Sunspots, the solar cycle and space weather

Grade 9 Science Worksheet - Challenge Me

Circle the best answer.

1. 1.

   SWPC sees a fast CME leave the Sun toward Earth. About how much warning can that give, by Esme's reading (NOAA)?

   • About 15 hours to a few days
   • About 8 minutes, at light speed
   • About 11 years
   • No warning; CMEs arrive at once

2. Read this first

   NOAA G4 (severe)

   System	Possible effect
   power systems	voltage control problems
   spacecraft	surface charging and tracking problems
   aurora	seen as low as Alabama and northern California

3. 2.

   SWPC issues a G4 storm watch. Who uses it, and how, by Jun's reading?

   • Farmers protect crops from the heat
   • Sky watchers in Alaska expect fewer auroras than usual
   • Grid and satellite operators prepare their systems
   • People board up windows against wind
4. 3.

   Map of the United States with the G1 aurora line across northern Michigan and Maine. A G1 storm is forecast. One cousin lives in northern Maine, another in Florida. Who is more likely to see an aurora, by Kira's reading (NOAA)?

   • Neither; auroras need a G5 storm
   • Both, equally
   • The cousin in Florida, since G1 pushes auroras south
   • The cousin in northern Maine

5. Sun surface temperatures (NOAA)

   Region	Temperature
   sunspot center	about 7,000 °F
   photosphere	about 10,000 °F

6. 4.

   Luz's friend says sunspots are the hottest parts of the Sun's surface. Which response is best (NOAA)?

   • Disagree: sunspots are holes into a cold core
   • Agree: magnetic fields make them hottest
   • Disagree: at about 7,000 °F they are cooler than the surface around them
   • Agree: darker means hotter
7. 5.

   Milo's cousin says auroras are sunlight reflecting off Arctic ice. Which response is best (NOAA)?

   • Agree: that is why they are near the poles
   • Agree: they are brightest at noon
   • Disagree: they are city lights on clouds
   • Disagree: electrons striking gas 80 to 500 km up make them glow
8. 6.

   Noah's friend says solar maximum is when the Sun has the fewest sunspots. Which response is best?

   • Agree: the Sun is quietest at maximum
   • Disagree: sunspot numbers stay level through the cycle
   • Disagree: maximum is the peak of sunspot activity
   • Agree: maximum comes once a year

9. NOAA G scale

   Level	Average per 11-year cycle
   G1	1,700
   G5	4

10. 7.

    NOAA's averages are about 1,700 G1 storms and about 4 G5 storms per 11-year cycle. About how many G1 storms are there for each G5, by Pia's math?

    • About 0.002, since G5 storms are more common
    • About 1,700
    • About 425
    • About 4
11. 8.

    150 million km; CME speed 750 km/s. A CME travels 150 million km at 750 km/s. About how long does it take to reach Earth, by Tala's math?

    • About 8 minutes
    • About 56 days
    • About 2.3 days
    • About 5.6 hours
12. 9.

    NOAA says fast-changing magnetic fields in sunspot groups are the likeliest sources of flares and CMEs. Which prediction fits solar maximum, by Ari's reading?

    • More flares at minimum, when spots are fewest
    • More flares and CMEs, so more space weather
    • No change; flares do not depend on sunspots
    • Fewer flares, since sunspots are hot
13. 10.

    Four lists, labeled A to D. Which list names what space weather mostly affects, by Bo's reading (NOAA)?

    • Power grids, satellites, radio and GPS
    • Rain, snow and wind
    • Ocean tides and waves
    • Earthquakes and volcanoes