  In Coulomb gauge a longitudinal electric field is generated instantaneously
with the creation of a static quark-antiquark pair. The field due to the quarks
is a sum of two contributions, one from the quark and one from the antiquark,
and there is no obvious reason that this sum should fall off exponentially with
distance from the sources. We show here, however, from numerical simulations in
pure SU(2) lattice gauge theory, that the color Coulomb electric field does in
fact fall off exponentially with transverse distance away from a line joining
static quark-antiquark sources, indicating the existence of a color Coulomb
flux tube, and the absence of long-range Coulomb dipole fields.
