Solar Dynamics Observatory
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| Operator | NASA / Goddard Space Flight Center |
|---|---|
| Mission type | Orbiter |
| Satellite of | Earth |
| Launch date | 2010-02-11 15:23:00 UTC |
| Carrier rocket | Atlas V 401 |
| Launch site | Space Launch Complex 41 Cape Canaveral Air Force Station |
| Mission duration | 5 - 10 years elapsed: 2 years, 1 month and 25 days |
| COSPAR ID | 2010-005A |
| Homepage | http://sdo.gsfc.nasa.gov |
| Mass | payload: 290 kg (640 lb) fuel: 1,400 kg (3,100 lb) total: 3,100 kg (6,800 lb) |
| Orbital elements | |
| Regime | Geosynchronous orbit |
| Inclination | 28° |
| Longitude | 102° W |
| Instruments | |
| Spectral band | <.1 nm |
| Data rate | 130 Mbps on the 26 GHz Ka band 150 million bits/second |
| References: [1][2] | |
The Solar Dynamics Observatory (SDO) is a NASA mission which will observe the Sun for over five years.[3] Launched on February 11, 2010, the observatory is part of the Living With a Star (LWS) program.[4] 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, 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.[5]
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[edit] General
The SDO spacecraft was assembled 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.[6] Some consider SDO to be a follow-on mission to the Solar and Heliospheric Observatory (SOHO).[7]
SDO is a 3-axis stabilized spacecraft, with two solar arrays, and two high-gain antennas. The spacecraft includes three instruments: the Extreme Ultraviolet Variability Experiment (EVE) built in partnership with the University of Colorado at Boulder's Laboratory for Atmospheric and Space Physics (LASP), the Helioseismic and Magnetic Imager (HMI) built in partnership with Stanford University, and the Atmospheric Imaging Assembly (AIA) built in partnership with the Lockheed Martin Solar & Astrophysics Laboratory. Data which is collected by the craft will be made available as soon as possible, after it is received.[8]
[edit] Helioseismic and Magnetic Imager (HMI)
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.[9] 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.[10]
[edit] Extreme Ultraviolet Variability Experiment (EVE)
The Extreme Ultraviolet Variability Experiment (EVE), will measure the Sun's extreme ultraviolet irradiance with improved spectral resolution, "temporal cadence", accuracy, and precision over preceding measurements made by TIMED SEE, SOHO, and SORCE XPS. The instrument incorporates physics-based models in order to further scientific understanding of the relationship between solar EUV variations and magnetic variation changes in the Sun.[11]
The Sun's output of energetic extreme ultraviolet photons is primarily what heats the Earth's upper atmosphere and creates the ionosphere. Solar EUV radiation output undergoes constant changes, both moment to moment and over the Sun's 11-year solar cycle, and these changes are important to understand because they have a significant impact on atmospheric heating, satellite drag, and communications system degradation, including disruption of the Global Positioning System.[12]
The EVE instrument package was built by the University of Colorado at Boulder's Laboratory for Atmospheric and Space Physics, with Dr. Tom Woods as Principal Investigator,[6] and was delivered to Goddard Space Flight Center on September 7, 2007.[13] The instrument provides improvements of up to 70 percent in spectral resolution measurements in the wavelengths below 30 nm, and a 30 percent improvement in "time cadence" by taking measurements every 10 seconds over a 100 percent duty cycle.[12]
[edit] Atmospheric Imaging Assembly (AIA)
The Atmospheric Imaging Assembly (AIA), led from the Lockheed Martin Solar and Astrophysics Laboratory (LMSAL), provides full-disk imaging of the Sun in ten white light, 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).[14] Unfortunately, after launch it was discovered that there is a speck of dust on the CCD.
