AAVSO: Solar Bulletin August, 2001

Sudden Ionospheric Disturbance Report

From the August 2001 Solar Bulletin

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

Sudden Ionospheric Disturbances (SID) Recorded During August 2001

(Analysis performed by Michael Hill, SID Analyst)
Date	Max	Imp	Date	Max	Imp	Date	Max	Imp
010802	1208	1	010807	0739	2+	010813	1400	2+
010802	1241	2+	010807	0854	1+	010814	0947	2
010802	1500	1+	010807	1049	2	010816	1000	2
010802	1613	2	010807	1137	1+	010816	1525	1-
010802	1858	1	010807	1304	2	010817	0915	2+
010802	2016	2	010807	1336	2	010818	0402	1-
010803	0307	1	010807	1447	2	010818	1252	1+
010803	1006	1+	010807	1540	2	010820	0823	1
010803	1149	1+	010807	1630	1+	010821	2200	2
010804	0951	1+	010807	1855	1+	010822	0507	2
010804	1232	2+	010807	2128	2+	010822	0740	2
010804	1845	2	010807	2331	1	010822	0912	1+
010804	1945	1	010808	0711	1	010822	0940	1
010805	1254	1	010808	0800	2+	010822	1220	2
010805	1325	1	010808	1022	1-	010822	1509	1
010805	1440	1	010808	1032	1-	010822	1555	1
010805	1505	1	010808	1503	1+	010822	1731	2
010805	1533	2	010808	1700	2	010823	0515	2+
010805	1832	1+	010808	2001	1+	010823	0800	2
010805	2126	1+	010809	0650	2	010823	0950	1
010805	2222	2+	010809	0727	2	010823	1349	2
010806	0733	1+	010809	0815	1+	010823	1357	1
010806	0800	2	010809	1102	2	010823	1757	2
010806	1219	1+	010809	1832	2+	010824	0630	2+
010806	1527	2	010812	2100	2	010824	0910	2+

(Event Listing - Continued)
Date	Max	Imp	Date	Max	Imp	Date	Max	Imp
010824	1320	1-	010826	0925	1+	010829	0914	2+
010824	1335	2	010826	1010	2	010829	1115	1+
010824	1511	1+	010826	1305	2+	010829	1246	2+
010824	1700	2	010827	1342	1+	010829	1445	2+
010824	1800	2	010827	1415	2+	010829	1825	2+
010824	1850	2+	010827	1531	2	010829	2020	2
010824	2030	2+	010828	0007	1+	010830	0646	1+
010824	2115	1+	010828	0653	1	010830	0820	1+
010824	2245	2+	010828	0825	2+	010830	1733	1-
010825	0727	2	010828	0927	1	010830	1752	2
010825	0821	1	010828	1147	1	010830	2035	2
010825	0845	1-	010828	1230	2	010831	1040	2
010825	0928	1+	010828	1340	2+	010831	1145	2+
010825	0958	1-	010828	1437	1	010831	2113	2+
010825	1326	1	010828	1538	1	010831	2242	2+
010825	1413	2	010828	1610	2+
010825	1531	1-	010828	1947	1
010825	1642	2+	010828	2007	2
010825	1957	1	010829	0516	2
010825	2222	1+	010829	0718	2

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

Reported in at least two observer reports
Visually analyzed with definiteness rating = 5
Reported by overseas observers with high definiteness rating

Observer	Code	Station(s) monitored
A Clerkin	A29	NAA
J Winkler	A50	NAA, NPM
D Toldo	A52	NWC, NAA, NSS
A Stokes	A62	NAA
W Moos	A84	FTA, ICV
G DiFillipo	A93	HWU
T Poulos	A95	NAA
R Battaiola	A96	NWU
J Wallace	A97	NAA
M King	A99	GYA
G Bessen	A101	NDH

Importance	Duration (min)
1-	< 19
1	19 – 25
1+	26-32
2	33-45
2+	46-85
3	86-125
3+	> 125

Solar Events

August turned out to be a very active month. Many observers who sent in data remarked to me how many SID events they had detected. Indeed there were so many events that I had to change the format of the report somewhat to accomadate the event listings.

There were 323 X-Ray flares reported by the GOES-8 Satellite. Of these, 22 of them were powerful M Class flares and one, on the 25th, was rated as an X5.3 class event. The activity clustered about the 5th of the month and the 24th. Our observers recorded a record 130 events, the largest event list that I have ever seen. Most of the events recorded were also centered about the 5th and 24th of the month with a couple of unusually quiet days on the 10th and 11th of the month.

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