Space Physics II Quiz

What is the equation of motion for a particle of charge q due to electric field (E) and magnetic field (B)?

• dP/dt = q(E + V × B)

• m dv/dt = q(E + V × B)

• Both of the above

• None of the above

What happens to the particle kinetic energy and the magnitude of its velocity when IFE=0?

• They are both constant

• They increase

• They decrease

• They become zero

What is the continuity equation for charged particles?

• ∂n_i,e/∂t + ∇·(n_i,e v_i,e) = q - l

• ∂n_i,e/∂t - ∇·(n_i,e v_i,e) = q + l

• n_i,e = q - l

• None of the above

What is the definition of Pedersen conductivity?

• Conductivity for the direction vertical to the magnetic field and parallel to the electric field

• Conductivity for the direction parallel to the magnetic field

• Conductivity for the direction vertical to both the magnetic and electric fields

• None of the above

What happens to the conductivity parallel to the magnetic field with increasing altitude?

• It decreases

• It increases

• It remains constant

• It becomes zero

What is the relationship between collision frequency and gyrofrequency for charged particles?

• If ν > ω_g, particles move in the direction of the electric field

• If ν < ω_g, particles move in the direction of the electric field

• Both statements are true

• None of the above

What is the angular gyro frequency of the ion?

• ω_i = eB/m_i

• ω_i = m_i/eB

• ω_i = e/m_iB

• None of the above

What is the effect of altitude on Hall conductivity?

• It increases sharply above 130 km

• It decreases sharply above 130 km

• It remains constant

• It becomes zero

What is the relationship between the drift of electrons and ions in the same direction?

• It constitutes an electric current

• It does not constitute an electric current

• It increases conductivity

• None of the above

What is the ionospheric dynamo?

• A mechanism that generates power.

• A mechanism that converts kinetic energy of thermospheric fluid into electrostatic energy.

• A process that creates electric fields through plasma collisions.