Fig. B.1

image

Proton tangential speed as measured in the spacecraft frame (vx) during E03 and E04 with SPC (grey “+”) and SPAN (teal “x”). The tangential speed of PSP with respect to the flow (which must be subtracted from vx to recover vt) is shown with a black line. The difference between the black line and the measured vx is the tangential speed vt, as shown in the example.

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