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Old 10-30-2005, 08:21 AM
Khopesh Khopesh is offline
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Join Date: Oct 2005
Posts: 61
Default Re: whale beachings, sonar, and earthquakes.

Yeah
North West Cape is definatly atmospheric.
Gotta love uni astronomers that dont yet realise they shouldnt mention certain things, ill also post the "Bright Skys" link if I can find it again.

GCN notice #1394
G.J. Fishman, P.M.. Woods, C. Hossfield and L. Anderson report that the X-ray rich event of April 27, 2002 was detected as a Sudden Ionospheric Disturbance (SID) by Len Anderson in South Perth Australia, indicating that XRF 020427 (GCN 1383), produced a prodigious amount of ionizing x-ray flux. The disturbance is clearly seen, lasting about one minute, in a low-resolution all-day strip chart recording from a Very Low Frequency (VLF) radio receiver near Perth. Although a quantitative measure of the flux of this event could not be determined by this method, the SID magnitude (and thus the ionizing flux) is comparable to that observed from the Aug. 27, 1998 super-flare from SGR 1900+14 (Inan, et al., Geophys. Res. Lett., v.26, p.3357, 1999). A large flux of x-rays below ~15 keV was deduced from that flare (op. cit.). One intense gamma-ray burst, GRB830801, was also observed to produce a SID but at a much weaker level (Fishman and Inan, Nature v.331, p.418, 1988). The strong ionizing present in this burst confirms that this is a long, x-ray rich event of unknown origin, as suggested by in't Zand et al. (GCN 1383).
Note: SIDs have been used to study solar flares since the 1950s. In this case, the SID was observed as a major change in the propagation of a continuous VLF radio transmission at 19.8 kHz from Northwest Cape, Australia. The VLF radio receiver trace can be seen at:
http://gammaray.nsstc.nasa.gov/~woods/xrf020427.html
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I cant find the original I remember reading but this elaborates a little on North West Capes "real" purpose, although I cant find anything on the LaTrobe valley installation.

http://ellisctaylor.homestead.com/BRIGHTSKIES.html
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