630315Eclipse3_p5

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Eclipse Bulletin No. 3 cont'd.

7. RADIO RECEPTION

    The purpose of this project is to study the local effect of the eclipse on the
ionosphere by measuring changes in signal strength. The installation consists of
three or four receivers with signal strength meters. These are tuned in on diff-
erent radio stations both in the line of the eclipse and off the path. To establish
a norm, the equipnent should be in operation for a full hour before first contact
and a full hour after fourth contact. During these two one-hour periods, signal
strength readings should be taken every minute. During the eclipse partial phases
and totality - readings should be recorded more frequently. Ten-second intervals
are suggested but these should be somewhat longer - 15 or 20 seconds - if it is
found that the signal remains fairly steady.

    If possible, the equipnent should be installed on the previous day and the team
should go through the full routine for the same period as on eclipse day. Not only
will this furnish comparison graphs but will give the teams the practice needed to
carry out operations smoothly on eclipse day. Two persons should be assigned to
each receiver so that they can work on shifts.

    A special report form is being drawn up for this project and is available on
request.

                             *    *    *    *    *    *


       We realize that the brief descriptions given here may leave some questions
unanswered. If you have any particular problems, please let us know and we shall try
to help you solve them. Additional copies of this bulletin and the report form are
available, in limited quantity, on request. Bulletins 4 and 5, covering Photo graphic
Projects and Visual Observations, will be issued shortly.


       In planning your programme we would caution you against being too ambitious.
The period of totality is very short. There will be no tine for flase starts. It is
better to undertake only one pro ject and cb it well than to attempt several with in-
different results. Also, if you have never seen a total eclipse of the sun, you will
want some tine just to enjoy this wonderful spectacle. So plan your programme well,
practice the routine, become thoroughly familiar with your equipment, and weather
permittingi - all will go well on eclipse day.


       Please let us know about your plans as they develop and about any special
projects you may have in mind.



                                             Isabel K. Williamson
                                             National Co-ordinator 1963 Eclipse
                                             5162 Belmore Avenue,
                                             Montreal 29, Canada.



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