
Soda Bottle Magnetometer and Magnetic Storms
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Can a magnet inside a soda bottle detect storms from the Sun? Solar storms cause small shifts in Earth's magnetic field. A sensitive compass can pick up these changes.
You build a magnetometer using a soda bottle filled with sand. A bar magnet hangs from a thread inside the bottle. A small mirror on the magnet reflects a light spot onto a wall. When the magnetic field shifts, the spot moves. A one-centimeter shift equals about a quarter of a degree.
Track the spot's position over days or weeks. During a magnetic storm, the magnet swings several degrees within hours. It then returns to its normal position. Large storms often come with aurora displays. Daytime readings can help predict a nighttime light show.
Hypothesis
The hypothesis is that solar storms can affect the Earth's magnetic field, causing small changes in its direction at the surface.
Method & Materials
You will create a magnetometer to monitor changes in the Earth's magnetic field for signs of magnetic storms.
You will need a clean 2 liter soda bottle, 2 pounds of sand, 2 feet of sewing thread, a small bar magnet, a 3x5 index card, a 1 inch piece of soda straw, a mirrored dress sequin or small craft mirror, super glue, 2 inch clear packing tape, a meter stick, and an adjustable high intensity lamp with a clear bulb.
Results
With this project, you can detect magnetic storms and measure the changes in the light spot position to detect magnetic storm events. You can even determine the direction of a car's motion by seeing if the spot initially moves east or west!
Why do this project?
This project is interesting and unique because it allows students to monitor changes in the magnetic field that occur inside the classroom. It is also a great way to learn about the effects of solar storms on the Earth's magnetic field.
Also Consider
Experiment variations to consider include measuring the magnetic activity from day to day by measuring the distance between the reference spot and the current spot, and measuring the magnetic activity from different geographic locations.
Full project details
Additional information and source material for this project are available below.Related video
These videos explain the science behind this project and demonstrate key concepts used in the experiment.
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