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Astronomy > Solar Astronomy > Flashcards

Solar Astronomy Flashcards

1
Q

What is the temperature of the photosphere?

A

5800K

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2
Q

What temperature is the umbra?

A

3800K

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3
Q

What is the temperature of the penumbra

A

5600K

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4
Q

What is the temperature of the Sun’s core?

A

15mill K

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5
Q

Where does the Proton Proton chain occur in the Sun?

A

The Core of the Earth is where the proton proton chain and other thermonuclear reactions occur as it has a very high temperature and high pressure.

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6
Q

In which part of the Sun is where Sunspots is located?

A

Photosphere.

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7
Q

How are sunspots formed?

A

They are formed by rips in the magnetic field

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8
Q

Name 2 ways to observe the Sun safely?

A

H-Alpha filter: Absorbs all sunlight

Telescopic Projecting: Use a card with a small hole to absorb most of the solar radiation before it enters the telescope.

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9
Q

What is the use of the convective zone of the Sun?

A

Where thermal energy is transported to the photosphere by rising convection currents of hot plasma.

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10
Q

What is the temperature of the corona?

A

2mill K

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11
Q

What is the temperature of the chromosphere?

A

4000K-8000K

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12
Q

What is a Solar Wind?

A

Solar wind is the outflow of charged particles from the Sun’s corona ejected into space.

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13
Q

What is temperature of the convective zone?

A

5700K - 2000000K

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14
Q

What are geomagnetic storms?

A

Coronal mass ejections that interfere with the Earth’s magnetosphere.

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15
Q

How long is the Solar rotation period( Usually )?

A

24.5 days at the equator

38 days at the poles

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16
Q

How do you determine solar rotation periods with sunspots?

A

Time how long it takes for a sunspot to move across the surface of the solar disc.

Double it

17
Q

What are comet tails?

A

Solar wind ionises gases from comets.

The gases glow forming comet tails.

18
Q

What is van allan belts?

A

2 regions of intense radiation partly surrounding the earth.

19
Q

Name 3 facts of sunspots.

A
  • Sunspots expand and contract as they move across the solar disc.

-They move along lines of latitude left to right

  • Convection inhibited by concentrations of magnetic flux.
20
Q

Why do sunspots appear more frequent at the equator?

A

Because at the equator the surface rotates at a faster rate than the poles meaning the sun has its magnetic field ripped near the equator forming a sunspot.

21
Q

Where are white dwarfs on a HR diagram?

A

White dwarfs are on the bottom left of the HR diagram

22
Q

What are the two labelled axis on a HR diagram?

A

Luminosity and Surface temperature.

23
Q

What can HR diagram help us find?

A

Absolute magnitude and distance.

24
Q

What do black lines tell us in a stellar spectra?

A

Black lines on a stellar spectra shows there are missing wavelengths

25
Q

What does absorption lines tell us in a stellar spectra.

A

Absorption lines tell us what elements are present in a star.

26
Q

What type of star is our star using OBAFGKM.

A

Our sun is a G2 star.

27
Q

What is the life cycle of a star on a HR Diagram?

A

1.Nebula
2.Protostar
3.Main Sequence star
4.Red giant
5.White dwarf
6.Black dwarf

28
Q

Name 3 ways to find distance of stars or galaxies.

A
  1. If we know absolute magnitude and apparent magnitude we can calculate the distance.

2.If we know spectral type we can use its position on the HR Diagram.

  1. For distant galaxies we can use red shift.
29
Q

How many light years is in 1 parsec?

A

1pc = 3.26 light years

30
Q

What 2 types of radiation can get through the earths atmosphere?

(hint EM spectrum)

A

Visible light
Radio Waves

Others also can but not completely.

31
Q

What is the benefit of having a bigger dish on a radio telescope.

A

Having a bigger dish means having a better resolution.

32
Q

What are the benefits of having an array of smaller radio telescopes then having 1 larger one?

A

Cheaper.

It creates a larger aperture.

33
Q

What can radio telescopes be used for?

A

Quasar Sightings

Jets from black holes

Structure of the milky way

Proto planetary disks

Astronomy (8 decks)

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