Approximately 23,000 of the top academic journals are ranked by impact by SCImago. The journal list is divided into quartiles, the top 25% of which are identified as Q1.
The SCImago Journal Rank (SJR) indicator is a measure of the scientific influence of scholarly journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where the citations come from. SCImago allows researchers to identify the best journals published within their discipline.
A publishing track record that includes a high percentage of Q1 journals significantly increases a researcher's impact.