PSN-L Email List Message

Subject: PSN-L: Passing solar flare geomagnetic shock wave?
From: walt_williams@........
Date: Sun, 11 Jun 2000 01:40:34 -0800

Hi Merideth, Cap, and All,

See the HLMS array database for June 8, 10 - 11 UT:,129

The bottom line is a RIOmeter graph, "Relative Ionospheric Opacity 
METER". Instrument measures the Cosmic noise absorption (CNA) of 
the ionosphere with relation to the Solar proton flux density charging 

for visual index:

and database catalog page:

The lab presents a nice 'web-tour' of the PFRR lab, a miniature 
JPL with local launch capability in the high latitudes, lots of 
interesting reading and pictures.

Best Wishes,

Walt Williams

Organization for SETV Research (OSR)
Northridge California, USA



------- Forwarded Message Follows -------
From:          CapAAVSO@.......
Date:          Sat, 10 Jun 2000 12:25:00 EDT
Subject:       Re: Passing solar flare geomagnetic shock wave?
To:            psn-l@..............
Reply-to:      psn-l@..............

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 earthquakes? 

Best regards, 



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