AGF-301/801: Reconnection 4

What are the two terms in the induction equation?

• Convective and diffusive

• Diffusive and magnetic

• Magnetic and plasma

• Convective and conductive

What is the magnetic Reynolds number?

• Ratio of convective to diffusive terms in the induction equation

• Ratio of thermal to magnetic pressure

• Difference in magnetic field on either side of a current sheet

• Distance from the Earth to the dayside magnetopause

When does "frozen in" apply?

• When magnetic Reynolds number is small (<< 1)

• When magnetic Reynolds number is large (>> 1)

• When plasma beta is small (<< 1)

• When plasma beta is large (>> 1)

What is the plasma "beta"?

• Ratio of thermal to magnetic pressures

• Ratio of convective to diffusive terms in the induction equation

• Density of magnetic field lines

• A plasma which is still in testing

What is the typical plasma beta in the solar wind?

• >> 1

• about 1

• << 1

• 0

What does it mean if the plasma beta is much less than 1?

• Magnetic field constrains the plasma

• Plasma carries the magnetic field

• Zombie apocalypse is about to start

• "Frozen in" is not a valid approximation