Solar probes Helios 1 and 2

Details Solar probes Helios 1 and 2 Solar probes Helios 1 and 2

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981dfvlr..33...33p&link_type=abstract

DFVLR-Nachrichten, vol. 33, June 1981, p. 33. In German.

Physics

Helios 1, Helios 2, Interplanetary Magnetic Fields, Solar Magnetic Field, Solar Probes, Solar Radiation, Cosmic Rays, Life (Durability), Solar Constant

Scientific paper

The closest distance between Helios 2 and the Sun was 0.29 AU, while the closest approach of Helios 1 to the Sun was 0.31 AU. The solar probes were exposed to a maximum solar radiation of 11.87 and 10.44 solar constants, respectively. The operational life of Helios 2 was almost five years, although the original life expectance had been only 1 1/2 years. The Helios 1 and Helios 2 missions have provided valuable information regarding the space between Earth and Sun. It is now known which structures predominate in this space. Expectations regarding a spiral structure of the solar-interplanetary magnetic field could be confirmed, while a hypothesis regarding a large spatial gradient of the galactic cosmic radiation had to be rejected.

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