  Electromagnetic field together with zero-mass charges moving in this field
form a well-behaved semi-dissipative dynamical system -- Electrodynamics of
Massless Charges (EMC). We give equations of EMC, argue that EMC is an adequate
theory for calculating pulsar magnetospheres, give an illustrative numerical
calculation (showing that bolometric luminosity of an aligned rotator is
approximately equal to half the spin-down power). EMC looks like a portion of
the full pulsar theory that will resolve the already calculated bolometric
luminosity into light curves and spectra.
