How does aurora occurs?why it is only seen in the polar region?
Asked by vasturushi | 9th Jul, 2017, 01:25: PM
-The Earth has a magnetic field similar to a bar magnet, from the geographic South Pole to the geographic North Pole.
-Charged particles stream from the Sun and arrive in the Earth's vicinity.
-These charged particles undergo collisions in the Earth's vicinity which slows them down and they subsequently get trapped in spiral paths around the planet's magnetic field lines.
-The Earth's field lines become denser as they approach a pole.
-As the lines become denser the charged particles' path eventually turns back on itself.
-A particle spiralling along the field lines from the South Pole to the North Pole turns around at the North Pole spiralling back and heading southward.
-This effect is called magnetic mirrors.
-The aurora borealis and aurora austrealis is the consequence of the above effect.
-This occurs when the charged particles enter the atmosphere and excite the atoms in the air creating the visible colours.
-It is visible near the poles where the magnetic field lines dip toward the Earth's surface.
Answered by Abhijeet Mishra | 9th Jul, 2017, 09:26: PM
- pls explain
- What do you mean by magnetic Lorentz force?
- When will be the force experienced by moving charge in a magnetic field maximum and minimum?
- What is the work done by a magnetic field on a moving charge?
- In the expression, F= qvBsinθ which pair of vectors among , and is always perpendicular to each other.
- Deduce an expression for the force experienced by the moving charged particle in a uniform magnetic field?
- State the rule, which governs the direction of the magnetic Lorentz force.
- Under which conditions there is no force experienced by the charge particle in a uniform magnetic field?
- Discuss the motion of a charged particle in uniform magnetic field?
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Verify mobile number
Enter the OTP sent to your number