Question: How many regions is the heliosphere divided in
About the article "Solar System", section "Heliopause".

Candidate passages:
The heliosphere is divided into two separate regions.
The solar wind travels at roughly 400 km/s until it collides with the interstellar wind; the flow of plasma in the interstellar medium.
The collision occurs at the termination shock, which is roughly 80–100 AU from the Sun upwind of the interstellar medium and roughly 200 AU from the Sun downwind.
Here the wind slows dramatically, condenses, and becomes more turbulent, forming a great oval structure known as the heliosheath.
This structure is believed to look and behave very much like a comet's tail, extending outward for a further 40 AU on the upwind side but tailing many times that distance downwind; evidence from the Cassini and Interstellar Boundary Explorer spacecraft has suggested that it is forced into a bubble shape by the constraining action of the interstellar magnetic field.
The outer boundary of the heliosphere, the heliopause, is the point at which the solar wind finally terminates and is the beginning of interstellar space.
Both "Voyager 1" and "Voyager 2" are reported to have passed the termination shock and entered the heliosheath, at 94 and 84 AU from the Sun, respectively.
"Voyager 1" is also reported to have reached the heliopause.
The shape and form of the outer edge of the heliosphere is likely affected by the fluid dynamics of interactions with the interstellar medium as well as solar magnetic fields prevailing to the south, e.g.
it is bluntly shaped with the northern hemisphere extending 9 AU farther than the southern hemisphere.
Beyond the heliopause, at around 230 AU, lies the bow shock, a plasma "wake" left by the Sun as it travels through the Milky Way.
Due to a lack of data, the conditions in local interstellar space are not known for certain.
It is expected that NASA's Voyager spacecraft, as they pass the heliopause, will transmit valuable data on radiation levels and solar wind back to Earth.
How well the heliosphere shields the Solar System from cosmic rays is poorly understood.
A NASA-funded team has developed a concept of a "Vision Mission" dedicated to sending a probe to the heliosphere.
Solar Orbiter (SolO) is a planned Sun-observing satellite, under development by the European Space Agency (ESA).
The mission will be launched with an Atlas V from the Cape Canaveral AFS in Florida in July 2017.
SolO is intended to perform detailed measurements of the inner heliosphere and nascent solar wind, and perform close observations of the polar regions of the Sun, which is difficult to do from Earth, both serving to answer the question 'How does the Sun create and control the heliosphere?
'The Solar Orbiter will make observations of the Sun from an eccentric orbit moving as close as ~60 solar radii (RS), or 0.284 astronomical units (AU), placing it slightly inside Mercury's perihelion of 0.3075 AU. 
Heliospheric current sheet.
The heliospheric current sheet is a ripple in the heliosphere created by the Sun's rotating magnetic field.
Extending throughout the heliosphere, it is considered the largest structure in the Solar System and is said to resemble a "ballerina's skirt". 
  How and where do the solar wind plasma and magnetic field originate in the corona?
How do solar transients drive heliospheric variability?
How do solar eruptions produce energetic particle radiation that fills the heliosphere?
How does the solar dynamo work and drive connections between the Sun and the heliosphere?  
The heliosphere is a vast region of space surrounding the Sun, a sort of bubble filled by the interplanetary medium and extending well beyond the orbit of Pluto.
Plasma "blown" out from the Sun, known as the solar wind, creates and maintains this bubble against the outside pressure of the interstellar medium, the hydrogen and helium gas that permeates our galaxy.
The solar wind flows outward from the Sun until encountering the termination shock, where motion slows abruptly.
The Voyager spacecraft have actively explored the outer reaches of the heliosphere, passing through the shock and entering the heliosheath, a transitional region which is in turn bounded by the outermost edge of the heliosphere, called the heliopause.
The overall shape of the heliosphere is controlled by the interstellar medium, through which it is traveling, as well as the Sun, and does not appear to be perfectly spherical.
The limited data available and unexplored nature of these structures has resulted in many theories.
On September 12, 2013, NASA announced that Voyager 1 had exited the heliosphere on August 25, 2012, when it measured a sudden increase in plasma density of about forty times.
Because the heliopause marks one boundary between the Sun's sphere of influence and the rest of the galaxy, a spacecraft such as Voyager 1 which has departed the heliosphere can be said to have reached interstellar space.