Ground?Based Magnetometer Response to Impacting Magnetosheath Jets

Localized dynamic pressure pulses in the magnetosheath, or jets, have been a popular topic for discussion recent decades. Studies show that they can propagate through magnetosheath and impact magnetopause, possibly showing up as geoeffective elements at ground level. However, questions still remain on how be. Previous studies limited to case during few days with only handful of events. In this study we found 65 cases impacting jets using observations from Multiscale Magnetospheric mission 2015–2017. We examine their geoeffectiveness ground-based magnetometers (GMAGs). From our statistics find GMAGs observe responses fluctuations geomagnetic field amplitudes 34 nT, frequencies 1.9 mHz, damping times 370 s. Further, parallel length maximum jet dictate amplitude observed GMAG response. Longer higher inducing larger horizontal components. The median time required signal be detected by is 190 also if harmful human infrastructure cannot exclude such events could exist.