This visualization starts from near Earth and the Earth orbiting satellite fleet out to the Moon, then past the Sun-Earth Lagrange point 1 to out beyond the heliopause. This is the long-play version.
There have been few changes since the 2015 Earth-Orbiting Heliophysics Fleet. As of summer 2017, here's a tour of the NASA Heliophysics fleet from the near-Earth satellites out to the Voyagers beyond the heliopause.
The satellite orbits are color coded for their observing program:
Magenta: TIM (Thermosphere, Ionosphere, Mesosphere) observations
Yellow: solar observations and imagery
Cyan: Geospace and magnetosphere
Violet: Heliospheric observations
Hinode: Observes the Sun in multiple wavelengths up to x-rays. SVS page
IBEX: The Interstellar Boundary Explorer measures the flux of neutral atoms from the heliopause. SVS page
Lunar Orbiting Fleet:
ARTEMIS: Two of the THEMIS satellites were moved into lunar orbit to study the interaction of the Earth's magnetosphere with the Moon. SVS page
Sun-Earth Lagrange Point One Fleet:
The L1 point is a Lagrange Point between the Sun and the Earth. Spacecraft can orbit this location for continuous coverage of the Sun.
SOHO: Studies the Sun with cameras and a multitude of other instruments. SVS page
ACE: Measures the composition and characteristics of the solar wind. SVS page
Wind: Measures particle flows and fields in the solar wind. SVS page
Solar Orbiting Fleet:
STEREO-A & STEREO-B: The two STEREO spaceraft orbit the Sun in roughly the same orbit as Earth. There have been some communications problems with STEREO-B since 2014. SVS page
Voyager 1 & Voyager 2: The two Voyager spaceraft orbit originally performed flybys of the outer planets of the solar system but continued to operate. They are now the most distant monitors of the plasma in the space between the stars. SVS page