grades k-3

    This experiment is to take pictures of the corona using an electronic camera and a telephoto lens. These pictures will be compared with those from the SOHO spacecraft, which orbits the sun one-and-a-half million kilometers ahead of the earth (4 times the distance from the Earth to the Moon).

    Because SOHO is far away from the Earth and Moon, it always has a good view of the sun, and never sees any eclipses.

    The SOHO spacecraft has a special type of telescope for looking at the corona (called a coronagraph) which blocks out the disk of the sun so that the corona can be seen (just like what happens during an eclipse when the Moon goes in front of the sun).

     But the 'eclipse' that SOHO makes isn't as perfect as an eclipse on Earth so scientists need images of the sun during an eclipse on Earth to find out how they can make their eclipses on the spacecraft better.

SOHO new looks at the Sun

These images were taken by the Solar and Heliospheric Observatory (SOHO) spacecraft. Because of the high quality instruments, more of the subtle and detailed magnetic features can be seen than ever before.
(Courtesy ESA/NASA)

    Prof. Pasachoff and his team are making such an image, matching the details of the filter and field of view to one of the SOHO coronagraphs.


The Williams College Eclipse Expedition is set up and training for eclipse day!

    In their "Shantytown" on top of the Mill Condominium (their hotel), they have built a house to block the wind. The wind has been blowing so hard on the island that it is hard to keep anything from shaking. Their wind screens look like a small shack on the roof of the hotel.

They decided to stay on the northside of the island. The southern tip of the island, which will have 30 seconds more of totality, is hard to get to and has an oil refinery that puts a lot of smoke into the air. So, the experiments will be done in a shorter amount of time.

Steve Martin works on the camera

    Steve Martin from Williams College works on the electronic camers. This camera will take a computer photograph of the total solar eclipse. This picture will be used to help the SOHO spacecraft make better eclipses with its coronagraph.

    The heat on Aruba has made the camera not work as well as it should. Steve made a cooling system with ice water from a hotel ice bucket running around the camera to help it stay cool.

Steve Martin makes a cooling system for the camera

Read more about this experiment in Fun Stories!


Do you want to ask a question of the researchers?

Experiment 1 for grades 4-6  Experiment 2 for grades 4-6  Eclipse '98