heliospheren.
/ˈhiːlɪəsfɪə/, U.S. /ˈhiliəˌsfɪ(ə)r/, /ˈhiljəˌsfɪ(ə)r/ Astronomy.
The region of space, encompassing the solar system and extending to the heliopause, in which the solar wind has a measurable influence.
ΚΠ
1967 H. E. Newell NASA's Space Sci. & Applic. Program 486 That is, what is the extent of the heliosphere where, by analogy with the term magnetosphere, I take the term to mean the region of space which is under the dominating influence of the Sun.
1992 Astronomy June 26/2 The spacecraft is now probing the outer limits of the Sun's extended atmosphere, the heliosphere.
2007 H. Svensmark & N. Calder Chilling Stars viii. 211 Encounters with small, dense gas clouds..could have reduced the heliosphere to a quarter of its present diameter and doubled the intensity of cosmic rays coming from the Galaxy.
Derivatives
helioˈspheric adj. of or relating to the heliosphere.
ΚΠ
1970 Proc. 11th Internat. Conf. Cosmic Rays 1969 in Acta Physica Acad. Sci. Hungaricae 29 Suppl. II. 280 (caption) Graph of the galactic equator... The poles of the sun, the heliospheric equator and 30° north heliographic latitude are indicated.
2003 UFO Mag. Sept. 13/1 Mike had hired a theatre at the Centre to present images of alleged anomalous objects taken by the European Space Agency's Solar and Heliospheric Observatory (SOHO).
This is a new entry (OED Third Edition, June 2017; most recently modified version published online March 2022).
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n.1967