| AIA Wavelength Channel | Region of solar atmosphere | Characteristic Temperature |
|---|---|---|
| White Light | Photosphere | 5000 K |
| 170 nm | Temperature minimum, photosphere | 5000 K |
| 160 nm | Transition region & photosphere | 105 & 5000 K |
| 30.4 nm | Chromosphere & transition region | 50,000 K |
| 17.1 nm | Quiet corona, upper transition region | 6.3×105 K |
| 19.3 nm | Corona & hot flare plasma | 1.2×106 & 2x107 K |
| 21.1 nm | Active region corona | 2×106 K |
| 33.5 nm | Active region corona | 2.5×106 K |
| 9.4 nm | Flaring regions | 6.3×106 K |
| 13.1 nm | Flaring regions | 4×105, 107 & 1.6×107 K |
[edit] Communications
SDO down-links science data (K-band) from its two onboard high-gain antennas, and telemetry (S-band) from its two onboard omnidirectional antennas. The ground station consists of two dedicated (redundant) 18-meter radio antennas in White Sands Missile Range, New Mexico, constructed specifically for SDO. Mission controllers operate the spacecraft remotely from the Mission Operations Center at NASA's Goddard Space Flight Center. The combined data rate is about 130 Mbit/s (150 Mbit/s with overhead, or 300 Msymbols/s with rate 1/2 convolutional encoding), and the craft generates approximately 1.5 terabytes of data per day, beaming back 150 million bits of data every second (equivalent to about 380 full length movies).[6]
[edit] Launch
| Attempt | Planned | Result | Turnaround | Reason | Decision point | Weather go % | Notes |
|---|---|---|---|---|---|---|---|
| 1 | 10 Feb 2010, 3:26:00 pm | Scrubbed | --- | Weather (high winds) [15] | 10 Feb 2010, 4:26 pm(T-3:59, immediately after T-4:00 hold) | 40%[16] | 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%[16] | Window: 10:23 to 11:23a EST |
NASA's Launch Services Program at Kennedy Space Center managed the payload integration and launch.[17] The SDO launched from Cape Canaveral Air Force Station Space Launch Complex 41, utilizing an Atlas V-401 rocket with a RD-180 powered Common Core Booster, which has been developed to meet the Evolved Expendable Launch Vehicle (EELV) program requirements.[18] On launch the SDO carried a suite of three scientific instruments.[3]
[edit] Orbit
After launch, the spacecraft was placed into an orbit around the Earth with an initial perigee of about 2,500 kilometres (1,600 mi). SDO then underwent a series of orbit-raising maneuvers which adjusted its orbit until the spacecraft reached its planned circular, geosynchronous orbit at an altitude of 36,000 kilometres (22,000 mi), at 102° W longitude, inclined at 28.5°.[19]
[edit] Camilla
Camilla Corona is a rubber chicken (similar to a children's toy), and is the mission mascot for NASA's Solar Dynamics Observatory (SDO). She is part of the Education and public outreach team and assists with various functions to help educate the public, mainly children, about the SDO mission, facts about the sun and space weather. Camilla also assists in cross-informing about other NASA missions and space related projects. Camilla Corona SDO uses social media to interact with fans.
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[edit] See also
[edit] References
- ^ Dean Pesnell; Kevin Addison (5 February 2010). "SDO - Solar Dynamics Observatory: SDO Specifications". NASA. http://sdo.gsfc.nasa.gov/mission/project/specs.php. Retrieved 2010-02-13.
- ^ "SDO Our Eye on the Sun" (.PDF). NASA. http://sdo.gsfc.nasa.gov/assets/docs/SDO_Guide.pdf. Retrieved 2010-02-13.
- ^ a b Bourkland, Kristin L.; Liu, Kuo-Chia. "Verification of the Solar Dynamics Observatory High Gain Antenna Pointing Algorithm Using Flight Data". American Institute of Aeronautics and Astronautics. NASA Technical Reports Server. http://hdl.handle.net/2060/20110015278. Retrieved 14 September 2011.
- ^ Justin Ray. "Mission Status Center: Atlas 5 SDO". Spaceflight Now. http://spaceflightnow.com/atlas/av021/status.html. Retrieved 2010-02-13.
