Sunspots, the solar cycle and space weather

Grade 9 Science Worksheet

Circle the best answer.

1. 1.

   Sunspot drawing: 3 groups, 14 spots in all. Bo counts 3 sunspot groups with 14 spots in all. What is the sunspot number (10 × groups + spots, NOAA)?

   • 30, from the groups alone
   • 140, ten for each spot
   • 17, adding groups and spots
   • 44
2. 2.

   5 groups, 22 spots in all. Esme counts 5 sunspot groups with 22 spots in all. What is the sunspot number?

   • 27, adding groups and spots
   • 220, ten for each spot
   • 50, from the groups alone
   • 72
3. 3.

   a blank solar disk. For a week, Jun sees no sunspot groups and no spots. What does this suggest?

   • The Sun is near solar minimum
   • The solar cycle has stopped for good
   • Sunspots are hiding behind brighter spots
   • The Sun is at solar maximum
4. 4.

   NOAA says Cycle 25 began in December 2019. If it lasts about 11 years, about when should it end, by Luz's math?

   • Around 2030
   • Around 2025, at maximum
   • Around 2041
   • Around 2020
5. 5.

   Near solar maximum, satellites in low orbit slow down faster. Why, by Milo's reading (NOAA)?

   • The upper atmosphere shrinks at maximum
   • Satellites run out of fuel faster in sunlight
   • The Sun heats the upper air, lifting denser air to their height
   • Sunspots pull satellites with gravity

6. Read this first

   NOAA G scale

   Level	Kp	Average per 11-year cycle
   G1	5	1,700
   G3	7	200
   G5	9	4

7. 6.

   A storm measures Kp = 7. Which G level is it, by Noah's reading?

   • G1, minor
   • G5, extreme
   • G7
   • G3, strong
8. 7.

   About how many G5 storms happen in an average 11-year cycle, by Pia's reading?

   • About 4
   • About 200
   • They do not happen
   • About 1,700, like G1

9. How far auroras reach (NOAA)

   Level	States	Geomagnetic latitude
   G3	Illinois and Oregon	about 50°
   G5	Florida and southern Texas	about 40°

10. 8.

    NOAA: G3 auroras have reached Illinois and Oregon (about 50° geomagnetic latitude); G5 auroras, Florida and southern Texas (about 40°). As storms grow, where do auroras go, by Ren's reading?

    • They stay at the same latitude
    • Onto Earth's daytime side
    • Toward the equator, to lower latitudes
    • Toward the poles
11. 9.

    How can a geomagnetic storm affect long power lines, by Tala's reading (NOAA)?

    • Changing magnetic fields induce extra currents in the lines
    • Sunspots heat the wires directly
    • Auroras strike the lines like lightning
    • Flare light melts the wires
12. 10.

    A flare's X-rays cause a high-frequency radio blackout. Where on Earth, by Zee's reading (NOAA)?

    • On the night side, away from the Sun
    • In underground cables
    • Everywhere, three days later
    • On the sunlit side, in high-frequency radio