MAVEN explained

Mars Atmosphere and Volatile Evolution
Names List:MAVEN
Mission Type:Mars orbiter
Operator:NASA
Cospar Id:2013-063A
Satcat:39378
Mission Duration:2 years (planned)
(elapsed)
Manufacturer:Lockheed Martin
Launch Mass:[1]
Dimensions:2.3 m × 2.3 m × 2 m
Power:1135 watts[2]
Launch Date:18 November 2013, 18:28:00 UTC
Launch Rocket:Atlas V 401
AV-038
Launch Site:Cape Canaveral, SLC-41
Launch Contractor:United Launch Alliance
Orbit Reference:Areocentric
Orbit Inclination:75°
Orbit Period:4.5 hours
Apsis:areon
Interplanetary:
Type:orbiter
Arrival Date:22 September 2014, 02:24 UTC [3]
MSD 50025 08:07 AMT
Insignia:MAVEN Mission Logo.png
Insignia Caption:Maven mission logo
Insignia Size:200px
Programme:Mars Exploration Program
Previous Mission:Curiosity
Next Mission:InSight

MAVEN is a NASA spacecraft orbiting Mars to study the loss of that planet's atmospheric gases to space, providing insight into the history of the planet's climate and water.[4] The name is an acronym for "Mars Atmosphere and Volatile Evolution" while the word maven also denotes "a person who has special knowledge or experience; an expert".[5] [6] MAVEN was launched on an Atlas V rocket from Cape Canaveral Air Force Station, Florida, on 18 November 2013 UTC and went into orbit around Mars on 22 September 2014 UTC. The mission is the first by NASA to study the Mars atmosphere. The probe is analyzing the planet's upper atmosphere and ionosphere to examine how and at what rate the solar wind is stripping away volatile compounds.

The principal investigator for the mission is Shannon Curry at the University of California, Berkeley. She took over from Bruce Jakosky of the Laboratory for Atmospheric and Space Physics at the University of Colorado Boulder, who proposed and led the mission until 2021.[4] The project cost $582.5 million to build, launch, and operate through its two-year prime mission.[7]

Pre-launch

Proposed in 2006, the mission was the second of NASA's Mars Scout Program, which had previously yielded Phoenix. It was selected for development for flight in 2008.[8]

On 2 August 2013, the MAVEN spacecraft arrived at Kennedy Space Center, in Florida to begin launch preparations.[9]

On 1 October 2013, only seven weeks before launch, a government shutdown caused suspension of work for two days and initially threatened to force a 26-month postponement of the mission. With the spacecraft nominally scheduled to launch on 18 November 2013, a delay beyond 7 December 2013 would have caused MAVEN to miss the launch window as Mars moved too far out of alignment with the Earth.[10]

However, two days later, on 3 October 2013, a public announcement was made that NASA had deemed the 2013 MAVEN launch so essential to ensuring future communication with current NASA assets on Mars — the rovers Opportunity and Curiosity — that emergency funding was authorized to restart spacecraft processing in preparation for an on-time launch.[11]

Objectives

Features on Mars that resemble dry riverbeds and the discovery of minerals that form in the presence of water indicate that Mars once had a dense enough atmosphere and was warm enough for liquid water to flow on the surface. However, that thick atmosphere was somehow lost to space. Scientists suspect that over millions of years, Mars lost 99% of its atmosphere as the planet's core cooled and its magnetic field decayed, allowing the solar wind to sweep away most of the water and volatile compounds that the atmosphere once contained.[12]

The goal of MAVEN is to determine the history of the loss of atmospheric gases to space, providing answers about Martian climate evolution. By measuring the rate with which the atmosphere is currently escaping to space and gathering enough information about the relevant processes, scientists will be able to infer how the planet's atmosphere evolved over time. The MAVEN mission's primary scientific objectives are:

Timeline

MAVEN launched from the Cape Canaveral Air Force Station (CCAFS) on 18 November 2013, using an Atlas V 401 launch vehicle.[13] It reached Mars on 22 September 2014, and was inserted into an elliptic orbit approximately by above the planet's surface.[14]

