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GCSE EDEXCEL Astronomy (paper 2 ONLY) > 10) Solar Astronomy ✅ > Flashcards

10) Solar Astronomy ✅ Flashcards

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1
Q

What are some ways of observing the sun safely?

A
  • Telescopic projection
  • H-Alpha filter
  • Pinhole projection
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2
Q

Describe what the Telescopic projection method is

A

Requires the use of a ‘baffle’ to absorb most of the solar radiation before entering the telescope

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3
Q

Describe what the H-alpha filter method is

A

The H-Alpha filter absorbs all sunlight apart from a very narrow range of wavelengths centred on a particular spectral line of hydrogen

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4
Q

What are sunspots?

A

Sunspots are cooler areas of the Photosphere where the Sun’s magnetic field rises from below the Sun’s surface and the magnetic regions poke through. They are darker in colour as they are expending less energy and have a lower temperature

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5
Q

What is the average temperature of a Sunspot?

A

Umbra is ~3800K

Penumbra is ~5600K

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6
Q

How can you calculate solar rotation period?

A

If the difference in longitude (ΔL) of a sunspot occurs in a time interval, then rotation period (T) can be calculated by:
T . . 360°
—- = ——
Δt . . ΔL

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7
Q

What is the earliest Nuclear Fusion?

A

The earliest Nuclear Fusion is when hydrogen (H) nuclei fuse into Helium (He) nuclei.

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8
Q

Why can Nuclear Fusion only happen in the Sun’s core?

A

The temperature has to be high enough to overcome the mutual electrostatic repulsion of the positively-charged nuclei

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9
Q

What is the chain of reaction that happens in the Sun?

A

The Proton-Proton or Deuterium-Deuterium chain

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10
Q

What happens in each stage in the proton-proton chain?

A

At each stage in the chain, mass (m) is lost and converted into energy (E). This is in accordance with Einstein’s equation E=mc², where c is the speed of light

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11
Q

What is the order of the sun’s internal divisions?

A

core –> radiative zone –> convection zone –> photosphere –> chromosphere –> corona

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12
Q

How much mass does the Sun lose?

A

The Sun loses 4 million tonnes of mass every second, this is insignificant as the Sun’s total mass is 2.0 × 10²⁷ tonnes

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13
Q

What is the zone above the Sun’s core?

A

Radiative zone

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14
Q

What happens in the radiative zone?

A

This zone is where the energy in the form of photons (gamma-radiation) is transferred in a random manner due to the scattering of photons by electrons outwards

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15
Q

What is the zone outside the radiative zone?

A

The convection zone

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16
Q

How thick is the convection zone?

A

~200 000 km

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17
Q

What happens in the convection zone?

A

The convection zone is where the thermal energy is transported to the photosphere by rising convection currents of hot plasma.

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18
Q

What is at the top of the convection zone?

A

The photosphere

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19
Q

How hot is the photosphere?

A

The photosphere is ~2 million K at the base. At the visible part of the photosphere, the temperature is 5800 K

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20
Q

How thick is the photosphere?

A

100 km

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21
Q

How does the Sun’s photosphere radiate energy?

A

The Sun radiates energy in the form of visible light but also to a lesser extent of infra-red, ultra-violet and X-Radiation

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22
Q

What are the parts of the Sun’s atmosphere?

A

The chromosphere and corona

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23
Q

How thick is the chromosphere?

A

2000 km thick

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24
Q

How hot is the chromosphere?

