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## LF: Re: CME with a "Glancing pass near Earth"?

 To: [email protected] LF: Re: CME with a "Glancing pass near Earth"? "John Andrews" <[email protected]> Fri, 25 May 2001 17:26:21 -0400 [email protected] <[email protected]> <[email protected]> <[email protected]> [email protected] <[email protected]>
 ```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 ```
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