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
Near-Earth Fleet:
Hinode: Observes the Sun in multiple wavelengths up to x-rays. SVS page
RHESSI : Observes the Sun in x-rays and gamma-rays. SVS page
TIMED: Studies the upper layers (40-110 miles up) of Earth's atmosphere. SVS page
SORCE: Monitors solar intensity across a broad range of the electromagnetic spectrum.
AIM: Images and measures noctilucent clouds. SVS page
Van Allen Probes: Two probes moving along the same orbit designed to study the impact of space weather on Earth's radiation belts. SVS page
TWINS: Two Wide-Angle Imaging Neutral-Atom Spectrometers are two probes observing the Earth with neutral atom imagers.
IRIS: Interface Region Imaging Spectrograph is designed to take high-resolution spectra and images of the region between the solar photosphere and solar atmosphere. SVS page
Geosynchronous Fleet:
SDO: Solar Dynamics Observatory keeps the Sun under continuous observation at 16 megapixel resolution. SVS page
Geospace Fleet:
Geotail: Conducts measurements of electrons and ions in the Earth's magnetotail. SVS page
Magnetospheric Multi-scale (MMS): This is a group of four satellites which fly in formation to measure how particles and fields in the magnetosphere vary in space and time. 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
Interstellar Fleet:
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
Tom Bridgman (Global Science and Technology, Inc.): Lead Visualizer Laurence Schuler (ADNET Systems, Inc.): Technical Support Ian Jones (ADNET Systems, Inc.): Technical Support
Please give credit for this item to: NASA's Scientific Visualization Studio
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