Why do you not see the Aurora Borealis all the time?

Answer 1

Because aurora borealis is created due to solar wind from the Sun. That will predominantly come if the Sun has a solar eruption or solar flare (same thing). The particles take about 2 or 3 days to reach Earth and when some of them are accelerated by the magnetic field near the poles they interact with the atoms of our upper atmosphere and we see the lights.

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The aurora borealis (the "northern lights') is caused by the interaction of high energy charged particles from the Sun interacting with the Earth's magnetic field in the ionosphere. But it is difficult to predict exactly where or when the aurora will be visible, indicating that there are probably other factors of which we remain ignorant.

Auroras are not permanently visible because the ionosphere itself is not perfectly uniform, and the flux of charged particles from the Sun is quite variable.