I've observed that in the English language, there exist several terms denoting the luminous remnants of sunlight in the sky after the sun has set.
For instance, the term afterglow evokes a particularly effulgent quality of scattered sunlight after sunset. On the other hand, gloaming (an exceptionally rare word) denotes a more subdued and faint light, while dusk implies a darker stage of twilight. Although the term crepuscular light bears a similar connotation, it carries a slightly different nuance with a hint of technicality, especially in more specialized contexts.
As discerning readers may have noted, numerous words in the English language refer to the colours of a sunset, but I have yet to discover a term which precisely conveys the same effervescent glow while alluding to a sunrise. A cursory glance at the dictionary's definition of afterglow confirms that it is explicitly associated with the period after the sun has set.
One word which seems to convey the intended meaning is foreglow, which appears to describe precisely the glow of light appearing in the sky preceding sunrise. Although I tend to lean towards this word, I am unsure, however, if it may be considered esoteric and could potentially perplex native speakers.
May a perspicacious native speaker confirm whether these terms can be used to describe the glow of a sunrise?
Personally, if I were asked spontaneously without consulting a thesaurus, I would use the word twilight immediately. While the phrase "sunrise twilight" appears in various literary corpora, I would be most obliged to learn of any more precise terms.
P.S. Although dawn, cockcrow, and daybreak do indicate a specific moment in time, I deem them to be irrelevant to the present discussion.