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Name(s): _____________________________ _____________________________
_____________________________ _____________________________
Date: __________________ Course/Section: __________________
Grade: __________________
Observing the Sun
Objectives:
This lab will introduce students to different observing methods and safety concerns when viewing the Sun. Students will study different types of features on the surface of the Sun, and will measure the Sun's rotation rate by tracking surface features.
Checklist:
□ Complete the pre-‐lab quiz with your team (if required). □ Compile a list of resources you expect to use in the lab. □ Work with your team to complete the lab exercises and activities. □ Record your results and mark which resources you used. □ Share and discuss your results with the rest of the class. □ Determine if your team’s answers are reasonable. □ Submit an observation request for next week (if required).
Pre-‐Lab Quiz
Record your group's answers to each question, along with your reasoning. These concepts will be relevant
later in this lab exercise.
1.
2.
3.
4.
Part 1: Features of the Sun
Study the hydrogen-‐alpha image of the Sun below and identify and label one or more examples each of
filaments, solar prominences, sunspots, and granulation.
1. On the SOHO website, what does EIT stand for and what temperatures do the different filters image?
2. If you wanted to look at sunspots, which images would you look at on the SOHO and BBSO websites?
3. What features of the sun are best imaged with LASCO images on SOHO? Why is the occulter disk important
for these observations?
4. Describe the feature you are tracking by drawing a diagram of the Sun. Measure how far the features
moves between the two images in pixels and determine the diameter of the Sun in pixels.
Distance Traveled by Feature (pixels):
Diameter of the Sun (pixels):
5. If the images were taken a day apart, determine how long it would take for the feature to travel all the
way around the Sun. Explain your reasoning and show your work. Report your answer in days.
Part 2: Solar Cycle
1. Write down your method for determining what constitutes a sunspot in the images.
2. Fill in the chart below (label axes), and plot the number of sunspots for each year.
3. What trend do you observe? What year had the most sunspots and what year had the least number of sunspots?
4. How long did it take to go from a solar minimum to a solar maximum? How long is the solar cycle?
5. From your observations, is the Sun in solar maximum or solar minimum? If neither, where in the solar cycle is the Sun currently? What year will the Sun be in solar maximum?
Part 3: Viewing the Sun
1. Sketch the view through the Coronado Personal Solar Telescope in the box below.
2. Which type of image from the SOHO and/or BBSO websites does the view through the telescope most
resemble?
3. What layers of the Sun are you viewing with the Coronado Personal Solar Telescope?