Accelerating charge emits em waves or pulse

[God Plays Dice]

Does an accelerating charge, such as one turning a corner emit an em wave or just a pulse? Classical logic dictates it should just be a pulse as there is no oscillation. But which is it?

 

[God Plays Dice]

Let me be more specific. An electron in a magnetic field, not synchotron radiation as this is a spiralling electron

 

[Dale]

Here is the Lienard Wiechert potentials which describe an accelerating charge along with the Larmor radiation from such a charge

http://fermi.la.asu.edu/PHY531/larmor/larmor.html

 

[God Plays Dice]

Sry but I don't understand all those hyroglifics. Just intuitively is a free electron similar to an antenna, where I assume a half wavelength pulse can be created or is it a different case

 

[Dale]

Sry but I don't understand all those hyroglifics

Then in the future please mark your threads as "B" instead of "I". The math in that link is standard vector calculus from undergraduate level physics.

I have updated this thread for you.

 

[Dale]

Here is a link at a more basic level, with no calculus

http://hyperphysics.phy-astr.gsu.edu/hbase/particles/synchrotron.html

Synchrotron radiation is the correct term, even if the path bend is short and not very spiral-like.

 

[blue_leaf77]

Classical logic dictates it should just be a pulse as there is no oscillation. But which is it?

Taking the case of wiggler radiation as an analogy to the kind of motion you are considering, a Wiki link (https://en.wikipedia.org/wiki/Wiggler_(synchrotron)) says "A wiggler has a broader spectrum of radiation than an undulator". This suggests that the radiation is indeed confined in time, or is commonly referred as a pulse. By the way, light pulse does not necessarily implies that the pulse length is short enough such that one cycle of the carrier frequency cannot be covered. A pulse is usually described as an oscillation under a localized envelope.