Sunward-propagating Alfvénic Fluctuations Observed in the Heliosphere

摘要

In the second paragraph of the Introduction on the first page, “However, only a few clear events of sunward-propagating Alfvénic fluctuations (SAFs) are reported in the literature. Roberts et al. (1987b) and Marsch (1991) found that discrete SAFs are rare in the pristine solar wind at 1 au.” should be revised as “However, only a few clear events of discrete sunward-propagating Alfvénic fluctuations (SAFs) are specially reported in the pristine solar wind in the literature (Marsch 1991). Roberts et al. (1987a, 1987b) calculated the normalized cross-helicity (σ_c) on 3 hr and larger scales for Helios and Voyager data from 0.3 to 20 au. Some situations with σ_c < ?0.85 shown by them may indicate the possible SAFs.”