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17.11.2024, 10:23
Огромный объект возле Солнца
Что за огромный объект возле Солнца?
 
Комментарии 56
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RaVest
28.03.2014 21:29
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Учите мат часть по LASCO:
http://lasco-www.nrl.navy.mil/index.php?p=content/intro |
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RaVest
28.03.2014 21:19
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Да ёперный театр, ребята! Ну чс слово, вспомогательная школа.
ЧИТАЙТЕ: DESCRIPTION OF THE CONTENTS OF 'nominal_roll_attitude.dat' The 'nominal_roll_attitude.dat' file contains the value for the nominal roll angle of SOHO at any given time, in tabulated form. The nominal roll angle always used to be zero. However, with the high gain antenna parked in a fixed position since the summer of 2003, SOHO has to turn upside down during half of its halo orbit in order to send data to Earth through the high gain antenna. In other words, the nominal roll switches between 0 and 180 degrees every 3 months. Up until 2010-10-29, if the roll angle of SOHO is zero, the spacecraft +Z axis is aligned with the North Pole of the Sun ("right side up"). If the roll angle is 180, spacecraft -Z axis is aligned with the North Pole of the Sun ("upside down"). Since 2010-10-29, the reference for the nominal roll attitude of the spacecraft no longer is the solar North Pole, but the Ecliptic North Pole. Therefore, the roll angle with respect of the solar rotation axis goes from -7.25 degrees in June to 7.25 degrees in December. The files in http://sohowww.nascom.nasa.gov/data/ancillary/attitude/predictive contain information about the roll attitude every 10 minutes. The value of the nominal roll attitude in the file will be either 0 or 180. There will be no actual roll determination to refine this figure, because file reflects the value of the nominal spacecraft roll, not the actual spacecraft roll. For this reason, the value should only be used for periods when the spacecraft is in Normal Mode (i.e. not during manoeuvres or other special operations). The time stamp for each roll change reflects the moment when the new nominal roll becomes effective: - The time stamp typically corresponds to a 180 roll manoeuvre, and the actual roll of the spacecraft would transition from 0 to 180 or from 180 to 0 at about the indicated time. The determination of this time will be made by the FOT. Please note that roll manoeuvres are not instantaneous, they last for about 26 minutes. At the end of a roll manoeuvre, the spacecraft is not yet in Normal Mode, i.e. there is no guarantee that the actual spacecraft roll is very close to the nominal roll. - When the spacecraft is not in Normal Mode for an extended time period, the time in the 'nominal_roll_attitude.dat' file will reflect the moment at which it has been decided to change the nominal roll of the spacecraft. Whenever SOHO goes into normal mode again, its actual roll attitude will be as close as possible to this nominal value. - For example, on 8 July 2003 SOHO was in ESR when such a decision was taken. The nominal roll angle of SOHO was up until then 0 (zero) degrees. But the actual roll angle of the spacecraft was about 60 degrees when it was decided to go to a 180 degree nominal roll attitude at about 13:00 UT. When the spacecraft went into normal mode again, the actual roll attitude had been set already to 180 degrees, (it did not go first to 0). In this case, the time recorded in the 'nominal_roll_attitude.info' for the nominal roll change is 13 UT. This does not mean that at 13 UT the roll attitude of SOHO was changed to 180 degrees, but that the next time SOHO went into normal mode after 13 UT, its roll attitude was as close as possible to 180 degrees. There is a SolarSoft routine (called "get_soho_roll") available to read this file and give the correct value for any given date. For finding out the mode of the spacecraft, see the ancillary spacecraft mode files at 'data/ancillary/scmode' in our web pages. http://sohowww.nascom.nasa.gov/data....de.info |
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hitt
28.03.2014 17:56
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Сайт для любителей Галактик,созведий и т.д только фото-каждый день разные.NASA http://apod.nasa.gov/apod/archivepix.html
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hitt
28.03.2014 17:42
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Для участников дискуссии ,моё любимое СОЛНЦЕ.("вращающееся СОЛНЦЕ-период с 1.01.-31.01.14)видео.оч.красиво http://apod.nasa.gov/apod/ap140312.html ,видны ПЯТНА(может от ударов чего -либо на жёлтом диске)Ответьте кто нибудь почему там солнце вращается против "часовой стрелки"?
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Moonya
28.03.2014 17:37
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Deff, и к чему Вы приводите схему коронографа C1, если обсуждаемые снимки и снимок в самой теме относятся к коронографу C3, которые есть части широкоугольного спектрометрического коронографа (LASCO), который является одним из инструментов, находящихся на борту SOHO, который)))))
Соответствующая картинка (support pylon - опора, держатель/occulter - затемняющий диск) RaVest, да, эти непонятные 180 град. перемещения держателя... Особенно 30 сентября 2013 после яркой засветки на снимках C3. |