BOSB |
B.Bose |
| 29 |
BRAB |
B.Branchett |
| 27 |
BRAR |
R.Branch |
| 28 |
BROB |
R.Brown |
| 22 |
BVK |
K.Bankston |
| 7 |
CAMP |
P.Cambell |
| 28 |
CHAG |
G.Morales |
| 26 |
CKB |
B.Cudnik |
| 8 |
CLZ |
L.Corp |
| 17 |
COMT |
T.Compton |
| 30 |
CR |
T.Cragg |
| 21 |
DEJV |
J.van Delft |
| 9 |
DEMF |
F.Dempsey |
| 18 |
DGP |
G.Dyck |
| 17 |
DRAJ |
J.Dragesco |
| 25 |
DUBF |
F.Dubois |
| 16 |
FEEC |
C.Feehrer |
| 24 |
FLET |
T.Fleming |
| 26 |
FUJK |
K.Fujimori |
| 13 |
GOEM |
M.Goetz |
| 7 |
HAYK |
K.Hay |
| 16 |
HRUT |
T.Hrutkay |
| 23 |
JAMD |
D.James |
| 10 |
JEFT |
T.Jeffrey |
| 18 |
JENJ |
J.Jenkins |
| 22 |
KAPJ |
J.Kaplan |
| 20 |
KNJS |
J&S |
| 2 |
KROL |
L.Krozel |
| 15 |
LARJ |
J.Larriba |
| 4 |
LERM |
M.Lerman |
| 23 |
LEVM |
M.Leventhal |
| 13 |
MARE |
E.Mariani |
| 27 |
MARJ |
J.Maranon |
| 23 |
MCE |
E.Mochizuki |
| 25 |
MMI |
M.Moeller |
| 13 |
OBSO |
IPS Observatory |
| 17 |
RICE |
E.Richardson |
| 24 |
RITA |
A.Ritchie |
| 18 |
SCGL |
G.Schott |
| 6 |
SCHG |
G.Scholl |
| 2 |
SDP |
D.Sharples |
| 8 |
SIMC |
C.Simpson |
| 18 |
STEM |
G.Stemmler |
| 27 |
STQ |
N.Stoikidis |
| 25 |
SUZM |
M.Suzuki |
| 28 |
SZAK |
K.Szatkowski |
| 25 |
SZUM |
M.Szulc |
| 25 |
TESD |
D.Teske |
| 12 |
THR |
R.Thompson |
| 21 |
TJV |
J.Temprano |
| 26 |
URBP |
P.Urbanski |
| 18 |
VARG |
A.Vargas |
| 20 |
WILW |
W.Wilson |
| 21 |
YESH |
H.Yesilyaprak |
|
|
| Table III. Means of Raw Group Counts (RG) and Ratios of Spots to Groups (S:G) in April 2005 |
 |
 |
Click image to enlarge.
Fig. 1. 10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for April 2005
(10cm Source: http://www.drao.nrc.ca/icarus) |
 |
Click image to enlarge.
Fig.2 Smoothed Mean Sunspot Numbers (Waldmeier method) from January 2000 to October 2004. |
Michael Hill, SID Analyst
114 Prospect St
Marlborough, MA 01752 USA
noatak@aol.com |
 |
Sudden Ionospheric Disturbances (SID) Recorded During April 2005
| (Analysis performed by Michael Hill, SID Analyst) |
| Date |
Max |
Imp |
| 050405 |
2006 |
1+ |
| 050406 |
0602 |
2 |
| 050410 |
1804 |
2+ |
| 050410 |
1813 |
1+ |
| 050412 |
1721 |
2 |
| 050416 |
1632 |
2 |
| 050417 |
0143 |
1 |
| 050417 |
2107 |
2 |
| 050426 |
0443 |
2 |
| 050426 |
2004 |
2 |
| 050429 |
2043 |
1 |
| 050430 |
1827 |
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 NML |
| M Hill |
A87 |
NAA |
| J Mandaville |
A90 |
NPM |
| T Poulos |
A95 |
NAA |
| J Wallace |
A97 |
NAA |
| M King |
A99 |
HWU |
| P Campbell |
A100 |
NLK |
| F Steyn |
A102 |
NWC |
| P Mortfield |
A108 |
NAA |
| M Suhovecky |
A115 |
NAA |
|
| 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)
|
|
April was a very slow month for SID detection but there was a bit of activity resulting in 12 correlated SID events. There were only 133 X-Ray flare events recorded by the GOES-12 spacecraft.and of these, only 16 were M-Class events. The rest were C-Class events. The peak of activity was towards the end of the month and indeed, as we are seeing this month, this was a precursor to a much more active period. Thanks to all of you who are hanging in there as the solar minimum approaches. Your observations, as always, are valuable to the program. We have one new observer this month; Mark Suhovecky (A-115) contributed his first report this month. Mark lives in Indiana and is monitoring NAA in Cutler Maine. Welcome to the group from all of us.
|
Solar Flare Summary Based on GOES-12 Data
|
|
