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The F 2 layer exists from about 220 to 800 km (140 to 500 miles) above the surface of the Earth. The F 2 layer is the principal reflecting layer for HF radio communications during both day and night. The horizon-limited distance for one-hop F 2 propagation is usually around 4,000 km (2,500 miles). The F 2 layer has about 10 6 e/cm 3. However ...
The following year, Education Insights developed other quiz games with a completely new interface independent of the Microsoft Bob framework and compatible on both Windows and Macintosh. Each game is about a specific topic: GeoSafari Animals (October 1995) GeoSafari Geography (1995) GeoSafari History (1995) GeoSafari Science (1995)
GEO drifting Retired: BeiDou-2 - Sent to GEO graveyard Orbit by Shijian-21 space Debris mitigation satellite or orbital servicing vehicle in January 2022. [10] 3 Compass-G1 16 January 2010 16:12 Xichang, LC-2 Long March 3C: N/A GEO 140.0° E Retired: BeiDou-2 4 Compass-G3 2 June 2010 15:53 Xichang, LC-2 Long March 3C: N/A GEO 79.5° E Retired ...
171.3°W TDRS-10 (J), GE 2 (174°W) United States NASA: 5 December 2002, Atlas IIA: 171.1°W TDRS-11: United States NASA: 31 January 2013, Atlas V 401: 169.5°W NSS-6: Lockheed Martin A2100AXS: Netherlands SES: Direct broadcasting, video distribution Asia: 17 December 2002 Ariane 44L: Ku-band satellite 167.6°W TDRS-5: United States NASA: 2 ...
Anik F2 has lost two of its four thrusters. As a result, continued operation uses significantly more fuel. Telesat has announced [23] that it is acquiring an in-orbit satellite to replace Anik F2. An FCC filing by Telesat has since revealed [24] that the company is buying AMC-11 from SES. Once the FCC has issued its permit, Telesat can take ...
Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [4]
Fragments of lava or rock less than 1 ⁄ 3 centimetre (0.13 in) in diameter that have been ejected into the atmosphere by a volcanic explosion. [3] aspect. Also exposure. The direction toward which a slope faces with respect to a compass or to the Sun's position in the sky, [5] or the direction which a segment of coastline faces as it meets ...
The International Geography Olympiad (iGeo) is an annual competition for 16- to 19-year-old geography students from all over the world. Students chosen to represent their countries are some of the best, chosen from thousands of students who participate enthusiastically in their own National Geography Olympiads. iGeo tests the abilities of every ...