Citation: | Hsieh, S-Y. W., and Sibeck, D. G. (2024). Origins of perturbations in dayside equatorial ground magnetograms. Earth Planet. Phys., 8(1), 215–221. doi: 10.26464/epp2023087 |
To determine the cause(s) of perturbations seen in dayside equatorial ground magnetograms, we conducted a systematic survey of simultaneous ground-based and geosynchronous satellite-based observations during the 90-day period from December 1, 2020 to February 28, 2021. We examined Huancayo ground magnetometer observations from 14:00:00 to 20:00:00 UT each day, during which Huancayo passed through local noon. From those data we chose perturbation events selected on the basis of large (>20 nT) event amplitude and classified the selected events as responding primarily to solar wind pressure, or to variations in the north/south component of the interplanetary magnetic field (IMF