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Wave emissions at frequencies near electron gyrofrequency harmonics areobserved at small heliocentric distances below about 40 solar radii and areknown to occur in regions with quiescent magnetic fields. We show the closeconnection of these waves with the large-scale properties of the magneticfield. Near electron gyrofrequency harmonics emissions occur only when theambient magnetic field points to a narrow range of directions bounded by polarand azimuthal angular ranges in the RTN coordinate system of correspondingly$80^{\circ} \lesssim \theta_B \lesssim 100^{\circ}$ and $10^{\circ} \lesssim\phi_B \lesssim 30^{\circ}$. We show that the amplitudes of wave emissions arehighest when both angles are close to the center of their respective angularinterval favorable to wave emissions. The intensity of wave emissionscorrelates with the magnetic field angular changes at both large and small timescales. Wave emissions intervals correlate with intervals of decreases in theamplitudes of broadband magnetic fluctuations at low frequencies of 10Hz-100Hz.We discuss possible generation mechanisms of the waves.

astrophysical journal/the astrophysical journal

Parker Solar Probe observations of near-$f_{\rm ce}$ harmonics emissions  in the near-Sun solar wind and their dependence on the magnetic field  direction