It isn't necessarily affected by seasons, because it is caused by unpredictable solar winds... but in the north, they are more likely in the summer, because the northern hemisphere is tilted towards the sun, but can occur year round.
When they are visible, they are best seen at night.
The Aurora Borealis (Northern Lights) and the Aurora Australis (Southern Lights).
The Southern (or Northern) Lights are caused by particles ejected from the sun by solar flares, getting trapped in the ionosphere and radiating. They happen all the time, but the conditions have to be right for them to be visible.
No. It is down to activity on the Sun, which is unpredictable. When there is unusual activity on the surface of the sun that is seen by astronomers, they can predict that the Northern Lights will be visible in a few days after that. That can happen at any time. There is no pattern in terms of when it can happen. Most of the time the required activity is not happening on the sun, so the Northern Lights don't appear at all.
It is uncommon for the Northern Lights to be visible at lower latitudes. But sometimes there are solar storms strong enough to produce the Northern Lights in places like Seattle Washington.
The northern lights don't happen on a fixed schedule; we generally can't predict when they are likely to occur. However, the great-circle route from Denver to London does cross some pretty high latitudes, so there's a good chance that they will be visible.
they are mostly visible in the Northern Hemisphere, especially in Northern Canada, Norway and Russia
yes
Your friend probably has auroraphobia. This is the official phobia of the Northern Lights.
It is visible in the summer, in the Northern Hemisphere.
The Northern lights were visible for a short time in Maryland in October of 2001 due to a solar flare. The Northern lights are most visible the further north one goes. Video is available for a vantage view.
Fredericksberg
No, appears in the North Pole.
Yes they are visible in Alaska.
From a partial to a complete width of the visible northern horizon.
There are no northern lights in Antarctica. However, the southern lights -- Aurora Australis -- are visible from the continent.
Yes, they are visible from basically anywhere in Alaska where they are not washed out by City Lights. They are often visible from Northern States in the Continental US. During unusually high Solar activity they are visible even further South.
The Northern Lights occur in space, and are visible from many countries north of the Equator: the farther north, the higher your chances of seeing them.