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ast 203 > The Sun > Flashcards

The Sun Flashcards

1
Q

Energy produced via thermonuclear reactions

A

The core

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2
Q

Transports energy outwards

A

Radiative and convective layers

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3
Q

Lower part of solar atmosphere (surface we see)

A

Photosphere

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4
Q

10^4 km thick layer above photosphere; characteristic red color

A

Chromosphere

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5
Q

Absorption results from

A

Bound free process

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6
Q

Light areas of the sun that’s surrounded by darker areas

A

Solar granules/granulation

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7
Q

Broadening of spectral lines due to the Doppler shift

A

Doppler broadening

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8
Q

Atoms in photosphere have random motions due to their…

A

Thermal energy

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9
Q

Optically thin layer of the sun

A

Chromosphere

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10
Q

Strong H-alpha emissions during eclipse

A

Chromosphere

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11
Q

Larger versions of granules

A

Super granules

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12
Q

Layer above chromosphere (very small optical depth due to rarefied gas)

A

Corona

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13
Q

Photons pass from the photosphere to _____ without doing any heating

A

Corona

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14
Q

Slightly cooler regions of the sun, associated with regions of enhanced magnetic fields (occur in pairs)

A

Sunspots

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15
Q

Number of sunspots vary on an ___ year period

A

11 (higher latitudes/opposite poles at start of 11 yr. cycle)

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16
Q

Period of very little observed sunspot activity

A

Maunder minimum

17
Q

Splitting of atomic energy levels when atom is in magnetic field

A

Zeeman effect

18
Q

Where does the sun generate magnetic field?

A

Close to the surface

19
Q

Energetic ejection of particles seen in H-alpha (lasts minutes-hours)

A

Solar Flares

20
Q

Stream of particles moving outward from Sun

A

Solar wind

21
Q

Result of solar wind on Earth

A

Aurora (northern lights)

22
Q

Outward dance of absorption and re-emission

A

Radiation transport theory

ast 203 (12 decks)

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