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MAXI J181-195 is a newly discovered accreting millisecond X-ray pulsar thatwent outburst in June 2022. Through timing analysis with NICER and NuSTARobservations, we find a transient modulation at ~2.5 Hz during the decay periodof MAXI J1816-195. The modulation is strongly correlated with a spectralhardening, and its fractional rms amplitude increases with energy. Theseresults suggest that the modulation is likely to be produced in an unstablecorona. In addition, the presence of the modulation during thermonuclear burstsindicates that it may originate from a disk-corona where the optical depth islikely the main factor affecting the modulation, rather than temperature.Moreover, we find significant reflection features in the spectra observedsimultaneously by NICER and NuSTAR, including a relativistically broadened Fe-Kline around 6-7 keV, and a Compton hump in the 10-30 keV energy band. Theradius of the inner disc is constrained to be Rin = (1.04-1.23) RISCO based onreflection modeling of the broadband spectra. Assuming that the inner disc istruncated at the magnetosphere radius, we estimate that the magnetic fieldstrength is < 4.67 * 10e8 G.

Detection of a strong ~2.5 Hz modulation in the Newly Discovered Millisecond Pulsar MAXI J1816-195