A

400 K - 100 000 K at the top

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25
How hot is the corona?
2 million K
26
How far can the corona extend?
The corona can extend outwards for millions of km into space
27
What is 'slow' solar wind?
An outflow of charged particles (mostly protons and electrons)
28
Where does 'slow' solar wind come from?
The Corona
29
What is the speed of 'slow' solar wind?
~400 km/s
30
Where does 'fast' solar wind originate from?
Coronal holes
31
What is 'fast' solar wind associated with?
Coronal mass ejections and Solar Flares
32
What are the effects of solar wind?
- Aurora - Creation of cometary tails - Geomagnetic storms - Other (radiation poisoning to astronauts, affecting radio communication of aircraft)
33
What is geomagnetic storms? And what happens during it?
A temporary disturbance in the magnetic field surrounding Earth. It can cause disturbances with electrical systems on Earth
34
What is the Butterfly Diagram?
The butterfly diagram is a diagram that shows the solar cycle of sunspots. The cycle begins with a few spots at mid latitude. The numbers of sunspots fall and rises, and they drift towards the solar equator
35
How long does the solar cycle last?
11 years
36
What is a Type II Supernova?
A Red Supergiant collapses
37
What is a Type Ia Supernova?
A Type Ia Supernova occurs when Red Giant star is in a binary system with a white dwarf. Over time, the white dwarf will gravitationally steal matter from the Red Giant, resulting in the increase of mass. It will surpass the Chandrasekhar limit and the electron degeneracy pressure will be insignificant in preventing the collapse, resulting in a supernova
38
What stage of a star does a planetary nebula represent?
Death
39
What is Fast solar wind?
A build up of of magnetic energy which is released from a sunspot
40
Where does slow solar wind originate from?
The suns corona
41
What is slow solar wind?
Particles that are emitted from all over the Sun. They are slowed by the magnetic fields of the Sun They are mostly charged protons and electrons
42
What is the speed of slow solar wind?
400 km/s
43
When is there more fast solar wind?
During the middle of a Sunspot cycle where there are the most amount of Sunspots
44
Why does Nuclear fusion only take place in the Sun's core?
The particles need to be hot enough to withstand the electric repulsive forces. They have to hit each other fast so they need to be at very high pressure (15 Million Kelvin)
45
What are sunspots?
Sunspots are black spots on the surface of the Sun that are formed where the the magnetic field leaves the surface. It is a cool area where no convection occurs
46
What prevents the ionising rays from reaching the surface of the Earth?
Magnetosphere
47
What is the equation that tells you how to find longitude in the UK?
Local Mean Time - Mean Solar Time In Greenwich _______________________________________ . . . . . . . . . . . . . . . . . . . . . . . 4 =Degrees of Longitude to the East
48
What is the First Umbral Contact for a solar eclipse?
The First Umbral Contact is when the Moon starts to cover the Sun
49
What is the Second Umbral Contact for a solar eclipse?
The second Umbral contact is when the Moon has just finished covering the Sun
50
What is the Third Umbral contact for a solar eclipse?
The Moon is on the cusp of leaving the Umbra of the Sun
51
What is the Fourth Umbral Contact for a solar eclipse?
The fourth Umbral Contact is when the Moon has just left the Sun
52
What is an Annular solar eclipse?
When the Moon is too small to fully cover the Sun so a ring of light surround the Sun
53
Why does an Annular Solar eclipse occur?
An Annual Solar Eclipse occurs when the Moon's orbit is in an apogee and the the Moon appears to small to cover the entire Sun compared to normal eclipses.
54
What is an accretion disk?
An accretion disk consists of hot, swirling gas captured by a white dwarf ( or neutron star or black hole ) from a binary companion star.
55
When can white dwarf supernova occur?
A white dwarf supernova can occur only in a binary system, and all such events are thought to have the same luminosity.
56
What are the Sun's internal divisions in order?
Photosphere Convection zone Radiative zone Core
57
How does a H-alpha filter make the observation of the Sun safe?
A H-alpha filter makes the observation of the Sun safe as the intensity of light received from the Sun is reduced
58
Where does the Sun rotate faster?
The Sun rotates faster at the equator then the poles
59
How hot is the Corona?
2 million K
60
How hot is the Core of the Sun?
15 million K
61
How hot is the photosphere?
5800 K
62
How hot is the top of the Chromosphere?
100 000 K
63
How hot is a typical Sunspot Umbra?
3800 K
64
How hot is a typical Sunspot Penumbra?
5600 K
65
How hot is a typical Sunspot Radiative zone?
2,000,000 K
66
How hot is the Convection zone?
5,800
67
What is the structure of a sunspot?
68
How do the Van allen belts look like?
69
What is the altitude of the inner Van Allen belt?
1,500km - 10,000km
70
What is the altitude of the outer Van Allen belt?
15,000km - 65,000km
71
Inner belt contains...
trapped protons
72
Outer belt contains...
trapped electrons
73
What is the Earth's magnetic field caused by?
Earth’s large iron core and the rotation of the Earth
74
What is a magnetosphere?
The region around a planet dominated by the planet's magnetic field.
75
When is the sun's corona only visible?
During an eclipse
76
How does observing the sun in different wavelengths allow us to study the sun better?
Optical filters are attached to a telescope allowing the observer to study the Sun. Without these observations it would be difficult to study sunspots in great detail, flares or even the surface of the Sun with accuracy.
77
What is geomagnetic storms? And what happens during it?
A temporary disturbance in the magnetic field surrounding Earth.
78
What is Deuterium?
An isotope of Hydrogen
79
What is the first stage of the PROTON PROTON cycle?
2 protons fuse to form Deuterium (A neutrino and positron is given out )
80
What is the second stage of the PROTON PROTON cycle?
Deuterium fuses with a proton to make Helium-3
81
What is the third stage of the PROTON PROTON cycle?
2 Helium-3s fuse to form a helium-4 and 2 protons

GCSE EDEXCEL Astronomy (paper 2 ONLY) (9 decks)

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