  We describe spatiotemporal patterns in a network of identical van der Pol
oscillators coupled in a two-dimensional geometry. In this study, we show that
the system under study demonstrates a plethora of different spatiotemporal
structures including chimera states when the coupling parameters are varied.
Spiral wave chimeras are formed in the network when the coupling strength is
rather large and the coupling range is short enough. Another type of chimeras
is a target wave chimera. It is shown that solitary states play a crucial role
in forming an incoherence cluster of this chimera state. They can also spread
within the coherence cluster. Furthermore, when the coupling range increases,
the target wave chimera evolves to the regime of solitary states which are
randomly distributed in space. Growing the coupling strength leads to the
attraction of solitary states to a certain spatial region, while the
synchronous regime is set in the other part of the system. This spatiotemporal
pattern represents a solitary state chimera, which is firstly found in the
system of continuous-time oscillators. We offer the explanation of these
phenomena and describe the evolution of the regimes in detail.
