What is the minimum visibility required for alternate airports, according to regulations for high mins captains?

The minimum visibility required for alternate airports specifically for high minimums captains is 1 statute mile (sm). This requirement is established to ensure safety during approach and landing at alternate airports when weather conditions may be below standard. High minimums captains are those who must adhere to stricter visibility and ceiling requirements due to their limited experience, usually in terms of flight hours or type of aircraft they are operating. This regulation aims to mitigate risks associated with reduced situational awareness in challenging weather conditions, protecting both the crew and passengers by ensuring that they have adequate visual reference while making critical landing decisions. Other visibility options are greater than 1 sm, which would not apply to the minimum visibility standard specifically set for high mins captains under the regulations.