Question: What relative of Charles Hirshberg made important contributions to the study of solar wind particles and fields, as well as sun-Earth relations; and magnetospheric physics?

The term heliophysics means "physics of the Sun" (the prefix "helio", from Attic Greek "hḗlios", means Sun), and appears to have been used only in that sense until quite recently.  In the early times, heliophysics was concerned principally with the superficial layers of the star, and was synonymous with what is now more commonly called "solar physics".  Usage was extended explicitly in 1981 to its literal meaning, denoting the physics of the entire Sun: from center to corona, and has been used in that sense since.  As such it was a direct translation from the French "héliophysique", which had been introduced to provide a distinction from "physique solaire" (solar physics).  It thus became a subdiscipline of heliology.  Early in the 21st century the meaning of the term was extended by Dr George Siscoe of Boston University to include the physics of the heliosphere (the space around the Sun beyond the corona, in principle out to the shock where the solar wind encounters the interstellar medium, but excluding the planets and other condensed bodies), although Siscoe's view of the discipline appears not to contain most of the true realm of endeavour.  The term was adopted in Siscoe's restricted sense by the NASA Science Mission Directorate to denote the study of the heliosphere and the objects that interact with it—most notably planetary atmospheres and magnetospheres, the solar corona, and the interstellar medium.  Heliophysics combines several other disciplines, including solar physics, and stellar physics in general, and also several branches of nuclear physics, plasma physics, space physics and magnetospheric physics.  Solar wind interaction with magnetized planets, Solar wind propagation, Solar activity effects on planetary magnetospheres.  Solar magnetic field configuration from the Sun to the Heliopause.  The recent extension of heliophysics is closely tied to the study of space weather and the phenomena that affect it, and consequently to climatology.  To quote Siscoe from a recent conference presentation: <SEP>  He primarily writes for large-circulation magazines.  His articles and columns have appeared in "Time", "Sports Illustrated", "Life", the "Los Angeles Times", the "Washington Post", "Men's Health" and other publications. Charles "Chuck" Hirshberg is an American journalist and sportswriter.  As of 2002, he was an editor of "Popular Science".  His mother is the astrophysicist Joan Feynman and his uncle was Nobel Prize-winning physicist Richard Feynman. <SEP>  She has made important contributions to the study of solar wind particles and fields; sun-Earth relations; and magnetospheric physics. Joan Feynman (born March 31, 1927) is an American astrophysicist.  In particular, Feynman is known for developing an understanding of the origin of auroras.  She is also known for creating a model that predicts the number of high-energy particles likely to hit a spacecraft over its lifetime, and for uncovering a method for predicting sunspot cycles.  Feynman is the younger sister of physicist Richard Feynman. <SEP> Explorer 14 is a spin-stabilized, solar-cell-powered spacecraft instrumented to measure cosmic-ray particles, trapped particles, solar wind protons, and magnetospheric and interplanetary magnetic fields.  A 16-channel PFM/PM time-division multiplexed telemeter was used.  The time required to sample the 16 channels (one frame period) was 0.323 s. Half of the channels were used to convey eight-level digital information, and the others were used for analog information.  During ground processing of the telemetered data, the analog information was digitized with an accuracy of 1/100 of full scale.  One analog channel was subcommutated in a 16-frame-long pattern and was used to telemeter spacecraft temperatures, power system voltages, currents, etc.  A digital solar aspect sensor measured the spin period and phase, digitized to 0.041 s, and the angle between the spin axis and sun direction to about 3-degree intervals.