سیستم ناوبری جهانی
وبلاگی جهت گسترش علم ژئودزی ماهواره ای
سیستم ناوبری جهانی
وبلاگی جهت گسترش علم ژئودزی ماهواره ایشفق قطبی
This ultraviolet image shows an auroral display as seen from space, overlaid on top of a visible image of Earth. The false-color reds indicate the brightest aurora and blue the dimmest. The brightest aurora is found at midnight.
The ethereal green glow of Aurora Australis high over Concordia station on 18 July 2012. It was taken by ESA-sponsored scientist Alexander Kumar and his colleague Erick Bondoux from about 1 km from the station, located in the Antarctic at –75°S latitude.
The French–Italian Concordia station's programme of research includes glaciology, human biology and the atmosphere. ESA uses the base to prepare for future long-duration missions beyond Earth. During the winter, Concordia is under almost total darkness, with an average temperature of –51°C and a record low of –85°C. It is an ideal place to study the effects on small, multicultural teams isolated for long periods in an extreme, hostile environment.
Auroras occur frequently over both the North and South polar regions, but are often difficult to see from populated areas. During periods of increased solar activity, the lights sometimes extend to populated latitudes. This year has seen unusually high solar activity; most recently, on 14 July, Northern Lights could be seen as far south as Duluth, Minnesota, USA.
منبع :esa
اولین تعیین موقعیت با گالیله
12/02/2013 - first Galileo-only position fix received
On March 12th, 2013, between 10 and 11 o' clock, a first positioning test based on the 4 first operational Galileo satellites was conducted by ESA. This first position fix returned an accuracy range of +/- 10 meters, which is considered as very good, considering that only 4 satellites (out of the total constellation of 30) are already deployed.
http://ec.europa.eu/enterprise/policies/satnav/galileo/index_en.htm#h2-1
جمع آوری زباله های فضایی
سلام
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