FR-1 (satellite)

Summary

FR-1
Satellite FR 1 musee du Bourget P1020343.JPG
Cutaway replica of FR-1 at the Musée de l'air et de l'espace
NamesFR-1
FR1[1]
FR 1[1][2][3]:27
FR.1[3]:26–27
FR-1A[4]
FRANCE[5]
FRANCE 1[3]:27[5]
France 1[1]
French 1[1]
Mission typeScientific
OperatorCNES, CNET, NASA
Harvard designation1965-101A
COSPAR ID1965-101A
SATCAT no.1814
Mission duration1,180 days
Spacecraft properties
ManufacturerCNES, CNET, Nord Aviation
Launch mass60 kg (130 lb), 71.7 kg (158 lb), or 135 lb (61 kg)
Start of mission
Launch date6 December 1965, 21:05:47 (1965-12-06UTC21:05:47Z) UTC
RocketScout X-4
Launch siteVandenberg Air Force Base Western Range
End of mission
Last contact28 February 1969 (1969-03-01)
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Semi-major axis7,049 kilometres (4,380 mi)[2]
Perigee altitude696 kilometres (432 mi)
Apogee altitude707 kilometres (439 mi)
Inclination75.9 degrees[2]
Period98.2 minutes[2]
Epoch6 December 1965
 

FR-1[1][4][6] was the second French satellite. Planned as the first French satellite, it was launched on 6 December 1965—ten days after the actual first French satellite, Astérix—by an American Scout X-4 rocket from the Western Range at Vandenberg Air Force Base. The scientific satellite studied the composition and structure of the ionosphere, plasmasphere, and magnetosphere by measuring the propagation of very low frequency (VLF) waves and the electron density of plasma in those portions of the Earth's atmosphere. FR-1's VLF receiver operated until 26 August 1968. FR-1 remains in orbit as of November 2020.

Background

FR-1 was the first step of an ambitious French plan to launch six FR-series satellites, each meant to study a different aspect of the Earth's atmosphere.[3]:26–28 FR-1 was generally designed to study the Earth's magnetic and electric fields in the ionosphere and magnetosphere.[3]:27–28 The satellite Astérix—ultimately France's first satellite, launched ten days before FR-1—was initially conceptualized as the second FR satellite under the name FR-2.[3]:26–28 Like FR-1, FR-2 would study the ionosphere.[3]:28 FR-3 was to be a "scaled-up" version of FR-2, with FR-4 to carry instruments measuring hydrogen distribution in the upper atmosphere, FR-5 to study "magnetic impulses" and serve as a platform for future research, and FR-6 to be a solar-stabilized spacecraft with final payload to be determined based on experimental results from its antecedents.[3]:28–29

The French space agencies Centre national d'études spatiales (CNES) and Centre national d'études des télécommunications (CNET) were developing FR-1 concurrent with Astérix as early as 1963.[3]:26–28 That year, a model of FR-1 was displayed at the 25th Paris Air Show.[3]:27 Payload tests launched from NASA's Wallops Flight Facility (WFF) were planned for autumn 1963.[3]:28 Initial plans called for a late 1964 or early 1965 launch of FR-1 at the Pacific Missile Range, today's Western Range, with Astérix's launch scheduled for early 1965.[3]:26–27 Astérix was orbited prior to FR-1 because Charles de Gaulle and CNES wanted France to become the third space power by launching an independently-developed satellite on a French launcher, a propaganda coup for French exceptionalism during the Cold War.[3]:26–27[7][8]

Spacecraft design

FR-1 mounted on a Scout rocket prior to launch in 1965; from left to right, C. Fayard, X. Namy, J. P. Causse, and L. R. O. Storey

FR-1 was a joint American-French project. CNES and CNET collaborated with the Goddard Space Flight Center (GSFC) on and received funding from NASA's Office of Space Science and Applications for the satellite's design, development, and construction.[4] Xavier Namy of CNES and Samuel R. Stevens of GSFC served as project managers.[1] Dr. Llewelyn Robert Owen Storey of CNET (later NASA) was the primary designer of the satellite's scientific instruments, working in concert with Dr. Robert W. Rochelle of GSFC.[1] French scientists C. Fayard of CNET and Jean-Pierre Causse also worked on the project.[9] French aerospace contractor Nord Aviation helped build the satellite.[3]:26