- ^ Dean Pesnell; Kevin Addison (5 February 2010). "SDO - Solar Dynamics Observatory: About The SDO Mission". NASA. http://sdo.gsfc.nasa.gov/mission/about.php. Retrieved 2010-02-13.
- ^ a b c "Solar Dynamics Observatory — Our Eye on the Sky" (.PDF). NASA. http://www.nasa.gov/pdf/417176main_SDO_Guide_CMR.pdf. Retrieved February 13, 2010.
- ^ "Solar and Heliospheric Observatory Homepage". ESA / NASA. February 9, 2010. http://sohowww.nascom.nasa.gov. Retrieved February 13, 2010.
- ^ "Solar Dynamics Observatory — Exploring the Sun in High Definition" (PDF). NASA. http://sdo.gsfc.nasa.gov/assets/docs/sdo_factsheet.pdf. Retrieved February 13, 2010.
- ^ Solar Physics Research Group. "Helioseismic and Magnetic Imager Investigation". Stanford Universtity. http://hmi.stanford.edu/Description/HMI_Overview.html. Retrieved 2010-02-13.
- ^ Dean Pesnell; Kevin Addison (5 February 2010). "SDO - Solar Dynamics Observatory: SDO Instruments". NASA. http://sdo.gsfc.nasa.gov/mission/instruments.php. Retrieved 2010-02-13.
- ^ "SDO - EVE-Extreme ultraviolet Variability Experiment". University of Colorado at Boulder Laboratory for Atmospheric and Space Physics. May 12, 2008. http://lasp.colorado.edu/eve/. Retrieved February 13, 2010.
- ^ a b Woods, Tom. "Extreme Ultraviolet Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO)" (.PDF). University of Colorado at Boulder Laboratory for Atmospheric and Space Physics. http://lasp.colorado.edu/eve/news/eve_news_improvements.pdf. Retrieved 22 September 2011.
- ^ Rani Gran (7 September 2009). "First Solar Dynamic Observatory (SDO) Instrument Arrives at NASA Goddard Space Flight Center". Goddard Space Flight Center. http://www.nasa.gov/centers/goddard/news/topstory/2007/sdo_inst_arrival.html. Retrieved 2010-02-17.
- ^ "AIA – Atmospheric Imaging Assembly". Lockheed Martin. 3 February 2010. http://aia.lmsal.com/. Retrieved 2010-02-14.
- ^ Dunn, Marcia. "Stiff wind delays NASA launch of solar observatory". The Associated Press. http://www.google.com/hostednews/ap/article/ALeqM5gTdD8jyilRavU5Xf6XtGDUAvlUfgD9DPE5L00. Retrieved 10 February 2010.
- ^ a b "AFD-070716-027". United States Airforce, 45th Weather Squadron. http://www.patrick.af.mil/shared/media/document/AFD-070716-027.pdf. Retrieved 7 February 2010.
- ^ "A New Eye on the Sun" (Press release). NASA. http://solarsystem.jpl.nasa.gov/news/display.cfm?News_ID=33515. Retrieved February 13, 2010.
- ^ "SDO Launch Services Program" (PDF). http://www.nasa.gov/pdf/412582main_SDO-508.pdf. Retrieved February 13, 2010.
- ^ Wilson, Jim (February 11, 2010). "NASA — Solar Dynamics Observatory". http://www.nasa.gov/mission_pages/sdo/main/index.html. Retrieved February 13, 2010.
[edit] External links
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Wikimedia Commons has media related to: Solar Dynamics Observatory |
- Solar Dynamics Observatory (SDO) mission website
- Where is the Solar Dynamics Observatory (SDO) right now?
- SDO Outreach Material, HELAS
- Inbound SOHO comet disintegrates as seen in SDO AIA images (Cometal July 14, 2011)
- History of SDO patch, Facebook
[edit] Instruments
- Extreme Ultraviolet Variability Experiment (EVE), University of Colorado
- ATMOSPHERIC IMAGING ASSEMBLY (AIA), Lockheed Martin
- Helioseismic and Magnetic Imager (HMI), Stanford
- Joint Science Operations Center - Science Data Processing HMI - AIA
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