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Jan 20, 2014 · English - Southern England. Jan 20, 2014. #4. To impact means to strike something forcefully, which may well seem negative, but to impact on something means to have a strong effect/influence on someone or something but not necessarily in a negative way. KB beat me to it.
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Measure of mean number of citations per article of an academic journal
The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science. Wikipedia
