Read Laboratory Exercise 6, section 4 and answer questions 22-24.
Figure 6.18
Twisted magnetic fields erupted above a sunspot on Thursday, July 18, 2002. The explosion sparked an X2-class solar flare and hurled a faint coronal mass ejection (CME). The CME arrived on July 19th and triggered a period of faint high-latitude auroras. This picture was taken by Dominic Cantin, 75 km north of Québec City, Canada July 19,2002.
Shortly thereafter, on July 20, 2002, a powerful X3-class solar flare erupted from a location just behind the Sun’s southeastern limb. The explosion, which was most intense at 21:30 UT (2:30 p.m. PDT), caused a radio blackout across North America and the Pacific Ocean.
Figure 6.19
Below is a Hydrogen Alpha spectroheliogram from the Big Bear Solar Observatory (BBSO). The arrow points in the direction of strong X-Ray emission recorded in the graph below.
Figure 6.20
This is a time sequence of SOHO-MDI images of the sun with sunspot labels. They were taken after the 7/20/2002 flare. What is the label of the Sunspot responsible for the July 20th event?
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July 21, 2002
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July 22, 2002
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July 23, 2002
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July 24, 2002
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July 25, 2002
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