Free Access

Table 1

Hanle sensitivity (in G) of the first lines of the hydrogen Lyman series.

Line Wavelength Bt
 Å G

Lyα 1216 53.2
Lyβ 1026 16
Lyγ 992 7

Notes. This sensitivity is defined as the field strength Bt (typical field) for which ωτ = 1, where ω is the Larmor pulsation and τ is the upper level lifetime. All the transitions leaving the upper level are taken into account in the lifetime. From Sahal-Bréchot (1981, Table I).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.