This is obviously not the case in this example, which shows many regions where the ionosphere is tilted. A few examples are shown below. This first map is a map showing how geomagnetic latitude maps onto geographic coordinates. Using this map, you can determine what your geomagnetic latitude is. Notice how the magnetic equator deviates strongly from the geographic equator.
Geomagnetic coordinates are much more important than geographic coordinates in radio propagation.
Another interesting example is the map given below. The contours are labelled in km above the surface of the Earth. This type of map projection is extremely useful for instantly determining the great-circle bearings to distant regions of the world. The azimuth to Australia is much less sensitive. Transmissions using azimuths between about 250 and 290 degrees will reach Australia provided the signal does not deviate from the great-circle path.