Fig. 4

Time series of the sub-spacecraft points on Phobos and Mars at hourly intervals in the case of QSO-H. (a) Time series of Phobos local time of the sub-spacecraft (sub-SC) point on Phobos for one month. The day and night-sides of Phobos are indicated by small dots and crosses, respectively. (b) Time series of Mars local time of the sub-SC point on Mars for the last 5 days of the month. The day and night-sides of Mars are indicated by crosses and small dots, respectively. (c) Time series of longitude of the sub-SC points on Mars for the last 5 days of the month. Sub-SC points on Mars are indicated by crosses when the spacecraft is on the dayside of Mars and the nightside of Phobos