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    SDO Lunar Transit, October 16, 2020

    Just two weeks ago the Full Moon and Mars had a bright conjunction in the night sky. Tomorrow the New Moon will glide between SDO and the Sun for a 47 minute lunar transit. Here's the SDO FOT movie...
  2. SDO Plans from October 2020 through February 2021

    The SDO Quarterly LongSet Predicts have been delivered. We have two lunar transits in the next three months. The highlights are listed below:

    16 Oct 2020 @ 1906 to 1953z (10/16 @ 1506 to 1553L)...
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    Calibration Maneuvers Today

    SDO will execute the EVE Field of View (FOV) calibration maneuver starting at 1315 UTC (9:15 am ET). That will be followed by the HMI/AIA Flatfield calibration maneuver starting at 1630 UTC (2:30 pm...
  4. Memories of the 21 August 2017 Total Solar Eclipse

    https://3.bp.blogspot.com/-kE4GgiZrkCM/Xz_OenKKjxI/AAAAAAAABYU/Z5Zd-HwlNLUFc3xWCWTYd25SpBasVD0LACLcBGAsYHQ/s400/DSC_0962.jpg
    Three years ago a total solar eclipse passed over the continental United...
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    Station Keeping Maneuver and Cool Video

    SDO performed a station keeping maneuver (SK #21), Wednesday at 2210 UT (6:10 pm ET). For about 15 minutes beofre and after the maneuver SDO science data may be blurry or missing. Looking for a new...
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    It's EVE Cruciform Maneuver Day!

    SDO is performing the EVE cruciform calibration manuever today, starting at 1130 UTC (7:30 am ET) and running for about 8 hours. During this maneuver science data may be missing or blurry.
    ...
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    Momentum Management Maneuver #38 Today

    SDO will execute momentum management maneuver (MM) #38 today starting at 1930 UTC (3:30 pm ET). The maneuver should take about 30 minutes. During a maneuver SDO science data may be missing or...
  8. SDO Manuevers and Plans for July through September

    SDO will perform the following maneuvers during the next three months. During a maneuver science may be blurry or missing. Other important dates (such as handover and eclipse seasons) are included...
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    Momentum Management Maneuver #37 Today

    SDO will execute Momentum Management Maneuver #37 today at 1838 UTC (2:38 p.m. ET). From 1830 to 1930 (UTC) science data may be missing or blurred.

    More...
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    View Post

    The magnetic field of the Sun has several patterns and follows a few laws. Hale’s Polarity Law is one of those. It says that the leading and trailing magnetic fields in an active region have the...
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    Lunar Transit Last Night!

    Yesterday, from 6:00--8:33 pm, the Moon moved between SDO and the Sun. These lunar transits happen a few times each year. Here is the FOT movie of the event, produced last year. The transit covered a...
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    Station Keeping Maneuver #20 Today

    SDO will execute Station Keeping Maneuver #20 today at 2230 UTC (5:30 p.m. ET). From 2200 to 2250 UTC (5:00-5:50 p.m. ET) science data may be missing or blurred. Station-keeping maneuvers are...
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    Happy Anniversary SDO!

    Ten years ago, 11 Feb 2010, SDO rose majestically into the Florida skies. Since that day we have taken and recorded over 350 million images of the Sun....
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    Calibration Maneuvers Today

    Today from 1315-1915 UTC (8:15 am - 2:15 pm ET) SDO will perform the EVE Field of View and HMI/AIA Flatfield calibration maneuvers. Science data recorded during these maneuvers may be missing,...
  15. Thread: Happy Perihelion!

    by SDO
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    Happy Perihelion!

    On January 5, 2020, at 0547 UTC (2:47 am ET) the Earth reached perihelion in its orbit around the Sun. At that time the Earth was 147,091,144 km (91,381,199 mi) from the Sun. The Earth's will reach...
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    200 Million Image from AIA

    In all the hype about the Mercury transit last Monday, we overlooked another milestone in the SDO mission. On November 5, 2019, the AIA instrument returned its 200 millionth image. Here it is and...
  17. Extraordinary Pictures of the 2019 Mercury Transit

    Here are composite views of Monday's transit (top) and the transit in 2016 (bottom). They were produced by Monica Bobra at Stanford University. What can we learn about Mercury's orbit from these...
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    Mercury Transit this Monday!

    We will see a transit of Mercury across the disk of the Sun on Monday, November 11, 2019. You can watch the transit using SDO data at https://mercurytransit.gsfc.nasa.gov/2019/.

    Here is a movie of...
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    Mercury transit, November 11, 2019

    Starting around 1200 UTC (7:00 am ET) November 11, 2019, we will begin watching Mercury move into view against the corona of the Sun. This is about 45 minutes before it is visible against the Sun...
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    Testing of AIA Today, 1800-1900 UTC

    Today from 1800-1900 UTC (2-3 pm ET), AIA will record some test images. This will exercise the ability to command AIA to produce partial (cropped) and uncompressed images. Other instruments will be...
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