the solar wind slows down. They probably represent self-contained structures that have detached from the interplanetary magnetic field. At a distance of about 113 AU, Voyager 1 detected a 'stagnation region' within the heliosheath. In this region, the solar wind slowed to zero, the magnetic field intensity doubled and high-energy electrons from the galaxy increased 100-fold. At about 122 AU, the spacecraft entered a new region that Voyager project scientists called the "magnetic highway", an area still under the influence of the Sun but with some dramatic differences. Heliopause The heliopause is the theoretical boundary where the Sun's solar wind is stopped by the interstellar medium; where the solar wind's strength is no longer great enough to push back the stellar winds of the surrounding stars. This is the boundary where the interstellar medium and solar wind pressures balance. The crossing of the heliopause should be signaled by a sharp drop in the temperature of solar wind-charged particles, a change in the direction of the magnetic field, and an increase in the number of galactic cosmic rays. In May 2012, Voyager 1 detected a rapid increase in such cosmic rays (a 9% increase in a month, following a more gradual increase of 25% from Jan. 2009 to Jan. 2012), suggesting it was approaching the heliopause. Between late August and early September 2012, Voyager 1 witnessed a sharp drop in protons from the sun, from 25 particles per second in late August, to about 2 particles per second by early October. In September 2013, NASA announced that Voyager 1 had crossed the heliopause as of 25 August 2012. This was at a distance of from the Sun. Contrary to predictions, data from Voyager 1 indicates the magnetic field of the galaxy is aligned with the solar magnetic field. On November 5, 2018, the Voyager 2 mission detected a sudden decrease in the flux of low-energy ions. At the same time, the level of cosmic rays increased. This demonstrated that the spacecraft crossed the heliopause at a distance of from the Sun. Unlike Voyager 1, the Voyager 2 spacecraft did not detect interstellar flux tubes while crossing the heliosheath. NASA collected data from the heliopause during the SHIELDS mission in 2021. Heliotail The heliotail is the tail of the heliosphere, and thus the Solar System's tail. It can be compared to the tail of a comet (however, a comet's tail does not