In this paper we report the detection of a new
heliospheric 2β3 kHz radio emission event by the
Voyager 1 spacecraft, the first to be observed during solar
cycle 23. The new event started on Nov. 1, 2002, and is
believed to be associated with a strong interplanetary shock
that originated from a period of intense solar activity in
early April 2001. Following previous interpretations of
events of this type, we assume that the radio emission is
produced when the interplanetary shock interacted with the
heliopause, which is the boundary between the solar wind
and the interplanetary medium. From the onset time of the
radio emission and a simple model for the propagation
speed of the interplanetary shock, the heliocentric radial
distance to the nose of the heliopause can be calculated, and
is about 153 to 158 AU, depending on the parameters used.
From computer simulations that give the ratio of the radial
distance to the termination shock to the radial distance to
the heliopause, the distance to the termination shock can
also be calculated and is estimated to be about 101 to
108 AU