The design, construction, and launch of FR-1 and Astérix went relatively quickly thanks to three related factors: postwar knowledge gained from Nazi scientists and their work on the V-2 rocket, France's independent development of nuclear IRBM launchers including the Saphir and Diamant rockets, and France's collaborative civilian research with the United States (through NASA) and other European countries (through CERN and ESRO).[10][11]

FR-1 consists of two truncated octagonal pyramids, joined at their bases by an octagonal prism measuring 68.6 centimetres (27.0 in) across from corner to corner and about 71.2 centimetres (28.0 in) high.[1] Solar cells cover the satellite's exterior.[1] A probe for measuring local electron density[12] extends 48.3 centimetres (19.0 in) downward from the base of this octagonal structure.[1] A 71.2-centimetre (28.0 in) high magnetic field antenna and its supporting tube extend upward from the top of the structure.[1] Four telemetry antennas extend diagonally upward and out from the base of this supporting tube.[1] Four 198-centimetre (78 in) long electric field antenna booms extend outward from the base of the octagonal prism.[1] During its operational lifespan, the spacecraft was spin-stabilized, with altitude and spin determination made from sun sensor and three-axis fluxgate magnetometer observations.[1][12] Depending on the source, the satellite's launch mass is cited as 60 kilograms (130 lb),[5] 71.7 kilograms (158 lb),[1] or 135 pounds (61 kg).[4][13]:24

The mission objective was to study the composition and structure of the ionosphere, plasmasphere, and magnetosphere by measuring the propagation of very low frequency (VLF) waves and the local electron density of plasma in those atmospheric layers.[4][12][14] For the VLF wave experiments, stations located on land in Seine-Port, France (at the Émmetteur de Saint-Assise [fr]), and Balboa, Panama, transmitted signals at 16.8 kHz and 24 kHz, respectively, while the satellite's magnetic and electric sensors orbiting about 750 kilometres (470 mi) away analyzed the magnetic field of the received wave.[14][15]

Mission and results

NASA launched two suborbital FR-1 payload tests on 17 October and 31 October 1963, followed by two more pre-mission test flights on 17 September and 25 September 1965, all at Wallops Flight Facility and using Aerobee 150A rockets.[16] In October 1965 Ling-Temco-Vought (LTV; manufacturer of the Scout rocket) and a team of French scientists confirmed the satellite and rocket interfaced properly at LTV's Dallas facility.[13]:24 [17]:33

FR-1 was launched on 6 December 1965 at either 20:07[18] or 21:05:47 UTC[5][6]—ten days after the first French satellite, Astérix—by an American Scout X-4 four-stage rocket[4][6] from Vandenberg Space Launch Complex 5[5] of the Western Range at Vandenberg Air Force Base in Lompoc, California, United States.[2][4]

Principal researchers who studied both the VLF and electron density data included Dr. M. P. Aubry of CNET, Dr. C. Renard, and Dr. Storey.[14] Aubry published his results in 1968, while Storey published initial findings in 1967 before the mission's ultimate end.[14][15] Northern Irish physicist James Sayers—an electron density expert—was also involved in the electron density experiments.[19]

Data collected by FR-1 helped prove the existence of the plasmasphere, a thin layer between the ionosphere and magnetosphere. Prior to their work on FR-1 both Aubry and Storey had studied whistlers, VLF radio waves caused by lightning strikes, as they relate to the plasmasphere.[20] From earlier whistler research Storey had deduced but was unable to conclusively prove the existence of the plasmasphere.[20] In 1963 American scientist Don Carpenter and Soviet astronomer Konstantin Gringauz experimentally proved the plasmasphere and plasmapause's existence, building on Storey's thinking.[21] Aubry and Storey's post-1965 studies of FR-1 VLF and electron density data further corroborated this: VLF waves in the ionosphere occasionally passed through a thin layer of plasma into the magnetosphere, normal to the direction of Earth's magnetic field.[15]:1181[22] Throughout the 1970s, Storey continued studying VLF waves using data gathered by FR-1.[20]

Legacy and status

CNES scientists had posited vestigial radiation from American exoatmospheric nuclear testing would destroy FR-1's solar cells and sever communications three to four months after launch,[3]:28 with orbit lasting a few years.[13]:24 In fact, FR-1's VLF receiver operated until 26 August 1968, ending data collection and therefore the spacecraft's usefulness, but far exceeding the planned three-to-four-month research period.[14][22] All telemetry with the satellite was lost on 28 February 1969. FR-1 remains in orbit as of November 2020.[2]

The Musée de l'air et de l'espace in Paris Le Bourget displays a cutaway replica of the satellite.

