Systems and methods establish plasma in a rotating magnetic field. An exemplary embodiment is a plasma thruster that establishes a first transverse magnetic field with respect to a system axis of a plasma propulsion system; establishes a second transverse magnetic field oriented orthogonally to the first transverse magnetic field, wherein the second transverse magnetic field is out of phase with the first transverse magnetic field; and establishes a magnetic field aligned with the system axis using a plurality of magnet elements oriented along the system axis. A plasma containment portion defines an interior region, wherein an interior region of a plasma containment portion accommodates a plasma that is established by a rotating magnetic field component that is cooperatively established by the first transverse magnetic field and the second transverse magnetic field, and wherein the plasma is accelerated out of the plasma containment portion by magnetic forces to generate a propulsion force. 1. A method, comprising: establishing a first transverse magnetic field with respect to a system axis of a plasma propulsion system; establishing a second transverse magnetic field oriented orthogonally to the first transverse magnetic field, wherein the second transverse magnetic field is out of phase with the first transverse magnetic field; establishing a magnetic field aligned with the system axis using a plurality of magnet elements oriented along the system axis, wherein a plasma containment portion defines an interior region, wherein the interior region of the plasma containment portion accommodates a plasma that is established by a rotating magnetic field component that is cooperatively established by the first transverse magnetic field and the second transverse magnetic field, and wherein the plasma is accelerated out of the plasma containment portion by magnetic forces to generate a propulsion force; and introducing neutral gas particles into the interior region of the plasma containment portion, wherein the neutral gas particles undergo charge exchange collisions with particles of the plasma thereby increasing a number of particles magnetically accelerated per ionizing collision thereby reducing total system energy loss to ionization. 2. The method of claim 1, further comprising: inputting a first oscillating current into a first plurality of magnetic field coils configured to establish the first transverse magnetic field; and inputting a second oscillating current into a second plurality of magnetic field coils configured to establish the second transverse magnetic field, wherein the second plurality of magnetic field coils are oriented orthogonally to the first plurality of magnetic field coils. 3. The method of claim 2, wherein the second oscillating current is out of phase with the first oscillating current. 4. The method of claim 2, wherein the first oscillating current is a first sinusoidal current, and wherein the second oscillating current is a second sinusoidal current that is out of phase with the first oscillating current. 5. The method of claim 1, further comprising: establishing a closed conducting path in a plane orthogonal to the system axis using a plurality of electrical conductors oriented along the system axis. 6. The method of claim 1, further comprising: introducing a propellant mass into the plasma containment portion, wherein the plasma is established from ionization of a portion of the introduced propellant mass. 7. The method of claim 1, further comprising: establishing a gradient magnetic field along the system axis outward towards an exhaust of the plasma containment portion, wherein the gradient magnetic field is established by a plurality of closed electrical conductors, and wherein the gradient magnetic field accelerates the plasma towards an exhaust of the plasma containment portion. 8. The method of claim 1, further comprising: sequentially pulsing a plurality of magnetic coils serially arranged over the plasma containment portion and along the system axis, wherein the plurality of magnetic coils increase a magnetic field gradient along the system axis outward towards an exhaust of the plasma containment portion. 9. A plasma propulsion system, comprising: a first plurality of magnetic field coils configured to receive a first oscillating current that produces a first transverse magnetic field with respect to a system axis of the plasma propulsion system; a second plurality of magnetic field coils oriented orthogonally to the first plurality of magnetic field coils, and configured to receive a second oscillating current that produces a second transverse magnetic field, wherein the second oscillating current is out of phase with the first oscillating current; a plurality of electrical conductors oriented along the system axis, wherein the plurality of electrical conductors form a closed conducting path in a plane orthogonal to the system axis; a plurality of magnetic elements oriented along the system axis that produce a magnetic field aligned with the system axis; a plasma containment portion defining an interior region, wherein the interior region of the plasma containment portion is configured to accommodate a plasma that is established by a rotating magnetic field component that is cooperatively established by the first oscillating current flowing through the first plurality of magnetic field coils and the second oscillating current flowing through the second plurality of magnetic field coils, wherein the plasma is accelerated out of the plasma containment portion by magnetic forces to generate a propulsion force; and a manifold configured to introduce neutral gas particles into the interior region of the plasma containment portion, wherein the neutral gas particles undergo charge exchange collisions with particles of the plasma thereby increasing a number of particles magnetically accelerated per ionizing collision thereby reducing total system energy loss to ionization. [Claims 10-21 dependent on Claim 9]. PRIORITY CLAIM: This application claims the benefit of and priority to co-pending U.S. utility application entitled 'Rotating Magnetic Field Thruster', having application Ser. No. 61/372,001, filed Aug. 9, 2010. BACKGROUND: Electric-based propulsion systems have been developed to address limitations in chemical propulsion systems, but face primary energy loss mechanisms due to ionization loss. The maximum electrical power onboard space vehicles limits thrust production, necessitating more efficient systems. SUMMARY AND DETAILED DESCRIPTION: The rotating magnetic field thruster 100 (Electrodeless Lorentz Force / ELF thruster) creates a magnetized plasma 120 (Field Reversed Configuration / FRC) within a containment portion 118 using rotating magnetic fields (RMF). Two orthogonal coil pairs driven with out-of-phase oscillating signals create a composite rotating transverse field. Synchronous motion of electrons magnetized in this field produces a large azimuthal current Jθ (up to tens of kA), reversing the internal axial bias field and detaching the plasma magnetically from external coils and containment walls. Coupled with an applied magnetic field gradient (e.g., within a conical discharge section), a substantial Jθ x Br electromagnetic Lorentz force accelerates and ejects the plasmoid out of the exhaust portion 116. Furthermore, neutral entrainment (NE) is utilized: cold neutral gas is introduced into the translating plasma path, causing charge-exchange collisions that accelerate neutral particles without requiring additional ionizing energy, drastically reducing overall ionization debt and allowing highly efficient operation across variable Isp ranges (500-5000 s) with various propellants including nitrogen, air, oxygen, and xenon.