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(a) The Swarm A (top) tracked GPS satellite number and (bottom) in situ electron density measurements along its orbits on 17–18 March 2015. There are seven periods when Swarm A tracked GPS satellite number less than four, and they are indicated by red asterisks and marked as periods PA to PG. The detailed variations of tracked GPS satellite number, ROTI, in situ electron density and temperature, as well as the small-scale FAC profiles of Swarm A for four periods at high latitudes when tracked GPS satellite less four (indicated by red color in the top frame) are observed.
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