Figure 9. Highlight of the
airfall dust on the cal-targets and the rover deck on sol 318, as result
of the dust event that started on sol 314. The left image is an RGB shot
by the left eye of Mastcam-Z on sol 318 at 48 mm zoom (seq. ZCAM03014),
while the image on the right is the outcome of a decorrelation stretch
(DCS) performed on the left image. The DCS was obtained using the L2
(754 nm), L5 (528 nm) and L6 (442 nm) filters for the Red, Green and
Blue channels, respectively. Image-ID:
ZL0_0318_0695174407_428IOF_N0090000ZCAM03014_048085A02.
Large sand grains appeared frequently in the cal-target frames, with a
characteristic dark color. These grains were able to persist for several
sols on the deck around the cal-targets, since a strong drag force of
the wind or vibrations due to the rover’s drive are required to move
such massive and large grains. Figure 10 shows four examples of such
grains on the deck around the primary target imaged by Mastcam-Z on sols
23 and 302, with a zoom-in on one of those grains (Figure 10c).