- #1

Astrum

- 269

- 5

This is "The effect of a Radio Wave on an Ionospheric Electron"

The integration is weird, I don't follow what is being done.

[tex]

**a**=\frac{-e

**E**}{m}[/tex] - reworking of F=ma

[tex]\frac{-e

**E**}{m}sin(\omega t[/tex]

only interested in the x axis.

[tex]\int\frac{dv}{dt}=\int^{t}_{0}a_{0}sin(\omega t) dt[/tex]

This becomes: [tex]v(t)=v_{0}-\frac{a_{0}}{\omega}cos(\omega t-1)[/tex]

- I don't get where this came from, I understand the indefinite integration, but not where the "ωt-1" came from.

And the last step:

[tex]\int\frac{dx}{dt}=\int^{t}_{0}[v_{0}-\frac{a_{0}}{\omega}cost(\omega t-1)]dt[/tex]

= [tex]x_{0} + (v_{0}+\frac{a_{0}}{\omega})t-\frac{a_{0}}{\omega^{2}}sin(\omega t)[/tex]

Not sure where the final answer comes from. Could't you just integrate it twice, then tack on the definite integral?