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.

You are free to take this quiz based on the lecture at any time.

To improve your score feel free to read the lecture Solar cycles, See also, External links and the various links included in the template.

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Enjoy learning by doing!

Quiz
{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
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{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%.
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{During the late 1600s the sunspot cycle lost its usual intensity and became what? { Maunder Minimum (i) }
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{True or False, Naked sunspots seen in Hα which are devoid of plage are never associated with coronal holes. - TRUE + FALSE
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{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
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{Complete the text: Early spectroscopy of the Sun using estimates of the { intensity|line intensities (i) } of several lines by eye to derive the { abundance|abundances (i) } of elements concluded that the { Sun (i) } is largely made of { hydrogen|H (i) }.
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{When faculae are present, what characteristics are readily observed? + bright spots + bright patches + granules + temporary increases in TSI + arising between granules - neon clouds
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{In each latitudinal hemisphere for the greater part of the sunspot period there is practically but one what? { zone (i) }
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{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
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{In general there is no proper motion at all in the plage or the surrounding? { plagettes (i) }
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{True or False, "Some prominences break apart and give rise to coronal mass ejections." + TRUE - FALSE
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{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
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{Complete the text: "When a prominence is viewed from a different perspective so that it is against the { Sun|sun|star (i) } instead of against space, it appears { dark|darker (i) } than the surrounding { background (i) }.
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{True or False, In 1947, G. E. Kron proposed that starspots were the reason for periodic changes in brightness on blue dwarfs. - TRUE + FALSE
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{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
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{A Mt. Wilson spot number usually corresponds with which other region number? { Hale|McMath|Big Bear (i) }
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{True or False, Hale region numbers are greater for the same regions than NOAA numbers. + TRUE - FALSE
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{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
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{Solar observation is performed all around the surface of the Earth by? { location (i) }
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{True or False, The Kodaikanal Solar Observatory is a solar observatory owned and operated by the Indian Institute of Astrophysics. + TRUE - FALSE
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{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
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{Naked spots are long-lived and show rotation rates close to what? { Newton-Nunn curve (i) }
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{True or False, Helicity (H) is a quantitative measure of the chiral properties of the structures observed in the solar atmosphere. + TRUE - FALSE
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{Which of the following are associated with the Sun control group? - rocky objects + gaseous objects + plasma objects + a photosphere + rotation - watery surface + spots
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{The relative abundances of solar cosmic rays reflect those of the solar { photosphere (i) }
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{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
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{Using a coordinate system, sunspot passage is generally noted by what meridian? { central|central meridian (i) }
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{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
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{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
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{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? { the core|core (i) }
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{True or False, X-ray photons can be effectively backscattered by photosphere atoms and electrons. + TRUE - FALSE
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{Which of the following are photospheric observatories on Earth? - Chandra X-ray Observatory + Big Bear - TRACE + Kodaikanal - the Hubble + Lomnický štít + McMath-Pierce - SOFIA
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{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
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{About one third of solar ejecta observed by satellites at Earth is composed of what? { magnetic clouds (i) }
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{True or False, A spotless flare may occur in a plage region during its first rotation. + TRUE - FALSE
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{Which of the following are solar observatory satellites? - Einstein Observatory + OSO 7 + Hinode - High Energy Astronomy Observatory 1 + Koronas-Foton + STEREO
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{Suborbital solar probing may be accomplished from different geographical locations using? { sounding rockets|aircraft|balloons|rockets (i) }
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{True or False, Heliography is the geography of the Sun. + TRUE - FALSE
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{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
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{True or False, The Sun has a net positive charge on its surface. - TRUE + FALSE
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Hypotheses

 * 1) The solar cycle has its origin in the impinging electrons coming in from the various planets.