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Hot Papers - papers that receive a large number of citations soon after publication, relative to other papers in the same field and age. More precisely, they are papers published in the past two years that received a number of citations in the most recent two-month period that places them in the top 0.1% of papers in the same field.
Highly Cited Papers - Minimum number of citations received by the top 1% of papers in the research field published in the specified year.
Active journal titles eligible for inclusion in Essential Science Indicators
For more information about fully utilizing the Web of Knowledge/Web of Science, check out Mason Libraries InfoGuide: Cited Reference Searching: Web of Knowledge.