Author Question: In what ways do the magnetic fields of both Uranus and Neptune defy the conventional Dynamo Theory ... (Read 43 times)

meagbuch · **on:** Jul 27, 2018

In what ways do the magnetic fields of both Uranus and Neptune defy the conventional Dynamo Theory for planetary magnetic fields?

What will be an ideal response?

Question 2

Early in the 20th century, our galaxy was estimated to be:

A) about 100,000 ly in diameter.
B) about 35,000 ly (10 kpc) in diameter.
C) about 10 million ly in diameter.
D) not much larger than our solar system.
E) about 2.5 million ly in diameter.

adf223 · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

The planet's rotation, as the word dynamo implies, is paramount in generating the magnetic field, so the field should align itself with the rotational axis; in other words, the N needle on a compass should really point north. For Saturn, it is fine, but at Earth and Jupiter, the field is off by about 10 degrees. However, for Uranus this magnetic tilt is 59 degrees, and even for Neptune it is 47 degrees off. Also, the core of the planet should contain the electrically conductive fluid that generates the field, but for both green giants, the fields do not pass anywhere close to this core.

Answer to Question 2

B