PSN-L Email List Message

Subject: Re: Passing solar flare geomagnetic shock wave?
From: CapAAVSO@.......
Date: Sat, 10 Jun 2000 12:25:00 EDT

In a message dated 6/10/00 12:26:39 AM Eastern Daylight Time, 
mlamb1@.......... writes:

<< Thanks Chris,
 I checked right away, and think I have to withdraw any
 geo-magnetic conclusions; there just isn't any realistic match
 comparison.  Nice of you to forward the web sites to explore,
 and answer the question.
 Take care,
 Meredith Lamb >>
Hi Meredith, 
    That big pulse you recorded on 8 June was REAL despite your not being 
able to find it on those high-latitude European magnetic station's 
recordings. Here's how Jim Mandaville, an amateur in Tuscan, AZ  described 
it: "It hit my magnetometer around 1100 UTC Thursday.  The positive jump was 
so abrupt and strong that when I saw it in the morning I thought  (1) my 
electronics had gone berserk or (2) a prowler had come and parked his getaway 
car beside my house!  But when I checked the USGS Tucson magnetogram, it was 
identical.  This unusual storm remained strongly
positive for several hours, then fell back into the negative region (but
not strongly so), then slowly recovered through the day.  I got a good
recording of it all. 
    Here's how Alex McWilliams saw it at his amateur magnetic observatory in 
Minnesota: "A VERY unusual spike happened at close to 1230 UTC  when the pen 
shot up very rapidly a very large amount and then recovered to original level 
- all in a matter of perhaps less than a minute.  I do not recall
moving anything in the house at that time." 
    So you see, Meredith, your recording was no an artifact after all. It was 
an accurate recording of a real event. By the way, What is a diamagnetic 
horizontal seismograph and why does it record magnetic storms in addition to 
Best regards,

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Larry Cochrane <cochrane@..............>