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The two most used citation impact indicators in the assessment of scientificjournals are, nowadays, the impact factor and the h-index. However, bothindicators are not field normalized (vary heavily depending on the scientificcategory) which makes them incomparable between categories. Furthermore, theimpact factor is not robust to the presence of articles with a large number ofcitations, while the h-index depends on the journal size. These limitations arevery important when comparing journals of different sizes and categories. Analternative citation impact indicator is the percentage of highly citedarticles in a journal. This measure is field normalized (comparable betweenscientific categories), independent of the journal size and also robust to thepresence of articles with a high number of citations. This paper empiricallycompares this indicator with the impact factor and the h-index, consideringdifferent time windows and citation percentiles (levels of citation forconsidering an article as highly cited compared to others in the same year andcategory).

An indicator of journal impact that is based on calculating a journal's percentage of highly cited publications