IU AST-A100 EXAM 2 LATEST
How long is the sunspot cycle? - ANSWERS-every 7 years
Solar flares - ANSWERS-Violent, rapid eruptions of material from the
surface of the Sun
Occurs when magnetic fields interact and destroy each other
Spectra (spectrum) - ANSWERS-Light separated into constituent
wavelengths using a prism
Tells you what wavelengths are absorbed or emitted (tells you the
composition of the gas)
Absorption spectrum - ANSWERS-absorption lines show the
composition of the photosphere and chromosphere
gives info about temp and density
Spicules - ANSWERS-Spikes of gas in the chromosphere of the Sun
Expand from chromosphere to the corona
About 3,000 spicules on the Sun at any given time
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, IU AST-A100 EXAM 2 LATEST
Corona - ANSWERS-Aura of x-ray light emission that is released
around the Sun
Outer edge bleeds into the solar wind
Solar wind - ANSWERS-A stream of electrically charged particles
produced by the sun's corona
The Earth is somewhat protected from solar wind
Exoplanet - ANSWERS-A planet that orbits a star outside the solar
system
3728 exoplanets have been discovered
Transit method - ANSWERS-detecting exoplanets by observing the
change in brightness as the planet eclipses the star.
Causes a dip in the light curve
Can find radius, density, atmospheric temp and density, and orbit
inclination and density
Doppler Method - ANSWERS-Motion affects how waves behave
Easier to detect close, massive planets
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2
, IU AST-A100 EXAM 2 LATEST
Source approaching: waves crests are shorter and closer together, blue
shift
Source receding: wave crests are taller and further apart, red shift
Can find mass, density, orbital period, orbital distance, and orbital
eccentricity
Direct Detection Method - ANSWERS-Taking infrared pictures of
nearby planetary systems
Works best with young gas giants with larger distances from the sun
The Frontier - ANSWERS-Area with low mass planets and long orbital
periods
Hard to study orbits of 100s of days
Low mass planets have small wobbles that are hard to detect
James Webb Space Telescope (JWST) - ANSWERS-Will provide high-
res infrared pictures images
Launching in 2019
L-T Diagram - ANSWERS-luminosity-temp diagram
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3
How long is the sunspot cycle? - ANSWERS-every 7 years
Solar flares - ANSWERS-Violent, rapid eruptions of material from the
surface of the Sun
Occurs when magnetic fields interact and destroy each other
Spectra (spectrum) - ANSWERS-Light separated into constituent
wavelengths using a prism
Tells you what wavelengths are absorbed or emitted (tells you the
composition of the gas)
Absorption spectrum - ANSWERS-absorption lines show the
composition of the photosphere and chromosphere
gives info about temp and density
Spicules - ANSWERS-Spikes of gas in the chromosphere of the Sun
Expand from chromosphere to the corona
About 3,000 spicules on the Sun at any given time
END OF
PAGE
1
, IU AST-A100 EXAM 2 LATEST
Corona - ANSWERS-Aura of x-ray light emission that is released
around the Sun
Outer edge bleeds into the solar wind
Solar wind - ANSWERS-A stream of electrically charged particles
produced by the sun's corona
The Earth is somewhat protected from solar wind
Exoplanet - ANSWERS-A planet that orbits a star outside the solar
system
3728 exoplanets have been discovered
Transit method - ANSWERS-detecting exoplanets by observing the
change in brightness as the planet eclipses the star.
Causes a dip in the light curve
Can find radius, density, atmospheric temp and density, and orbit
inclination and density
Doppler Method - ANSWERS-Motion affects how waves behave
Easier to detect close, massive planets
END OF
PAGE
2
, IU AST-A100 EXAM 2 LATEST
Source approaching: waves crests are shorter and closer together, blue
shift
Source receding: wave crests are taller and further apart, red shift
Can find mass, density, orbital period, orbital distance, and orbital
eccentricity
Direct Detection Method - ANSWERS-Taking infrared pictures of
nearby planetary systems
Works best with young gas giants with larger distances from the sun
The Frontier - ANSWERS-Area with low mass planets and long orbital
periods
Hard to study orbits of 100s of days
Low mass planets have small wobbles that are hard to detect
James Webb Space Telescope (JWST) - ANSWERS-Will provide high-
res infrared pictures images
Launching in 2019
L-T Diagram - ANSWERS-luminosity-temp diagram
END OF
PAGE
3
