O. Moullard et al., WHISTLER WAVES OBSERVED DURING AN IN-SITU SOLAR-TYPE-III RADIO-BURST, Astronomy and astrophysics (Berlin), 335(2), 1998, pp. 703-708
On Dec. 24, 1996, the WIND spacecraft encountered a solar type III sou
rce region at 1 AU, as indicated by a characteristic radio signature d
own to less than the second harmonic of the local electron plasma freq
uency, the enhancement of the electron flux at high energies and the p
resence of electrostatic noise at the local plasma frequency. During t
his interval, electromagnetic wave activity was recorded below the ele
ctron cyclotron frequency, by the Time Domain Sampler of the WAVES ins
trument. Analysis suggests that the observed waves are whistler waves,
propagating, approximately parallel or antiparallel to the interplane
tary magnetic field, in the plasma frame.