Solar Storms and You!
Activity 9: A Soda Bottle Magnetometer....Data
This series of measurements was recorded in Adams, Massachusetts on December
25, 1998...yes, that's Christmas Day!
The mirror was located 32-inches from the wall, and its natural oscillation
period was about 4 seconds so movements damped out within a minute. At this
distance (0.82 meters), one inch change corresponds to a deflection of 0.9
degrees. A 1/8-inch movement coresponding to 0.1 degrees was barely visible
with the particular 'glint' that was used to track the deflections. A 0.1-inch
change corresponded to 0.09 degrees or about 5 arcminutes. the glint was about
1/4-inch wide at the wall. A significant feature of these measurements is that
the spot position changes betwen daytime and nighttime positions. It has long
been known that the magnetic field of the Earth does indeed have a diurnal
variation as the sun rises, transits the local meridian at noon, and sets,
with less activity being generated at night than during daytime. It is
possible that the above data shows this trend, and it is definitely something
for observers to look for in their data!
|Local Time||Relative Deflection|
Another series of observations were made on December 24, 1998 with the
The change seen between 3:50 and 4:10PM was due to a slight change in the
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