Radio limb sounding: A technique for measuring global profiles of free electrons in the ionosphere

Earth & Environmental Sciences

• limb 71%
• ionosphere 71%
• radio 66%
• electron 53%
• measuring 51%
• total electron content 44%
• electron density 41%
• earth observation 39%
• solar activity 39%
• observation satellite 37%
• vertical profile 37%
• tomography 32%
• microwave 32%
• comparison 15%
• experiment 14%

Physics & Astronomy

• sounding 96%
• limbs 89%
• ionospheres 81%
• free electrons 74%
• profiles 41%
• electron density profiles 33%
• solar activity 29%
• microwave frequencies 26%
• transmitters 24%
• receivers 21%
• tomography 20%
• orbits 18%
• electrons 10%
• interactions 10%

Engineering & Materials Science

• Ionosphere 100%
• Electrons 76%
• Satellites 58%
• Micro satellites 54%
• Carrier concentration 53%
• Microwave frequencies 48%
• Tomography 36%
• Orbits 33%
• Earth (planet) 31%
• Transmitters 31%
• Experiments 13%