Gema Araujo caught wonderful images of AR0969 on August 24, 2007, a few minutes before (left) and an hour after (right) a class C2.0 flare erupted and recorded by several SID observers. Click here to see more of Gema's nearly daily images.

August must have produced many clear days as sunspot observers added nearly 200 more observations this month than July. Hopefully the clear weather trend will continue into September.

Remember to send me any solar drawings, SID flares or photos for me to include here.

Michael Hill, SID Analyst 114 Prospect St Marlborough, MA 01752 USA noatak@aol.com

The events listed above meet at least one of the following criteria

1. Event reported by two or more observers within +/- 5 minutes
2. Event matched to GOES-8 XRA event to within +/- 15 minutes and event time < 1000 UT
3. Reported by observer with a high quality rating > 8 (scale 1-10)

Solar Events

August was an exceptionally slow month again for SID activity. There were only 3 correlated SID events reported by observers. Even the GOES Spacecraft did not see much action recording only 17 X-Ray flare events. All of these in fact were only B and C class events.

One of our observers Jon Wallace (A97) had the pleasure of visiting one of the most powerful VLF stations that are used in the SID program (NAA in Cutler, Maine) here is a picture that gives an idea of the size of one of these transmitting stations.

Solar Flare Summary Based on GOES-12 Data

Sunspot Data

American Relative Sunspot Numbers(Ra) for August 2007 [boldface = maximum, minimum] Day N Raw Mean Ra 1 38 0 0 2 29 0 0 3 44 3 2 4 41 10 7 5 37 11 8 6 37 14 10 7 35 12 9 8 36 16 12 9 31 15 11 10 33 14 10 11 37 11 8 12 41 9 5 13 39 6 4 14 38 2 1 15 37 1 1 16 37 0 0 17 40 0 0 18 39 0 0 19 36 0 0 20 38 0 0 21 32 11 7 22 34 12 9 23 32 13 9 24 33 14 10 25 38 13 10 26 40 13 10 27 37 12 9 28 40 13 10 29 34 13 9 30 33 19 14 31 36 22 17 Means 36.5 9.0 6.5 Total No. of Observers: 58 Total No. of Observations: 1132

August 2007 Sunspot Observers AAP A. Abbott 17 AJV J. Alonso 27 ARAG G. Araujo 31 ARE R. Allessi 2 BARH H. Barnes 10 BATR R. Battaiola 18 BEB R. Berg 10 BERJ J. Berdejo 6 BMF M. Boschat 19 BRAB B. Branchett 30 BRAD D. Branchett 22 BRAR R. Branch 31 BROB R. Brown 31 BVC A. Buck 31 CHAG G. Morales 30 CKB B. Cudnik 17 CLZ L. Corp 9 CNT D. Chantiles 6 COMT T. Compton 14 DEJV J. van Delft 41 DGP G. Dyck 19 DUBF F. Dubois 27 FLET T. Fleming 27 FUJK K. Fujimori 27 GFT F. Gobet 19 GOEM M. Goetz 8 HALB B. Halls 16 HAYK K. Hay 21 HMQ M. Harris 12 KAPJ J. Kaplan 17 KNJS J. & S. Knight 10 KROL L. Krozel 2 KUZM M. Kuzmin 6 LARJ J. Larriba 9 LERM M. Lerman 15 MARJ J. Maranon 30 MCE E. Mochizuki 23 MCHL L. McHenry 2 MILJ J. Miller 17 MMI M. Moeller 24 OATS S. Oatney 28 OBSO IPS Observatory 18 RICE E. C. Richardson 19 RITA A. Ritchie 22 SCGL G. Schott 27 SIMC C. Simpson 6 STEF G. Stefanopoulis 16 STEM G. Stemmler 22 STQ N. Stoikidis 29 SUZM M. Suzuki 30 SZUM M. Szulc 31 TESD D. Teske 28 TJV J. Temprano 18 URBP P. Urbanski 23 VIDD D. Vidican 21 WILW W. Wilson 28 WRP R. Wheeler 2 YESH H. Yesilyaprak 31

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

Smoothed Mean Sunspot Numbers (Rsm) from January 2000 to January 2007 (Waldmeier method).

10 cm Solar Flux and American Relative Sunspot Numbers (Ra) for August 2007 (10cm Source: http://www.drao.nrc.ca/icarus)