In October 2014, as the spacecraft was being fine-tuned to start its primary science mission, the comet Siding Spring was also performing a close flyby of Mars. The researchers had to maneuver the craft to mitigate harmful effects of the comet, but while doing so, were able to observe the comet and perform measurements on the composition of expelled gases and dust.[15]

On 16 November 2014, investigators completed MAVEN's commissioning activities and began its primary science mission, scheduled to last one year.[16] During that time, MAVEN had observed a nearby comet, measured how volatile gases are swept away by solar wind, and performed four "deep dips" down to the border of the upper and lower atmospheres to better characterize the planet's entire upper atmosphere.[17] In June 2015, the science phase was extended through September 2016, allowing MAVEN to observe the Martian atmosphere through the entirety of the planet's seasons.

On 3 October 2016, MAVEN completed one full Martian year of scientific observations. It had been approved for an additional 2-year extended mission through September 2018. All spacecraft systems were still operating as expected.[18]

In March 2017, MAVEN's investigators had to perform a previously unscheduled maneuver to avoid colliding with Phobos the following week.[19]

On 5 April 2019, the navigation team completed a two-month aerobraking maneuver to lower MAVEN's orbit and enable it to better serve as a communications relay for current landers as well as the rover Perseverance. This new elliptic orbit is approximately by . With 6.6 orbits per Earth day, the lower orbit allows more frequent communication with rovers.[20]

As of September 2020, the spacecraft is continuing its science mission as well, with all instruments still operating and with enough fuel to last at least until 2030.[20]

On August 31, 2021, Shannon Curry became the Principal Investigator of the mission.[21]

NASA became aware of failures in the MAVEN's inertia measurement units (IMU) in late 2021, necessary for the probe to maintain its orbit; having already moved from the main IMU to the backup one in 2017, they saw the backup ones showing signs of failure. In February 2022, both IMUs had appeared to have lost the ability to perform its measurement properly. After doing a heartbeat termination to restore the use of the backup IMU, NASA engineers set to reprogram MAVEN to use an "all stellar" mode using star positions to maintain its altitude, eliminating the reliance on the IMUs. This was put into place in April 2022 and completed by May 28, 2022, but during this period, MAVEN could not be used for scientific observations or to relay communications to Earth from the rovers Curiosity and Perseverance and the Insight lander. Reduced communication was handled by other Mars orbiters.[22]

Spacecraft overview

MAVEN was built and tested by Lockheed Martin Space Systems. Its design is based on those of Mars Reconnaissance Orbiter and 2001 Mars Odyssey. The orbiter has a cubical shape of about high,[23] with two solar arrays that hold the magnetometers on both ends. The total length is .[24]

Relay telecommunications

NASA's Jet Propulsion Laboratory provided an Electra ultra high frequency (UHF) relay radio payload which has a data return rate of up to 2048 kbit/s.[25] The highly elliptical orbit of the MAVEN spacecraft may limit its usefulness as a relay for operating landers on the surface, although the long view periods of MAVEN's orbit have afforded some of the largest relay data returns to date of any Mars orbiter.[26] During the mission's first year of operations at Mars — the primary science phase — MAVEN served as a backup relay orbiter. In the extended mission period of up to ten years, MAVEN will provide UHF relay service for present and future Mars rovers and landers.[27]

Scientific instruments

The University of Colorado Boulder, University of California, Berkeley, and Goddard Space Flight Center each built a suite of instruments for the spacecraft, and they include:[28]

Built by the University of California, Berkeley Space Sciences Laboratory:

Built by the University of Colorado Boulder Laboratory for Atmospheric and Space Physics:

Built by Goddard Space Flight Center:

SWEA, SWIA, STATIC, SEP, LPW, and MAG are part of the Particles and Fields instrument suite, IUVS is the Remote Sensing instrument suite, and NGIMS is its own eponymous suite.

