Magnetism of the Sun/ PaleoMagnetism

Question 1

Intense magnetic field of the sun is associated with

Answer 1

Sunspots

Question 2

Sunspots also emit hydrogen gas called

Answer 2

Solar Flares

Question 3

is a plasma which is an ionized gas.

Answer 3

SOlar wind

Question 4

interaction of the solar wind with the Earth’s magnetic field forms the

Answer 4

Magnetosphere

Question 5

The
outer boundary of the magnetosphere is the

Answer 5

Bow shock

Question 6

a region of turbulent motion

Answer 6

Magnetosheath

Question 7

The geomagnetic field
stretches out on the night side of the Earth forming the

Answer 7

Magnetotail

Question 8

boundary between the
Earth’s magnetic field and the solar wind is the

Answer 8

Magnetopause

Question 9

The charged particles that penetrate the magnetopause and are trapped by the Earth’s
magnetic field form the

Answer 9

Van Allen Radiation Belts

Question 10

Energetic particles cause ionization of molecules of nitrogen and oxygen in the atmosphere
forming an ionized region called the

Answer 10

Ionosphere

Question 11

The ionosphere is located at an altitude of
about

Answer 11

50 km and 1500 km.

Question 12

T or F: direction of remanent
magnetization was that of the geomagnetic field during cooling.

Answer 12

True

Question 13

The apparatus consists of two identical small magnets mounted horizontally at opposite ends of a short
rigid vertical bar so that the magnets are oriented exactly antiparallel to each other.

Answer 13

astatic magnetometer.

Question 14

is the study of the geomagnetic field recorded in dateable historic artefacts.

Answer 14

Archaeomagnetism

Question 15

This imaginary magnet has its north pole near the geographic South Pole and its south pole near the geographic North Pole, roughly aligned with the Earth’s rotation axis.

Answer 15

Axial Geocentric Dipole

Question 16

Axial Geocentric Dipole

Answer 16

Axial Geocentric Dipole

Question 17

if data are averaged over a long enough interval
of time, the mean paleomagnetic pole position will coincide with the axis of rotation of the Earth.

Answer 17

axial geocentric dipole hypothesis

Question 18

it is
possible to calculate where the geomagnetic pole would need to be to produce the observed declination
and inclination.

Answer 18

Virtual Geomagnetic Pole

Question 19

If samples are measured from a large number of recent lava flows covering a long enough period of time,
the mean direction of the collection will correspond to the field of an

Answer 19

axial geocentric dipole

Question 20

Pole representing an averaged value of the field, is called

Answer 20

Paleomagnetic Pole

Question 21

_________of a rock
was acquired at the time of formation of the rock (or at a known time in its history), and has since remained
unaltered.

Answer 21

natural remanent magnetization (NRM)

Question 22

Laboratory techniques must be applied that eliminate the undesirable components and isolate the
primary magnetization. This process is called __________

Answer 22

Magnetic Cleaning

Question 23

This type of magnetic cleaning can be produced in a coil by passing an alternating current through it.

Answer 23

alternating magnetic field

Question 24

when a rock sample is heated to a given temperature T, magnetic components that have lower
blocking temperatures than T are _________

Answer 24

Thermally Randomized

Question 25

T or F: paleomagnetic sampling includes a field test that can establish the stability of the demagnetization over geological time.

Answer 25

False

Question 26

It is applied to samples taken from beds that were originally horizontal and have been tilted by later tectonic effects.

Answer 26

Fold Test

Question 27

If the magnetization was acquired by the rock after it was folded, it will have a uniform direction at all points of the fold

Answer 27

Post Folding Magnetization

Question 28

If the paleomagnetic direction in the rock is stable, it will experience the same rigid-body rotation as the tilted strata; its direction will vary around the fold

Answer 28

prefolding magnetization

Question 29

If magnetization is acquired during the tectonic event; this case the direction of magnetization changes around the fold but by a smaller amount than the folding

Answer 29

(synfolding magnetization)

Question 30

T or F: Suppose we are investigating a limestone formation and that we discover a conglomerate containing cobbles of the limestone. their paleomagnetic directions, if stable, should be evenly distributed.

Answer 30

False

Question 31

During intrusion of a dike or sill the adjacent layers of the host rock are baked by contact with the hot lava and acquire a TRM when they cool.

Answer 31

Baked Contact Test

Question 32

If samples taken from the lava and contact zone of the host rock have the __________ magnetization direction .

Answer 32

Same

Question 33

This test can be applied when the paleomagnetic samples represent a large enough time interval (>10 ka) to have recorded normal and reversed polarities of the magnetic field

Answer 33

Reversals Test

Question 34

T or F: presence of an unremoved secondary component will give resultant normal and reversed directions that are no longer antiparallel.

Answer 34

True