When a vacancy occurs in the office of United States senator, the governor may, at least five days after the date of the vacancy but within 30 days after the date of the vacancy, appoint a qualified individual to fill the vacancy temporarily until the results of the special election called to fill the vacancy are certified. If a special election is not called for the reasons set out in AS 15.40.140, the individual shall fill the vacancy temporarily until the results of the next general election are certified.