And of course you´ve considered this before replying, right?
The Solar EM heliosphere -
Heliosphere - Wikipedia
The
heliosphere is the vast, bubble-like
region of space that surrounds and is created by the
Sun. In plasma physics terms, it is the cavity formed by the Sun in the surrounding
interstellar medium. The "bubble" of the heliosphere is continuously "inflated" by
plasma originating from the Sun, known as the
solar wind. Outside the heliosphere, this solar plasma gives way to the interstellar plasma permeating the
Milky Way.
Radiation levels inside and outside the heliosphere differ; in particular, the galactic
cosmic rays are less abundant inside the heliosphere, so that the planets inside (including
Earth) are partly shielded from their impact. The word "heliosphere" is said to have been coined by
Alexander J. Dessler, who is credited with first use of the word in scientific literature in 1967.
[1] The scientific study of the heliosphere is
heliophysics, which includes
space weather and
space climate.
Flowing unimpeded through the
Solar System for billions of kilometres, the solar wind extends far beyond even the
region of Pluto, until it encounters the
termination shock, where its motion slows abruptly due to the outside
pressure of the interstellar medium. Beyond the shock lies the
heliosheath, a broad transitional region between the inner heliosphere and the external environment. The outermost edge of the heliosphere is called the
heliopause. The overall shape of the heliosphere resembles that of a
comet – being approximately spherical on one side, with a long trailing tail opposite, known as the heliotail.