| 词条 | Explorer 24 |
| 释义 |
| name = Explorer 24 | image = Explorer 24.jpg | image_alt = 180px | image_caption = Explorer 24. | mission_type = Earth science | operator = NASA | COSPAR_ID = 1964-076A[1] | SATCAT = 931 | mission_duration = 1,426 days[2] | spacecraft_bus = ADE bus | manufacturer = Langley Research Center | dry_mass = | launch_mass = {{convert|8.6|kg|lb|abbr=on}} | power = | launch_date = {{start-date|21 November 1964, 17:09:39}} UTC[3][4] | launch_rocket = Scout X-4[5] | launch_site = Vandenberg SLC-5[5] | last_contact = | decay_date = {{end-date|18 October 1968}}[1] | orbit_epoch = 21 November 1964[1] | orbit_reference = Geocentric | orbit_regime = Low Earth | orbit_periapsis = {{convert|525|km|abbr=on}}[1] | orbit_apoapsis = {{convert|2,498|km|abbr=on}}[1] | orbit_inclination = 81.4°[1] | orbit_semimajor = | orbit_eccentricity = 0.12496[1] | orbit_period = 116.3 minutes[1] | orbit_RAAN = | orbit_arg_periapsis = | orbit_mean_anomaly = | orbit_mean_motion = | orbit_rev_number = | apsis = gee | instruments = Nonsystematic Changes of Air Density Systematic Changes of Air Density | programme = Explorers | previous_mission = Explorer 23 | next_mission = Explorer 25 }} Explorer 24 (also called AD-B and S-56C) wan an U.S. satellite to atmospheric studies. Explorer 24 was launched on 21 November 1964 from Vandenberg Air Force Base, Lompoc, California, with Scout rocket. Explorer 24 was released along with its successor satellite, Explorer 25. MissionExplorer 24 was placed in orbit together with Explorer 25 from a single launch vehicle. Explorer 24 was identical in configuration to the previously launched balloon satellites Explorer 9 and 19. The spacecraft was 3.6 m in diameter, was built of alternating layers of aluminum foil and plastic film, and was covered uniformly with 5.1-cm white dots for thermal control. It was designed to yield atmospheric density near perigee as a function of space and time from sequential observations of the sphere's position in orbit. To facilitate ground tracking, the satellite carried a 136 MHz tracking beacon. The satellite reentered the earth's atmosphere on October 18, 1968.[1] ResultsExplorer 24 helped determine the variation in density between the day and night of the Earth and gave rise to studies on the zone winds in the exosphere, at an altitude of between {{convert|450|km|mi}} and {{convert|620|km|mi}}.[6][7] References1. ^1 2 3 4 5 6 7 8 {{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1964-076A|title=S 55C|work=NSSDC Master Catalog|publisher=NASA Goddard Space Flight Center|accessdate=10 June 2018}} {{PD-notice}} {{Explorers program}}{{Orbital launches in 1964}}{{US-spacecraft-stub}}2. ^{{cite web|title=1964-076A - Explorer 24|url=https://www.lib.cas.cz/space.40/1964/076A.HTM|work=Space 40 |publisher=Lubor Lejček, Antonín Vítek|language=Czech|accessdate=10 June 2018}} 3. ^{{cite web|url=http://www.planet4589.org/space/log/launchlog.txt/|publisher=Jonathan's Space Page|title=Launch Log|accessdate=June 10, 2018}} 4. ^{{cite web|url=http://www.unoosa.org/documents/pdf/inf088E.pdf/|title=Letter dated 5 February 1965 from the Permanent Representative of the United States of America addressed to the Secretary-General|work=COMMITTEE ON THE PEACEFUL USES OF OUTER SPACE|publisher=UNOOSA|date=November 30, 1964|accessdate=10 June 2018}} 5. ^1 {{cite web|title=Explorer|url=http://www.astronautix.com/e/explorer.html/|work=Encyclopedia Astronautica|publisher=Mark Wade|accessdate=10 June 2018}} 6. ^{{cite web|title=The Shape and Location of the Diurnal Bulge in the Upper Atmosphere|url=http://articles.adsabs.harvard.edu/full/1966SAOSR.207.....J/0000001.000.html|work=SAO Special Report (207)|publisher= Jacchia, L. G. & Slowey, J.|date=1966|accessdate=10 June 2018}} 7. ^{{cite web|title=Exospheric zonal winds between 540 and 620 km from the orbit of Explorer 24|url=http://adsabs.harvard.edu/abs/1976P%26SS...24..529B|work=Planetary and Space Science 24: 529–539|publisher=Blum, P. W.; Schuchardt, K. G. H.|date=June 24, 1976|accessdate=June 10, 2018}} 3 : Spacecraft launched in 1964|Explorers program (NASA)|Balloon satellites |
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