  Aggregated journal-journal citation networks based on the Journal Citation
Reports 2004 of the Science Citation Index (5968 journals) and the Social
Science Citation Index (1712 journals) are made accessible from the perspective
of any of these journals. The user is thus able to analyze the citation
environment in terms of links and graphs. Furthermore, the local impact of a
journal is defined as its share of the total citations in the specific
journal's citation environments; the vertical size of the nodes is varied
proportionally to this citation impact. The horizontal size of each node can be
used to provide the same information after correction for within-journal
(self)-citations. In the "citing" environment, the equivalents of this measure
can be considered as a citation activity index which maps how the relevant
journal environment is perceived by the collective of authors of a given
journal. As a policy application, the mechanism of interdisciplinary
developments among the sciences is elaborated for the case of nanotechnology
journals.
