Holey Moley Subproton Scale Magnetic Holes in Magnetospheric

Holey Moley! Sub-proton Scale Magnetic Holes in Magnetospheric Plasmas MMS SWT 10/06/2030 Katy Goodrich

What are Magnetic Holes? • • • Depressions in |B| No large changes in B direction Can decrease up to ~ 1/10 the median |B| field value Size can vary depending on location and plasma conditions Will focus on magnetic holes ≲ proton gyroradius Example: Winterhalter et al. , 1995

Magnetic Holes in the Magnetosphere Magnetosheath Plasmasheet Δ|B|/|B| > 50% Bipolar Currents Density Increase Density constant �heating Electron Trapping Waves between MHs Langmuir Waves

Even More Magnetic Holes • Even newer observations suggest MHs at • Magnetopause • Bow shock • Inconsistent heating • Inconsistent trapping • What does this mean? !

Sub-proton Scale Magnetic Holes at Venus? ~50 ms ~20 km *first ever direct measurements of E field at Venus btw

Sub-proton Scale Magnetic Holes at Venus? • Seven potential MH candidates during Venus flyby • All within the magnetosheath/magnetic pileup regions • No clear MHs found in the solar wind • PSP will encounter Venus six more times (3/7 so far) • Great opportunities to observe Venusian microphysics and compare to MMS