Macro Magnetic Holes Caused by Ripples in Heliospheric Current Sheet from Coordinated Imaging and Parker Solar Probe Observations

Macro magnetic holes (MMHs), which are significant field decreases in the solar wind lasting tens of minutes, were found during first four orbits Parker Solar Probe (PSP). We performed a detailed analysis 2020 January 30 event and possible cause MMH using coordinated remote sensing observations from STEREO A PSP situ measurements. The results indicate that an represents brief encounter with rippled heliospheric current sheet (HCS). Out data PSP, we identified 17 MMHs carried out statistical analysis. Basic characteristics include (1) usually last minutes; (2) strength inside events is much lower than ambient wind; (3) enhanced plasma density, radial velocity, β MMHs; (4) has same polarity before after MMH. Based on potential field-source surface magnetohydrodynamics models, for each roughly estimate size limit vertical (i.e., separation distance between HCS), 2 R⊙ 10 average, respectively. These suggest frequent phenomenon may shed light dynamics HCS origins evolutions structures heliosphere.