FIGURE 6.1.1 A simulated view of the Sun and inner heliosphere seen from above the pole illustrates the revamped trajectory of Solar Probe Plus during its 19 near-Sun passes inside 30 RS. The spacecraft will spend nearly 1,000 hours within 20 RS of the Sun and 30 hours within 10 RS. The 3-month near-ecliptic orbit allows repeated measurements of the slow wind from the streamer belt as well as of the fast wind from equatorial coronal holes. Terrestrial observatories, from both ground and space, will provide global context measurements. SOURCE: NASA, Solar Probe Plus: Report of the Science and Technology Definition Team, NASA/TM-2008-214161, NASA Goddard Space Flight Center, Greenbelt, Md., July 2008.
The survey committee notes that the resources assumed in crafting this decadal survey’s recommended programs are barely adequate to make the required progress; with reduced resources, progress will be inadequate. It is also evident that with increased resources, the cadence of the assets by which the nation pursues its program could be increased with a concomitant increase in the pace of scientific discovery and societal value.