[Aavso-sid-list] Meteor Storms and Possible VLF Effects ?

[Thomas Ashcraft]

For those interested in this article for their own personal research I 
can email it as a .pdf file. But it cannot be posted on the web publicly 
due to copyright concerns. For personal research only please.

You can email me at    :  ashcraft(at)heliotown.com

Thomas Ashcraft wrote:
> Have any SID observers here connected any observations to meteor storms?
>
> For those interested in the possible connection between meteors and VLF 
> effects: Here is the abstract of a paper published in Science. Sorry, I 
> don't know how to retrieve the full paper. I do remember reading this 
> article many years ago and questioning the results that the researchers 
> arrived at.
>
> - Thomas Ashcraft
>
> *********
>
> http://www.sciencemag.org/cgi/content/abstract/246/4931/787?ck=nck
>
> /Science/ 10 November 1989:
> Vol. 246. no. 4931, pp. 787 - 790
> DOI: 10.1126/science.246.4931.787
>
>
> Articles
>
>
> Effects of the Large June 1975 Meteoroid Storm on Earth's Ionosphere
>
> *P. Kaufmann ^1 , V. L. R. Kuntz ^1 , N. M. Paes Leme ^1 , L. R. Piazza 
> ^1 , J. W. S. Vilas Boas ^1 , K. Brecher ^2 , and J. Crouchley ^3 *
>
> ^1 Centro de Ráadio-Astronomia e Aplicacäes Espaciais-CRAAE, Escola 
> Politécnica, Universidade de São Paulo, C. P. 8174, 05508—São Paulo, Brazil
> ^2 Department of Astronomy, Boston University, Boston, MA 02215
> ^3 Department of Physics, University of Queensland, St. Lucia, 
> Queensland 4067, Australia
>
> The June 1975 meteoroid storm detected on the moon by the Apollo^ 
> seismometers was the largest ever observed. Reexamination of^ radio data 
> taken at that time showed that the storm also produced^ pronounced 
> disturbances on Earth, which were recorded as unique^ phase anomalies on 
> very low frequency (VLF) radio propagation^ paths in the low terrestrial 
> ionosphere. Persistent effects^ were observed for the major storm period 
> (20 to 30 June 1975),^ including reductions in the diurnal phase 
> variation, advances^ in the nighttime and daytime phase levels, and 
> reductions in^ the sunset phase delay rate. Large nighttime phase 
> advances,^ lasting a few hours, were detected on some days at all VLF 
> transmissions,^ and for the shorter propagation path they were 
> comparable to^ solar Lyman alpha daytime ionization. Ion production 
> rates attributable^ to the meteor storm were estimated to be about 0.6 
> to 3.0 ions^ per centimeter cubed per second at the E and D regions, 
> respectively.^ The storm was a sporadic one with a radiant (that is, the 
> point^ of apparent origin in the sky) located in the Southern 
> Hemisphere,^ with a right ascension 1 to 2 hours larger than the sun's 
> right^ ascension.
>
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