Ƙananan Ƙarƙashin Duhu

The Small Dark Spot, wani lokacin kuma ana kiransa Dark Spot 2 ko The Wizard's Eye, wani nau'i ne na waje a duniya Neptune .  Ita ce guguwa ta biyu mafi girma a kudancin duniya a shekarar 1989, lokacin da Voyager 2 ta tashi a duniya. Lokacin da Hubble Space Telescope ya lura da Neptune a cikin 1994, guguwar ta ɓace.

 Tarihin lura 
The Small Dark Spot was discovered in 1989 by the Voyager 2 spacecraft along with the Great Dark Spot and Scooter (a bright fast moving cloud located between the two giant storms). The Small Dark Spot was found at a latitude of 54° South while rotating East around Neptune with a period of 16.1 hours. Unlike the Great Dark Spot (which has some of the highest measured wind speeds in the Solar System), wind speed data was not taken for the Small Dark Spot. The spot was also observed without any white "companion clouds" present around its edges, again in contrast to the Great Dark Spot. When NASA pointed the Hubble Space Telescope toward Neptune in 1994, both giant spots were no longer present.

 Halayen jiki 
Sunan laƙabi "Wizard's Eye" da aka ba wannan guguwa ya fito ne daga fasalulluka na musamman waɗanda ke haifar da bayyanar ido mai ban sha'awa. Gabaɗaya Ƙananan Dark Spot ya fi ƙanƙanta amma a kan wannan tsari na girman kamar Babban Dark Spot kuma yana juyawa game da 30 ° zuwa kudu kuma tare da lokacin kimanin awanni 2 ya fi guguwa mafi girma.

Rashin duhu na wannan guguwa wanda ya haifar da tsari gaba ɗaya don siffar ido an kafa shi ne ta hanyar juyawa mai juyawa wanda ya tsotse yanayi a ciki zuwa tsakiyar duniya.[1] Wannan aikin jan yanayi zuwa ƙasa ya haifar da rami a cikin girgije na methane na Neptune kuma ya ba guguwar sautin shuɗi mai duhu.[2] Har ila yau, a cikin yankin duhu na guguwar akwai layi mai kaifi wanda zai iya nuna manyan iskõki marasa ganuwa, duk da cewa ba a taɓa ɗaukar ainihin ma'auni ba.[1]

Yankin tsakiya mai haske wanda ke wakiltar ɗalibin siffar ido ya samo asali ne daga fararen girgije na kankara da ke fitowa daga tsakiyar guguwar. A cikin rikice-rikice na waɗannan girgije na tsakiya akwai wasu manyan tsari, gami da siffar V daban a gefen Gabas na guguwar da ke nuna juyawa da aka yi imani da guguwar. Wadannan girgije sun hada da wannan methane-ice wanda ke samar da irin wannan girgije da ake kira "abokan girgije" da ke kusa da gefen wasu manyan guguwa a duniya; duk da haka, Small Dark Spot ba shi da wani daga cikin waɗannan girgije na aboki a bayyane a cikin bincikensa na 1989. Bugu da ƙari, ba a lura da girgije ba a yankin wurin a cikin binciken duniya na 1994.

 Rashin 
Bayan an lura da shi ta Voyager 2 a cikin 1989, ba za a sake lura da duniyar a cikin babban ƙuduri ba har sai Hubble Space Telescope ya juya ra'ayinsa a cikin 1994. A cikin 1994 da kuma abubuwan da suka biyo baya, manyan guguwa biyu sun ɓace. Guguwar da ta haifar da Babban Dark Spot, duk da haka, na iya ci gaba a ƙasa kamar yadda aka tabbatar da ci gaba da hadari. Ƙananan Dark Spot ba shi da wani abokin girgije wanda za a yi la'akari da tsira daga guguwar da ta haifar da wurin. Duk da yake hanyar da aka yi la'akari da ita don lalacewa da mutuwar manyan vortexes a kan Neptune shine kusantarsu zuwa ma'auni inda duniyar ke da mita 400 a kowace raƙuman jet na biyu, wannan guguwa (da sauransu) na iya lalacewa daga hanyoyin da ba a bayyana su ba na Yanayin Neptune.

 Dubi kuma 

 Dragon Storm (astronomy) 
 Guguwa ta waje
 Babban wuri mai duhu
 Oval BA
 Babban Red Spot
 Babban White Spot

 Manazarta 

 Ƙarin karantawa