Cost

MAVEN cost US$582.5 million to build, launch, and operate for its prime mission, nearly US$100 million less than originally estimated. Of this total, US$366.8 million was for development, US$187 million for launch services, and US$35 million was for the 2-year prime mission. On average, NASA spends US$20 million annually on MAVEN's extended operations.

Results

Atmospheric loss

Mars loses water into its thin atmosphere by evaporation. There, solar radiation can split the water molecules into their components, hydrogen and oxygen. The hydrogen, as the lightest element, then tends to rise far up to the highest levels of the Martian atmosphere, where several processes can strip it away into space, to be forever lost to the planet. This loss was thought to proceed at a fairly constant rate, but MAVEN's observations of Mars's atmospheric hydrogen through a full Martian year (almost two Earth years) show that the escape rate is highest when Mars's orbit brings it closest to the Sun, and only one-tenth as great when it is at its farthest.[39]

On 5 November 2015, NASA announced that data from MAVEN shows that the deterioration of Mars's atmosphere increases significantly during solar storms. That loss of atmosphere to space likely played a key role in Mars's gradual shift from its carbon dioxide–dominated atmosphere – which had kept Mars relatively warm and allowed the planet to support liquid surface water – to the cold, arid planet seen today. This shift took place between about 4.2 and 3.7 billion years ago.[40] Atmospheric loss was especially notable during an interplanetary coronal mass ejection in March 2015.[41]

Different types of aurora

In 2014, MAVEN researchers detected widespread aurora throughout the planet, even close to the equator. Given the localized magnetic fields on Mars (as opposed to Earth's global magnetic field), aurora appear to form and distribute in different ways on Mars, creating what scientists call diffuse aurora. Researchers determined that the source of the particles causing the aurorae were a huge surge of electrons originating from the Sun. These highly energetic particles were able to penetrate far deeper into Mars's atmosphere than they would have on Earth, creating aurora much closer to the surface of the planet (~60 km as opposed to 100–500 km on Earth).[42]

Scientists also discovered proton aurora, different from the so-called typical aurora which is produced by electrons. Proton aurora were previously only detected on Earth.[43]

Interaction with a comet

The fortuitous arrival of MAVEN just before a flyby of the comet Siding Spring gave researchers a unique opportunity to observe both the comet itself as well as its interactions with the Martian atmosphere. The spacecraft's IUVS instrument detected intense ultraviolet emissions from magnesium and iron ions, a result from the comet's meteor shower, which were much stronger than anything ever detected on Earth.[44] The NGIMS instrument was able to directly sample dust from this Oort Cloud comet, detecting at least eight different types of metal ions.[45]

Detection of metal ions

In 2017, results were published detailing the detection of metal ions in Mars's ionosphere. This is the first time metal ions have been detected in any planet's atmosphere other than Earth's. It was also noted that these ions behave and are distributed differently in the atmosphere of Mars given that the red planet has a much weaker magnetic field than our own.[46]

Impacts on future exploration

In September 2017, NASA reported a temporary doubling of radiation levels on the surface of Mars, as well as an aurora 25 times brighter than any observed earlier. This occurred due to a massive, and unexpected, solar storm.[47] The observation provided insight into how changes in radiation levels might impact the planet's habitability, helping NASA researchers understand how to predict as well as mitigate effects on future human Mars explorers.

