A tundra orbit is a special type of orbit meant to provide long periods of coverage to a single region at upper latitudes. Conceptually, it is somewhere between a Molniya orbit and a geosynchronous orbit.
Here is how to easily insert a new satellite with a tundra orbit using the satellite Orbit Wizard:
1) Open the "Insert STK Objects" window. Select "Satellite" as the object and "Orbit Wizard" as the method.
2) In the Orbit Wizard window (shown below), change Type to "Orbit Designer." Then change the following orbital elements:
Semimajor Axis:
42164 km, for a one day period
Eccentricity:
~0.2 to ~0.3, to achieve a longer dwell time in a hemisphere
Inclination:
63.4 deg, to keep the motion of Argument of Perigee due to the
Earth's J2 effect nearly constant
Argument of Perigee:
270 or 90 deg, for the northern hemisphere or southern hemisphere, respectively
RAAN: specify your own value; this moves the orbit "left" or "right" on the 2D projection
True Anomaly: specify your own value; changes the satellite location within the orbit at the start time
