geo-magnetic storms

[ames@nebula.decnet.lockheed.com (ames@nebula.decnet.lockheed.com)]

        Now that I've learned enough about propagation to know
that geo-magnetic storms are a significant source of noise on
the HF bands, I find WWV is a bit late in informing us of them.
The October issue of SKY & TELESCOPE (p.85) has an article on
building a magnetometer to detect the phenomea.  The circuit is
rather simple, and was designed to provide an Aurora alert.  So,
it should be applicable for HF usage (and VHF).

alan, N2ALE/6