DSCOVR Turbulence and Plasma Wave Observations at L1, and Correlation of Solar Wind Parameters With Spacecraft Separation

The magnetometer onboard the NOAA DSCOVR spacecraft samples the interplanetary magnetic field at 50 samples/second, presenting unique opportunities to study turbulence and plasma waves in the solar wind up to the instruments 25 Hz Nyquist. In this study, we present example observations by DSCOVR of turbulence and Alfven waves during periods of solar flares, coronal mass ejections, and solar energetic particle (SEP)events. We present the turbulence structures, including spectral indices at different frequencies, and discuss how it relates to coherence waves observed during cascade and dissipation. We also present wave properties, including frequency range, wave power and polarization. In addition, by comparing DSCOVR to ACE and Wind results, we discuss the dependency of solar wind parameters on spacecraft separation and the implications for studying the evolution of cascading turbulence. Finally, we explain how users can access this distinctive DSCOVR full high-resolution magnetic field dataset through the NOAA-NCEI DSCOVR portal.