Question: Midnattssol in english is which natural phenomenon that occurs in the summer months in places north of the Arctic Circle or south of the Antarctic Circle?

Context articles: Arctic Circle
Arctic policy of Russia
Jewish law in the polar regions
Polar night
Polar circle
Midnight sun
Antarctic Circle
Midnattssol
Coast Guard Arctic Service Medal
Bharati (research station)

The Arctic Circle is the most northerly of the abstract five major circles of latitude as shown on maps of the Earth.
 It marks the northernmost point at which the noon sun is just visible on the northern winter solstice and the southernmost point at which the midnight sun is just visible on the northern summer solstice.
 The region north of this circle is known as the Arctic, and the zone just to the south is called the Northern Temperate Zone.
 North of the Arctic Circle, the sun is above the horizon for twenty-four continuous hours at least once per year (and therefore visible at midnight) and below the horizon for twenty-four continuous hours at least once per year (and therefore not visible at noon); this is also true within the equivalent polar circle in the Southern Hemisphere, the Antarctic Circle.
The Arctic policy of Russia is the domestic and foreign policy of the Russian Federation with respect to the Russian region of the Arctic.
 The Russian region of the Arctic is defined in the "Russian Arctic Policy" as all Russian possessions located north of the Arctic Circle.
 (About one-fifth of Russia's landmass is north of the Arctic Circle.)
 Russia is one of five countries bordering the Arctic Ocean.
 In 2011, out of 4 million inhabitants of the Arctic, roughly 2 million lived in arctic Russia, making it the largest arctic country by population.
 However, in recent years Russia's Arctic population has been declining.
The observance of Jewish law (halakhah) in the polar regions of Earth presents unique problems.
 Many mitzvot, such as Jewish prayer and the Jewish sabbath, rely on the consistent cycle of day and night in 24-hour periods that is commonplace in most of the world.
 However, north of the Arctic Circle (and south of the Antarctic Circle) a single period of daylight can last for a month or more during the summer, and the night lasts for a similar length of time in the winter.
 The question for religious Jews that live in or visit these regions is how to reconcile the observed length of days in the polar regions with common practice elsewhere in the world.
 Should a "day" be defined solely based on sunrise and sunset, even if these events do not occur for long stretches of time; or should the definition of a polar "day" be consistent with the length of a day in the rest of the world?
The polar night occurs in the northernmost and southernmost regions of the Earth when the night lasts for more than 24 hours.
 This occurs only inside the polar circles.
 The opposite phenomenon, the polar day, or midnight sun, occurs when the Sun stays above the horizon for more than 24 hours.
 "Night" is understood as the center of the Sun being below a free horizon.
 Since the atmosphere bends the rays of the Sun, the polar day is longer than the polar night, and the area that is affected by polar night is somewhat smaller than the area of midnight sun.
 The polar circle is located at a latitude between these two areas, at the latitude of approximately 66.5 degrees.
 In the most northern city of Sweden, Kiruna, at 67°51'N, the polar night lasts for around 28 twenty-four-hour periods, while the midnight sun lasts around 50 twenty-four-hour periods.
 While it is day in the Arctic Circle it is night in the Antarctic Circle.
A polar circle is either the Arctic Circle or the Antarctic Circle.
 On Earth, the Arctic Circle is located at a latitude of 9°′″  N, and the Antarctic Circle is located at a latitude of 9°′″  S.
The midnight sun is a natural phenomenon that occurs in the summer months in places north of the Arctic Circle or south of the Antarctic Circle, when the sun remains visible at the local midnight.
 Around the summer solstice (approximately 21 June in the Northern Hemisphere and 22 December in the Southern Hemisphere) the sun is visible for the full 24 hours, given fair weather.
 The number of days per year with potential midnight sun increases the closer towards either pole one goes.
 Although approximately defined by the polar circles, in practice the midnight sun can be seen as much as 55 miles (90 km) outside the polar circle, as described below, and the exact latitudes of the farthest reaches of midnight sun depend on topography and vary slightly year-to-year.
The Antarctic Circle is the most southerly of the five major circles of latitude that mark maps of the Earth.
 The region south of this circle is known as the Antarctic, and the zone immediately to the north is called the Southern Temperate Zone.
 South of the Antarctic Circle, the sun is above the horizon for 24 continuous hours at least once per year (and therefore visible at midnight) and (at least partially) below the horizon for 24 continuous hours at least once per year (and therefore not fully visible at noon); this is also true within the equivalent polar circle in the Northern Hemisphere, the Arctic Circle.
Midnattssol (French: "Jour polaire" , English: Midnight sun ) is a Swedish-French crime television series from 2016.
 It started airing on SVT on 23 October 2016.
The Coast Guard Arctic Service Medal was established on 20 May 1976 by Commandant of the Coast Guard Admiral Owen W. Siler.
 The medal is awarded to any member of the United States Coast Guard who performs twenty one days of consecutive duty afloat or ashore north of the Arctic Circle.
 Air crews flying in and out of areas north of the Arctic Circle may also be awarded the medal for 21 days of non-consecutive service.
 The medal depicts a polar bear under the North Star, while the reverse side carries the Coast Guard Shield.
Bharati (Hindi: भारती) is an Antarctic research station commissioned by India.
 It is India's third Antarctic research facility and one of two active Indian research stations, alongside Maitri.
 India's first committed research facility, Dakshin Gangotri, is being used as a supply base.
 India has demarcated an area beside Larsemann Hills at 69°S, 76°E for construction.
 The research station has been operational since March 18, 2012, though it is still being run on trial basis and formal launch is awaited.
 Since its completion, India has become one of nine nations to have multiple stations within the Antarctic Circle.
 Bharati's research mandate focuses on oceanographic studies and the phenomenon of continental breakup.
 It also facilitates research to refine the current understanding of the Indian subcontinent's geological history.
 News sources have referred to the station variously as "Bharathi", "Bharti" and "Bharati".