Mars & Atmospheric Dispersion

I've been imaging Mars with both C8 and C11 SCTs and a Philips TouCam Pro webcam. From my location Mars is never more that 32 degrees above the southern horizon. Consequntly, my images show significant atmospheric dispersion effects (red halo near the top and blue at the bottom). The images are very nice otherwise with good surface detail and color. Has anybody encountered this and thought of a fix in the processing of the images? Thanks.