Birkeland Currents and Earth's Magnetosphere Quiz
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Questions and Answers

What drives the Birkeland currents in the Earth's magnetosphere?

  • Solar wind and interplanetary magnetic field (correct)
  • Atmospheric pressure imbalances
  • Earth's rotation
  • Oceanic currents

What creates the Auroras Borealis and Australis in the upper atmosphere?

  • Magnetospheric electrons accelerated by upward current sheets (correct)
  • Lightning discharges
  • Volcanic eruptions
  • Cosmic rays from distant galaxies

Where do the Birkeland currents close in the high latitude ionosphere?

  • At the equator
  • In the mesosphere
  • Through the region of the auroral electrojet (correct)
  • In the Earth's core

What causes the strength of the Birkeland currents to change in the magnetosphere?

<p>Activity in the magnetosphere such as substorms (D)</p> Signup and view all the answers

What are Birkeland currents also known as?

<p>Field-aligned currents (B)</p> Signup and view all the answers

What drives the Birkeland currents in the Earth's magnetosphere?

<p>Solar wind and interplanetary magnetic field (B)</p> Signup and view all the answers

Where do the Birkeland currents close in the high latitude ionosphere?

<p>Auroral electrojet region (B)</p> Signup and view all the answers

What accelerates magnetospheric electrons in the upward current sheets?

<p>Small scale variations (A)</p> Signup and view all the answers

What creates the Auroras Borealis and Australis in the upper atmosphere?

<p>Magnetospheric electrons reaching the upper atmosphere (A)</p> Signup and view all the answers

What are the Birkeland currents also known as?

<p>Field-aligned currents (D)</p> Signup and view all the answers

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