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We study the 2018 outburst of Aql X-1 via the monitor of all sky X-ray image(MAXI) data. We show that the outburst starting in February 2018 is a member ofshort-low class in the frame of outburst duration and the peak count ratealthough the outburst morphology is slightly different from the otherfast-rise-exponential-decay (FRED) type outbursts with a milder rising stage.We study the partial accretion in the weak propeller stage of Aql X-1 via theMAXI data of the 2018 outburst. We report on the spectral analysis of 3observations of Aquila X-1 obtained by Insight - hard X-ray modulationtelescope (Insight-HXMT) during the late decay stage of the 2018 outburst. Wediscuss that the data taken by Insight-HXMT is just after the transition to theweak propeller stage. Our analysis shows the necessity of a comptonizationcomponent to take into account the existence of an electron cloud resultingphotons partly up-scattered.

Diagnostic of the spectral properties of Aquila X-1 by Insight-HXMT snapshots during the early propeller phase