prominences
A are gas movements above the photosphere
B can be seen only when near the solar limb
C both of the above
D none of the above
faculae are
A bright areas near sunspots
B dark lines near sunspots
C bridges connecting sunspot groups
D no choice
which of the following is not a useful time to observe the corona?
A during total solar eclipses
B anytime on an Earth satellite when the sun is visible
C soon after sunset on the equator
D no choice
the corona of the sun is only rarely visible because
A it is only visible during violent storms in the sun
B it cannot be seen through the Earth's atmosphere
C it is very faint compared to the sun's surface
D it is too hot
the 11 year solar cycle refers to
A the rate of occupance of magnetic storms on the surface of the sun
B the period of rotation of the sun
C the apparent motion of the sun across the sky
D the nuclear reactions which occur in the center of the sun
the flash spectrum is emitted by the
A photosphere
B corona
C chromosphere
D no choice
for what reason do astronomers want to observe and measure neutrinos from the sun?
A neutrinos are more energetic than photons from the sun.
B neutrinos are easier to detect than photons.
C neutrinos give direct information about the photosphere.
D neutrinos give direct information about the sun's core.
E none of the above.
two important characteristics of sunspots are
A low temperature, intense magnetic fields.
B high temperature, intense magnetic fields.
C high temperature, weak magnetic fields.
D low temperature, intense magnetic fields.
E north and south magnetic polarities.
sun spots appear dark because
A they are obscuring matter between the sun and us
B they are further away from us
C they are cooler than the rest of the sun
D no choice
the latitudes at which sunspots occur
A are the same throughout the sunspot cycle
B gradually move away from the equator during the sunspot cycle
C gradually move toward the equator during the sunspot cycle
D move first away from, then toward the equator during the cycle
the relative positions of sun spots on the surface of the sun over a period of days allow astronomers to measure
A the rotation period of the sun
B the lifetime of sunspots
C the effect of magnetic fields on sunspot positions
D no choice
the temperature of the corona is about
A 10,000 k
B 100,000 k
C 1,000,000 k
D no choice
the very faint corona cannot be observed at the surface of the Earth without special equipment because of
A scattering within the corona
B scattering within the Earth's atmosphere
C increased absorption by the Earth's atmosphere due to smog
D no choice
when viewed on the sun's surface, magnetic storms appear as
A bright flashes of light
B dark spots
C violent contortions of the entire sun
D can't be seen at all
the number of sunspots visible at anytime seems to vary with a period of
A 27 days
B 11 years
C a few hours
D no choice
the outer corona of the sun has a temperature of
A several million degrees
B several thousand degrees
C room temperature
D near absolute zero
which of the following solar phenomena is not generally associated with active regions
A flares
B sunspots
C spicules
D faculae
the k spectrum of the corona arises from
A absorption by atoms in the corona
B scattering by electrons in the corona
C scattering by atoms in interplanetary space
D no choice
which of the following devices is not used to study the sun's atmosphere?
A spectroheliograph
B coronagraph
C radio telescope
D chromograph
which of these regions of the sun has the highest temperature?
A core.
B photosphere.
C chromosphere.
D corona.
when seen in the chromosphere, sunspots appear
A brighter than their surroundings
B darker than their surroundings
C invisible
D no choice
which of the following methods cannot be used to measure the solar rotation period?
A Doppler shift of lines near the limb (edge) of the sun
B motion of sunspots across the solar disk
C motion of granulations across the solar disk
D motion of chromospheric faculae across the solar disk
the eleven year cycle of the sun refers to the
A changing brightness of the sun
B changing electrical balance of the sun
C changing frequency of magnetic storms on the surface of the sun
D period of rotation of the sun
solar granulation is seen
A only near sunspots
B only in the chromosphere
C everywhere on the sun's surface except on sunspots
D no choice
the sun's magnetic field is evident in the looped shapes of
A solar prominences.
B solar flares.
C plages.
D all of these.
sunspots are caused by
A interaction of the sun with the planets
B irregularities in the sun's magnetic field
C internal faults in the sun similar to those which cause Earthquakes
D no choice
sunspots look dark because they are
A hot coronal holes.
B regions of low hydrogen abundance.
C cooler than the photosphere.
D all of these.
the spectrum of the chromosphere is a
A bright line spectrum
B dark line spectrum with a continuum
C pure continuous spectrum
D all of the above
does the sun rotate as a solid?
A yes, because it is.
B yes, even though it is a gas.
C yes, even though it is liquid.
D no, points near the equator rotate in the least time.
E no, points near the poles rotate in the least time.
a spectroheliograph is used to obtain
A a picture of the chromosphere in only one color
B a spectrum of the chromosphere
C a moving picture of prominence activity
D no choice
sunspots are areas on the sun that are
A hotter than their surroundings.
B cooler than their surroundings.
C brighter than their surroundings.
D both (a) and (b) above.
E both (b) and (c) above.
differential rotation in the sun makes the
A equator move faster than higher latitudes.
B the higher latitudes move faster than the equator.
C the magnetic field rotate faster than the surface.
D none of these.
the spectrum of the corona is a
A bright line spectrum
B dark line spectrum with a continuum
C pure continuous spectrum
D all of the above
the eleven year cycle of magnetic storms on the sun
A does not affect the Earth at all
B affects only the magnetic field of the Earth
C affects many things on the Earth by changing the electrical balance in the atmosphere
D is a dominant effect in most biological cycles
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