heliopausen.
/ˈhiːlɪəpɔːz/, U.S. /ˈhiliəˌpɔz/, /ˈhiliəˌpɑz/, /ˈhiljəˌpɔz/, /ˈhiljəˌpɑz/ Astronomy.
The outer edge of the heliosphere, beyond which the solar wind is undetectable.
ΚΠ
1970 Proc. 11th Internat. Conf. Cosmic Rays 1969 in Acta Physica Acad. Sci. Hungaricae 29 Suppl. II. 282 The large-scale nature of the solar magnetic field may be transmitted by the magnetic field frozen in the solar wind plasma to the heliopause.
1991 SunWorld Dec. 46/2 The spacecraft are collecting field and particle data as they try to locate the heliopause.
2014 Red Bull. Jan. 24 (caption) Aug. 25, 2012... Voyager 1 crosses the heliopause, the second solar system boundary, into interstellar space.
This is a new entry (OED Third Edition, March 2017; most recently modified version published online March 2022).
<
n.1970- time capsule
- time card
- time catch
- time change
- time chart
- time charter
- time check
- time clause
- time clock
- time code
- time constant
- time constraint
- time course
- time curve
- time cycle
- time delay
- time deposit
- time derivative
- time detector
- time determination
- time difference
- time differential
- time dilatation
- time dilation
- time dimension