Solar Dynamics Observatory: Difference between revisions
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==Spacecraft== |
==Spacecraft== |
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SDO is a [[3-axis stabilized spacecraft]] with two solar arrays and two high-gain antennas. It will orbit at 36,000 km in a circular [[geosynchronous orbit]] at 102° W longitude inclined at 28.5°. |
SDO is a [[3-axis stabilized spacecraft]] with two solar arrays and two high-gain antennas. It will orbit at 36,000 km in a circular [[geosynchronous orbit]] at 102° W longitude inclined at 28.5°. |
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My Resume is online now..... |
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==Science instruments== |
==Science instruments== |
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Revision as of 07:32, 13 February 2010
The Solar Dynamics Observatory (SDO) is a NASA mission which will observe the Sun for over five years. Launched on February 11, 2010, the observatory is part of the Living With a Star (LWS) program.[1] The goal of the LWS program is to develop the scientific understanding necessary to effectively address those aspects of the connected Sun–Earth system that directly affect life and society. SDO's goal is to understand the Sun's influence on Earth and near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously. SDO will investigate how the Sun's magnetic field is generated and structured and how this stored magnetic energy is converted and released into the heliosphere and geospace in the form of solar wind, energetic particles, and variations in the solar irradiance.[2]
General
The SDO spacecraft was built and tested at NASA's Goddard Space Flight Center in Greenbelt, Maryland, and launched on February 11, 2010, from Cape Canaveral Air Force Station. The primary mission is scheduled to last five years and three months, with expendables expected to last for ten years. Some consider SDO to be a follow-on mission to the Solar and Heliospheric Observatory (SOHO).[3]
Launch attempts
| Attempt | Planned | Result | Turnaround | Reason | Decision point | Weather go (%) | Notes |
|---|---|---|---|---|---|---|---|
| 1 | 10 Feb 2010, 3:26:00 pm | Scrubbed | — | Weather (high winds) [4] | 10 Feb 2010, 4:26 pm (T-3:59, immediately after T-4:00 hold) | 40%[5] | window 10:26 to 11:26a EST, attempts made at 10:26, 10:56 and 11:26 |
| 2 | 11 Feb 2010, 3:23:00 pm | Success | 0 days, 23 hours, 57 minutes | 60%[5] | Window: 10:23 to 11:23a EST |
Communications
SDO will downlink science data (K-band) from its two onboard high-gain antennas, and engineering data (S-band) from its two onboard omni-directional antennas. The ground station consists of two dedicated (redundant) 18-meter radio antennas in White Sands, New Mexico, constructed specifically for SDO. The combined data rate will be about 130 Mbit/s (150 Mbit/s with overhead, or 300 Mbit/s 2:1 convolutionally encoded). The SDO will generate approximately 1.5 terabytes of data per day.
SDO will periodically use the Universal Space Network antenna at South Point, Hawaii to provide additional tracking resolution.[citation needed] Mission controllers will operate the spacecraft remotely from the Mission Operations Center at NASA's Goddard Space Flight Center.
Launch vehicle
The launch vehicle is an Atlas V rocket. The SDO launched from NASA's Kennedy Space Center. The initial perigee will be about 2500 km, after which SDO will undergo a series of orbit-raising maneuvers until the nominal orbit is reached.
Spacecraft
SDO is a 3-axis stabilized spacecraft with two solar arrays and two high-gain antennas. It will orbit at 36,000 km in a circular geosynchronous orbit at 102° W longitude inclined at 28.5°. My Resume is online now.....
Science instruments
Extreme Ultraviolet Variability Experiment
The Extreme Ultraviolet Variability Experiment (EVE), led from the University of Colorado at Boulder's Laboratory for Atmospheric and Space Physics (LASP) in Boulder, Colorado, will measure the solar EUV irradiance with unprecedented spectral resolution, temporal cadence, accuracy, and precision.[6]
Helioseismic and Magnetic Imager
The Helioseismic and Magnetic Imager (HMI), led from Stanford University in Stanford, California, studies solar variability and characterizes the Sun's interior and the various components of magnetic activity. HMI produces data to determine the interior sources and mechanisms of solar variability and how the physical processes inside the Sun are related to surface magnetic field and activity. It also produces data to enable estimates of the coronal magnetic field for studies of variability in the extended solar atmosphere. HMI observations will enable establishing the relationships between the internal dynamics and magnetic activity in order to understand solar variability and its effects.[7] HMI will take high-resolution measurements of the longitudinal and vector magnetic field over the entire visible disk thus extending the capabilities of the SOHO's MDI instrument.[8]
Atmospheric Imaging Assembly
The Atmospheric Imaging Assembly (AIA), led from the Lockheed Martin Solar and Astrophysics Laboratory (LMSAL), provides full-disk imaging of the Sun in several ultraviolet and extreme ultraviolet (EUV) band passes at high spatial and temporal resolution. The four telescopes that provided the individual light feeds for the instrument were designed and built at the Smithsonian Astrophysical Observatory (SAO).[9]
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SDO 3-D schematic. -
SDO Instruments. -
SDO ready to be placed on Atlas rocket for launch.
See also
References
- ^ Justin Ray. "Mission Status Center: Atlas 5 SDO". Spaceflight Now. Retrieved 2010-02-13.
- ^ Dean Pesnell; Kevin Addison (05 February 2010). "SDO - Solar Dynamics Observatory: About The SDO Mission". NASA. Retrieved 2010-02-13.
{{cite web}}: Check date values in:|date=(help)CS1 maint: multiple names: authors list (link) - ^ "Solar and Heliospheric Observatory Homepag". ESA / NASA. 09 February 2010. Retrieved 2010-02-13.
{{cite web}}: Check date values in:|date=(help) - ^ Dunn, Marcia. "Stiff wind delays NASA launch of solar observatory". AP. Retrieved 10 February 2010.
- ^ a b "AFD-070716-027" (PDF). United States Airforce, 45th Weather Squadron. Retrieved 7 February 2010.
- ^ Laboratory for Atmospheric and Space Physics (12 May 2008). "SDO - EVE-Extreme ultraviolet Variability Experiment". University of Colorado at Boulder. Retrieved 2010-02-13.
- ^ Solar Physics Research Group. "Helioseismic and Magnetic Imager Investigation". Stanford Universtity. Retrieved 2010-02-13.
- ^ Dean Pesnell; Kevin Addison (05 February 2010). "SDO - Solar Dynamics Observatory: SDO Instruments". NASA. Retrieved 2010-02-13.
{{cite web}}: Check date values in:|date=(help)CS1 maint: multiple names: authors list (link) - ^ "AIA – Atmospheric Imaging Assembly". Lockheed Martin. 03 February 2010. Retrieved 2010-02-14.
{{cite web}}: Check date values in:|date=(help)
External links
- SDO mission website
- Solar Dynamics Observatory Mission Profile by NASA's Solar System Exploration
- Fact Sheet
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