Anisotropic Atomic Hydrogen Distribution in Interplanetary Space

Global structure of the heliosphere and interaction with the local interstellar medium: three decades of growing knowledge

“…A few years later, however, Blum and Fahr (1970) could demonstrate that the features of the great circle Lyman-a scans carried out by VELA-7 (Chambers et al, 1970) could perfectly be explained as due to solar Lyman-a radiation resonantly scattered by an interplanetary hydrogen distribution described by just those theoretical modellings as sketched above. This is shown in Fig.…”

Hydrogen in the upper atmosphere

“…Extraterrestrial Lyman a was measured at 110,000 km on the Vela 4 spacecraft in 1967 [Chambers et al, 1970] and on Mariners 5 and 6 [Barth, 1970]. Lyman a: scans over much of the celestial sphere were made from Ogo 5 at more than 80,000 km by Thomas and Krassa [ 1971 ].…”