  Magnetic fields govern the plasma dynamics in the outer layers of the solar
atmosphere, and electric fields acting on neutral atoms that move across the
magnetic field enable us to study the dynamical coupling between neutrals and
ions in the plasma. In order to measure the magnetic and electric fields of
chromospheric jets, the full Stokes spectra of the Paschen series of neutral
hydrogen in a surge and in some active region jets that took place at the solar
limb were observed on May 5, 2012, using the spectropolarimeter of the Domeless
Solar Telescope at Hida observatory, Japan. First, we inverted the Stokes
spectra taking into account only the effect of magnetic fields on the energy
structure and polarization of the hydrogen levels. Having found no definitive
evidence of the effects of electric fields in the observed Stokes profiles, we
then estimated an upper bound for these fields by calculating the polarization
degree under the magnetic field configuration derived in the first step, with
the additional presence of a perpendicular (Lorentz type) electric field of
varying strength. The inferred direction of the magnetic field on the plane of
the sky (POS) approximately aligns to the active region jets and the surge,
with magnetic field strengths in the range 10 G < B < 640 G for the surge.
Using magnetic field strengths of 70, 200, and 600 G, we obtained upper limits
for possible electric fields of 0.04, 0.3, and 0.8 V/cm, respectively. Because
the velocity of neutral atoms of hydrogen moving across the magnetic field
derived from these upper limits of the Lorentz electric field is far below the
bulk velocity of the plasma perpendicular to the magnetic field as measured by
the Doppler shift, we conclude that the neutral atoms must be highly frozen to
the magnetic field in the surge.
