Stars/Sun/Solar cycles/Quiz

At right is a montage of ten years' worth of Yohkoh SXT images, demonstrating the variation in solar activity during a sunspot cycle, from after August 30, 1991, to September 6, 2001.

Solar cycles is a lecture about the solar cycles of the Sun.

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1 Quiz
2 Hypotheses
3 See also
4 External links

Quiz

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1 True or False, The Norikura Solar Observatory uses its own designations for solar active regions rather than those of other observatories or NOAA.

	TRUE
	FALSE

2 Which of the following is not a characteristic of solar active regions?

	lithium
	nucleosynthesis
	coronal clouds
	spot central meridian passage
	a surface coverage of at least 95%.

3 During the late 1600s the sunspot cycle lost its usual intensity and became what?

4 True or False, Naked sunspots seen in Hα which are devoid of plage are never associated with coronal holes.

	TRUE
	FALSE

5 The Sun as a star has what geographical property?

	it's a primordial population III star
	it passes once a year across the Lockman Hole
	silicates have been discovered in its interior structure
	optical reflectance studies have found evidence of magnesium
	it has a surface temperature of ~700 K
	it has a longitude and latitude grid system for locating surface features

6 Complete the text:

Early spectroscopy of the Sun using estimates of the

of several lines by eye to derive the

of elements concluded that the

is largely made of

7 When faculae are present, what characteristics are readily observed?

	bright spots
	bright patches
	granules
	temporary increases in TSI
	arising between granules
	neon clouds

8 In each latitudinal hemisphere for the greater part of the sunspot period there is practically but one what?

9 Which of the following is not a prominent feature associated with solar clouds?

	coronal mass ejections
	magnetic clouds
	rotation
	coronal clouds
	plasma
	magnetic field lines

10 In general there is no proper motion at all in the plage or the surrounding?

11 True or False, "Some prominences break apart and give rise to coronal mass ejections."

	TRUE
	FALSE

12 Which of the following is not a phenomenon usually associated with sunspots?

	solar photosphere
	a hole in the granulated photosphere
	production of ⁷Be
	rotation
	solar cycle
	starspots
	flip-flop cycle

13 Complete the text:

"When a prominence is viewed from a different perspective so that it is against the

instead of against space, it appears

than the surrounding

14 True or False, In 1947, G. E. Kron proposed that starspots were the reason for periodic changes in brightness on blue dwarfs.

	TRUE
	FALSE

15 Which of the following is not a phenomenon associated with a flip-flop cycle?

	active regions
	hemisphere shifts
	binary RS CVn stars
	single stars
	cyclical period
	meridian passage

16 A Mt. Wilson spot number usually corresponds with which other region number?

17 True or False, Hale region numbers are greater for the same regions than NOAA numbers.

	TRUE
	FALSE

18 Which of the following sunspot phenomena are associated with the Maunder minimum?

	extensively long quiet Sun
	lowest ¹⁴C concentration from as far back as 1100 BP.
	a period of lower-than-average European temperatures
	a surface coverage of about 88%
	only about 50 sunspots during one 30-year period
	11-year cycles

19 Solar observation is performed all around the surface of the Earth by?

20 True or False, The Kodaikanal Solar Observatory is a solar observatory owned and operated by the Indian Institute of Astrophysics.

	TRUE
	FALSE

21 Which of the following are phenomena usually associated with a heliostat?

	geographic coordinates
	a mirror which turns so as to keep reflecting sunlight toward a predetermined target
	the target is usually stationary
	computer control
	a two-axis motorized system
	altitude

22 Naked spots are long-lived and show rotation rates close to what?

23 True or False, Helicity (H) is a quantitative measure of the chiral properties of the structures observed in the solar atmosphere.

	TRUE
	FALSE

24 Which of the following are associated with the Sun control group?

	rocky objects
	gaseous objects
	plasma objects
	a photosphere
	rotation
	watery surface
	spots

25 The relative abundances of solar cosmic rays reflect those of the solar

26 Which of the following are characteristic of solar proton astronomy?

	the solar wind
	polar coronal holes
	protons originating from the photosphere
	the electron neutrino
	GOES 11
	neutrons

27 Using a coordinate system, sunspot passage is generally noted by what meridian?

28 True or False, "75% of the naked sunspots represented the return of large dominant f spots which had been part of large active regions during previous rotations."

	TRUE
	FALSE

29 Which geographical phenomena are associated with sunspots?

	moving across the surface of the Sun
	manifesting intense magnetic fields
	a north geographic and magnetic pole
	rotation
	a prime meridian
	average sunspot latitudes
	the solar equator

30 Neutrinos detected from the solar octant may be from nucleosynthesis within the coronal cloud in the near vicinity of the Sun or perhaps from nucleosynthesis occurring within what theoretical interior structure of the Sun?

31 True or False, X-ray photons can be effectively backscattered by photosphere atoms and electrons.

	TRUE
	FALSE

32 Which of the following are photospheric observatories on Earth?

	Chandra X-ray Observatory
	Big Bear
	TRACE
	Kodaikanal
	the Hubble
	Lomnický štít
	McMath-Pierce
	SOFIA

33 Which of the following observatories are solar observatories?

	The Huairou Solar Observing Station in China
	Mauna Loa Solar Observatory
	Los Alamos National Solar Laboratory
	National Solar Observatory
	Mees Solar Observatory
	CERN

34 About one third of solar ejecta observed by satellites at Earth is composed of what?

35 True or False, A spotless flare may occur in a plage region during its first rotation.

	TRUE
	FALSE

36 Which of the following are solar observatory satellites?

	Einstein Observatory
	OSO 7
	Hinode
	High Energy Astronomy Observatory 1
	Koronas-Foton
	STEREO

37 Suborbital solar probing may be accomplished from different geographical locations using?

38 True or False, Heliography is the geography of the Sun.

	TRUE
	FALSE

39 Which of the following are green radiation astronomy phenomena associated with the Sun?

	the color of the upper rim as seen from Earth
	an excess brightness at or near the edge of the Sun
	the iron XIV green line
	neutron emission
	polar coronal holes
	meteor emission
	changes in the line-blanketing