Radio frequency atmospheric pressure glow discharge（RF APGD） plasmas which are produced by the plasma generators with a bare-metallic electrode configuration exhibits the features of high concentration of chemically reactive species

low plasma jet temperatures

and convenient controllability

etc. Thus

it is widely used in the fields of materials processing and modification

food engineering

environmental engineering

and biomedical science

etc. Consequently

to study the influences of discharge current density on the discharge characteristics of RF APGDs

taking high purity helium as the working gas

we employed the one-dimensional transient and two-dimensional quasi-steady fluid models to simulate the characteristics in the discharge region and plasma jet region of the RF APGDs

respectively. The influences of the discharge current density on the characteristics of the RF APGD plasmas were revealed. The modeling results show that:（1） In the discharge region

both the species number densities and the gas temperatures increase significantly with increasing in the discharge current density; and when the current density is high enough

the discharge mode transfers from the α mode to the γ mode.（2） In the plasma jet region

on one hand

both the gas temperature and plasma density at the outlet of the plasma generator increase with increasing in the discharge current density; on the other hand

the increase of the gas temperature will increase some deionization reaction rates

and subsequently

leads to a fast decay of the electrons and ions in the plasma jet region.Therefore

non-monotonic variations of the species number densities occur at different spatial locations with the increase of the discharge current density.