Cyclone (Su): At 8th level, you can create a vortex of turbulent wind around yourself as a standard action. This vortex has a radius of up to 10 feet and a maximum height of 10 feet per wizard level you possess. Any ranged attack passing through this vortex automatically misses. Any flying creature moving through the vortex must make a Fly skill check or immediately fall from the sky, taking falling damage (the creature cannot make a Fly check to reduce or negate this damage). Creatures on the ground cannot pass through the vortex without first making a Strength check. The DC of this check is equal to 10 + your caster level. The vortex is faintly visible and can be spotted with a DC 15 Perception skill check. You can use this ability for a number of rounds per day equal to your wizard level. These rounds do not need to be consecutive.
#1) When the cyclone is activated and the player then flies around or moves, does the vortex of turbulent air move with them ?
I don't know. I assume it stays where you put it.
#2) The second sentence reads "This vortex has a radius of up to 10 feet and a maximum height of 10 feet per wizard level you possess."
Does this mean that both the the radius and the height increase by 10 feet per wizard level you possess?
I don't think so.
The radius is up to 10 feet.
The maximum height is 10 feet per wizard level.
#3) Is the wind strength of this Cyclone equivalent to a Tornado wind effect ( table 13-10 on page 439 of the core rulebook) ?
If not, please advise as to what wind strength this cyclone would have when analysed on table 13-10 ?
I don't believe Table: Wind Effects should have any additional effects not described in the cyclone ability. It does what it says and nothing more.
would magic rays and magic missiles miss you as well?
Ray: "Some effects are rays. You aim a ray as if using a ranged weapon, though typically you make a ranged touch attack rather than a normal ranged attack. As with a ranged weapon, you can fire into the dark or at an invisible creature and hope you hit something. You don't have to see the creature you're trying to hit, as you do with a targeted spell. Intervening creatures and obstacles, however, can block your line of sight or provide cover for the creature at which you're aiming."
Magic Missile: "The missile strikes unerringly, even if the target is in melee combat, so long as it has less than total cover or total concealment."