Panorama from the Summit (3) - Sol 585

In this time of year when Mars is most likely to be covered by global dust storms, NASA's Spirit Rover has been experiencing relative calm.
In fact, the martian winds have been quite beneficial, clearing dust from the Rover's solar panels and increasing the solar energy available for driving to new places and conducting scientific experiments.
Another thing the martian wind has done is send hundreds of Dust Devils spinning across the surface of the Planet.
From Spirit's high perch approximately 90 mt (about 295 feet) above the surrounding plains, as shown in many images taken from the Summit of Husband Hill, many DD's have been clearly visible in the plains of Gusev Crater.
Planetary Scientist Ron Greeley of Arizona State University, describes the whirling vortices of wind and dust as "vacuum cleaners" that were first seen in images from the Viking Orbiter in 1985, though their existence was predicted as early as 1964.