| Extinction or absorption | phys.absorption |
| Acceleration | phys.acceleration |
| Atomic/molecular excitation | phys.atmol.excitation |
| Ionization, jump from bound to unbound energy state | phys.atmol.ionization |
| Transition between states | phys.atmol.transition |
| Molecular dissociation | phys.mol.dissociation |
| Polarization | phys.polarization |
| Astrophysical phenomenon, process or feature | process |
| Generic absorption of wave or particle | process.absorption |
| Acceleration (particles, etc.) | process.acceleration |
| Mass accretion | process.accretion |
| Gravitational collapse | process.collapse |
| Conduction | process.conduction |
| Convection | process.convection |
| Diffusion | process.diffusion |
| Circum-object disk with thickness H < R and R_in < R_out | process.disk |
| Eclipse of two physically related objects | process.eclipse |
| Generic emission of wave or particle | process.emission |
| Sudden brightening, outburst | process.eruption |
| Explosion | process.explosion |
| Excitation, jump in a higher energy (bound) state | process.excitation |
| Gravitational lensing | process.gravitation.lensing |
| Non-resolved gravitational lensing | process.gravitation.micro-lensing |
| Gravitational wave | process.gravitation.wave |
| Generic instability | process.instability |
| Generic interaction between two or more distinct objects | process.interaction |
| Maser (as a process) | process.maser |
| Mass loss | process.mass-loss |
| Ejection, loss of a distinct body of mass | process.mass-loss.ejection |
| Mass-loss through a collimated jet | process.mass-loss.jet |
| mass-loss through a poorly collimated wind | Process.mass-loss.wind |
| Merging of two or more distinct objects | process.merging |
| Nuclear reactions, nucleosynthesis | process.nucleosynthesis |
| Occultation of two physically unrelated objects | process.occultation |
| Pulsation | process.pulsation |
| Non-radial pulsation | process.pulsation.non-radial |
| Radial pulsation | process.pulsation.radial |
| Radiation mechanisms: non-thermal | process.radiation.non-thermal |
| Radiation mechanisms:thermal | process.radiation.thermal |
| Redshift | process.redshift |
| Circum-object ring with thickness H < R and R_in ~ R_out | process.ring |
| Recombination, from unbound to bound energy state | process.recombination |
| Rotation | process.rotation |
| Scattering | process.scattering |
| Shock front/wave(HD, MHD, Ionization, etc.) | process.shock |
| Distinct physical region on an object with different properties | process.spot |
| Starburst | process.starburst |
| Change in some property with time | process.variation |
| Generic sudden change with time | process.variation.burst |
| Cyclic, periodic change | process.variation.cyclic |
| Rapid change with time followed by a return to normalcy | process.variation.flare |
| Sudden change of frequency | process.variation.glitch |
| Very luminous state of variable object, high state | process.variation.high-state |
| Quiescent or low luminsous state of variable object | process.variation.low-state |
| Semi-regular or quasi-periodic variation | process.variation.quasi-periodic |
| Temporary, non-periodic change | process.variation.transient |