If E field points up, which way does B field point?

[Usaf Moji]

Ok, dumb question, I know. But it's been bugging me, and I can't find a straight answer anywhere, so here it goes:

In a classical electromagnetic wave, where the electric field points upward, will the magentic field point AT me or AWAY from me?

I've seen textbooks depict them both ways - can it really be both ways, or is it just sloppyness on the part of the drafters?

All responses appreciated.

 

[berkeman]

What is the vector definition of the Poynting vector?

 

[Usaf Moji]

What is the vector definition of the Poynting vector?

Ah, I forgot to mention that I'm imagining the electromagnetic wave propagating to our right-hand side. So, I go E cross B with S pointing in the direction of propagation...to answer my own question, the magnetic field must point AT me...and, yes, the opposite depiction in some textbooks must be a drafting error.

Thank you, Berkeman