See also

References

  1. ^ a b c d e f g h i j k l m n o "General information about FR-1". NASA Space Science Data Coordinated Archive. Retrieved 30 November 2020.
  2. ^ a b c d e f "FR 1 Satellite details 1965-101A NORAD 1814". N2yo.com. Retrieved 30 November 2020.
  3. ^ a b c d e f g h i j k l m n o "French Government Plans West Europe's Most Extensive Space Effort". Aviation Week & Space Technology. New York: McGraw Hill Publishing Company. 17 June 1963. Retrieved 25 November 2020.
  4. ^ a b c d e f g "Aeronautics and Astronautics, 1965" (PDF). NASA. p. 540. Retrieved 30 November 2020.
  5. ^ a b c d e Wade, Mark. "FRANCE satellite". Astronautix. Retrieved 30 November 2020.
  6. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Report. Retrieved 30 November 2020.
  7. ^ Matignon, Louis de Gouyon (28 February 2019). "When France Became the Third Space Power". Space Legal Issues. Retrieved 1 December 2020.
  8. ^ Wilson, Steve (26 November 2012). "Asterix". Space Archaeology. Retrieved 1 December 2020.
  9. ^ Causse, Jean-Pierre. "Le programme FR1". Nons Premières Années (in French). Retrieved 11 December 2020.
  10. ^ Grevsmühl, Sebastian (2019). "Astérix Among the Stars". In Boucheron, Patrick; Gerson, Stéphane (eds.). France in the World: A New Global History. New York: Other Press. pp. 813–817. ISBN 978-159051-941-7.
  11. ^ Siddiqi, Asif A. (April 2010). "Competing Technologies, National(ist) Narratives, and Universal Claims: Toward a Global History of Space Exploration". Technology and Culture. Johns Hopkins University Press. 51 (2): 425–443. doi:10.1353/tech.0.0459. ISSN 1097-3729.
  12. ^ a b c Ducrocq, Albert (25 March 1963). "La course aux deux infinis". Air & Cosmos (in French). 1: 10. ISSN 1240-3113.
  13. ^ a b c "Scout-FR-1 Interface Tested Successfully". Aviation Week & Space Technology. New York: McGraw Hill Publishing Company. 4 October 1965. Retrieved 25 November 2020.
  14. ^ a b c d e "FR 1:VLF Receiver". NASA Space Science Data Coordinated Archive. Retrieved 30 November 2020.
  15. ^ a b c Aubry, M. P. (1968). "Some results of the FR-1 satellite experiment on the VLF wave field in the zone close to the transmitter". Journal of Atmospheric and Terrestrial Physics. 30 (6): 1161–1182. doi:10.1016/S0021-9169(68)80005-4.
  16. ^ Krebs, Gunther. "Aerobee with booster". Gunther's Space Page. Retrieved 30 November 2020.
  17. ^ "FR-1 Configuration Shown During Test". Aviation Week & Space Technology. New York: McGraw Hill Publishing Company. 11 October 1965. Retrieved 25 November 2020.
  18. ^ "Launch/Orbital information for FR 1". NASA Space Science Data Coordinated Archive. Retrieved 30 November 2020.
  19. ^ "FR 1:Electron Density". NASA Space Science Data Coordinated Archive. Retrieved 30 November 2020.
  20. ^ a b c "Owen Storey". Engineering and Technology History Wiki. 29 January 2019. Retrieved 1 December 2020.
  21. ^ Gallagher, D. L. (27 May 2015). "Discovering the Plasmasphere". Space Plasma Physics. Huntsville, AL: NASA Marshall Space Flight Center. Retrieved 1 December 2020.
  22. ^ a b Storey, Llewelyn Robert Owen (1967). "Preliminary results on VLF propagation in the lower magnetosphere obtained by the FR 1 satellite". Space Research. Amsterdam: North Holland Publishing Co. (7): 588–603.

External links

  • Primary documents and photographs related to FR-1's development (in French)