Question
What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions?
Answer Options
- A) Southward
- B) Northward
- C) Eastward
- D) Westward
Correct Answer: A
Explanation
The B_z (North-South component of the Interplanetary Magnetic Field) value is the single most important parameter for predicting a geomagnetic storm and associated radio propagation disturbances. The interaction between the IMF and the Earth’s magnetosphere is based on magnetic field opposition.
An orientation of B_z that increases the likelihood of disturbed conditions is Southward. When the IMF’s North-South component points South, it is anti-parallel (opposite) to the Earth’s Northward magnetic field. This opposition allows for ‘reconnection’ of the magnetic field lines, opening a path for charged solar particles to stream directly into the Earth’s polar regions, causing geomagnetic storms and widespread radio absorption.
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