 In winter, the depression produces an average of 700,000 tonnes of dust each day (Todd et al., 2007).Research published in the 25 March 2004 edition of "Geophysical Research Letters", which used images taken by the Moderate Resolution Imaging Spectroradiometer (MODIS), aboard NASA's Terra and Aqua satellites, indicated that storms move across the Bodélé Depression at about 47 km/h (29 mi/h)—two times faster than previously believed.The research also found that winds have to whip across the region at a minimum of 36 km/h (22 mi/h), to kick up a dust storm.