The diffuse streaks of white in this VIS image are clouds. These are high altitude winter clouds over Melas Chasma. Streamers of clouds like this are moving very quickly in high altitude winds. Orbit Number: 88213 Latitude: -11.5665 Longitude: 290.207 Instrument: VIS Captured: 2021-11-02 18:14 https://photojournal.jpl.nasa.gov/catalog/PIA25195