External links

Notes and References

  1. Web site: MAVEN . NASA's Solar System Exploration website . December 1, 2022.
  2. http://mars.jpl.nasa.gov/files/resources/MAVENPresentation2013.pdf 'MAVEN' Mission PowerPoint
  3. Web site: Brown. Dwayne. Neal-Jones. Nancy. Zubritsky. Elizabeth. NASA's Newest Mars Mission Spacecraft Enters Orbit around Red Planet. September 21, 2014. NASA. September 22, 2014.
  4. Web site: MAVEN Fact Sheet.
  5. maven2mars . 394917251918618624 . October 28, 2013 . Fittingly, from #Hebrew, via #Yiddish, a "maven" is a trusted expert who understands and seeks to pass knowledge on to others. #MAVEN #Mars . 7 March 2015.
  6. Book: American Heritage Dictionary of the English Language. 2000 . Houghton Mifflin. 0-395-82517-2. 4th. Boston. 1082. A person who has special knowledge or experience; an expert.. 7 March 2015. registration.
  7. Web site: The Planetary Exploration Budget Dataset . planetary.org. The Planetary Society. November 2, 2020.
  8. Jakosky. B. M.. Lin. R. P.. Grebowsky. J. M.. Luhmann. J. G.. Mitchell. D. F.. Beutelschies. G.. Priser. T. . Acuna. M.. Andersson. L.. Baird. D.. Baker. D.. December 2015. The Mars Atmosphere and Volatile Evolution (MAVEN) Mission . Space Science Reviews. 195. 1–4. 3–48. 10.1007/s11214-015-0139-x. 2015SSRv..195....3J. 18698391. 0038-6308.
  9. Web site: NASA Begins Launch Preparations for Next Mars Mission. August 6, 2013. August 5, 2013. NASA.
  10. Web site: A Government Shutdown Could Delay MAVEN's Launch to Mars. Casey . Dreier . September 30, 2013. The Planetary Society. December 11, 2022.
  11. Web site: Jakosky. Bruce. MAVEN reactivation status update. Laboratory of Atmospheric and Space Physics . September 20, 2013. October 4, 2013.
  12. http://www.nasa.gov/mission_pages/maven/news/confirmation.html MAVEN Mission to Investigate How Sun Steals Martian Atmosphere
  13. Web site: MAVEN PressKit .
  14. Web site: MAVEN Science Orbit. 2020-09-18.
  15. Web site: mars.nasa.gov. NASA's MAVEN Studies Passing Comet and Its Effects. 2020-09-18. NASA's Mars Exploration Program.
  16. Web site: mars.nasa.gov. MAVEN Completes Commissioning And Begins Its Primary Science Mission. 2020-09-18. NASA's Mars Exploration Program.
  17. Web site: mars.nasa.gov. NASA's MAVEN Celebrates One Year at Mars. 2020-09-18. NASA's Mars Exploration Program.
  18. Web site: MAVEN Celebrates One Mars Year of Science. 3 October 2016 . 2020-09-25.
  19. Web site: MAVEN Steers Clear of Mars Moon Phobos. 2 March 2017 . 2020-09-25.
  20. Web site: MAVEN Uses Red Planet's Atmosphere to Change Orbit. 5 April 2019 . 2020-09-25.
  21. Web site: Gran. Rani. September 9, 2021. NASA Mars Mission Begins a New Chapter of Science With a New Leader.
  22. Web site: NASA's Mars MAVEN spacecraft spent 3 months on the brink of disaster . Meghan . Bartels . June 1, 2022 . June 2, 2022 . .
  23. http://www.nasa.gov/mission_pages/maven/news/maven-structure.html MAVEN Mission Primary Structure Complete
  24. http://www.nasa.gov/sites/default/files/files/MAVENFactSheet_Final20130610.pdf MAVEN – Facts
  25. Web site: The Electra Proximity Link Payload for Mars Relay Telecommunications and Navigation. January 11, 2013. September 29, 2003 . NASA. dead. https://web.archive.org/web/20130502170707/http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/7832/1/03-2150.pdf. May 2, 2013.
  26. http://www.jpl.nasa.gov/news/news.php?feature=4370 Newest NASA Mars Orbiter Demonstrates Relay Prowess
  27. http://lasp.colorado.edu/home/maven/about/faqs/ MAVEN – FAQ
  28. Web site: MAVEN – Instruments. October 25, 2012. 2012. University of Colorado Boulder.
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  47. Web site: Scott. Jim. Large solar storm sparks global aurora and doubles radiation levels on the martian surface. September 30, 2017. phys.org. September 30, 2017.