  In this study, the dynamic of guided ionization wave (IW) generated by an
atmospheric pressure plasma jet (APPJ) device in plasma gun configuration is
experimentally investigated. The present work focuses on the properties of the
intense electric field (EF) driving the IW. Taking advantages of APPJs to
produce guided and reproducible IWs, the induced EF vector is characterized
spatially and temporally along the direction of propagation. With this
approach, EF vector mapping of guided IWs have been measured and documented for
the first time. In the first part, the propagation within a glass tube of the
first IW is investigated. Under the present conditions, a second guided IW is
observed and propagates, leading to the formation of a guided streamer. The EF
due to transient charge deposited on the wall surface is observed, particularly
at the end of the tube. In the second part, one reports on the EF vector
mapping under a dielectric substrate in contact with guided IWs. EF strength up
to 55 kV cm$^{-1}$ has been measured and corroborates prior results from
predictive numerical simulations. Intriguing configurations of the EF lines
will be of significant interest to validate theoretical models in order to
refine the non-equilibrium plasma chemistry kinetics. Furthermore, this
preliminary work provides important insights into various applications
involving IW driven discharges such as liquid activation, environmental
treatments, plasma medicine, active flow control and plasma agriculture.
