Message-ID: <002001c0e561$69fc3a60$09dc9384@ma.ultranet.com>
From: "John Andrews" <w1tag@charter.net>
To: rsgb_lf_group@blacksheep.org
Cc: kayser@sympatico.ca
References: <003201c0e3dc$ea7f5ea0$c7727ad5@default> <013501c0e514$fb099630$0a00a8c0@ThreeLakes.ca> <000901c0e53f$9a640380$0a00a8c0@ThreeLakes.ca>
Subject: LF: Re: CME with a "Glancing pass near Earth"?
Date: Fri, 25 May 2001 17:26:21 -0400
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Larry,

> First, thanks for looking at this.  I have a strong interest in figuring
out
> how to tell if a CME from the Sun is going to come within  about 7.5
Million
> miles of the earth.  A second level of information needed is to understand
> the energy level of the particles that are going by us at a given time.
> A really great end game for this inquiry would be to understand how to
look
> at a CME event and to quickly determine if the CME will come within about
> 7.5 Million miles of the earth.

My limited understanding of this subject is that we currently have a
two-dimensional view of what is obviously a three-dimensional process. With
this limitation, it is difficult to predict the arrival time or severity of
the effects from a CME. If an ejection occurs from the Sun's limb, it is
unlikely to be earth-directed, of course. But predictions of CME's from the
rest of the visible side of the Sun appear to be vague, until they arrive at
satellites in near earth orbit.

I remember seeing a TV special that described plans for locating satellites
at  the Lagrange points, thus providing 3-d viewing.

John Andrews, W1TAG