Here are the results for the letter x
- X-Band
- A frequency band of microwave radiation in which radars operate.
- X-Ray Background
- In solar-terrestrial terms, a daily average background X-ray flux in the 1 to 8
angstrom range. It is a midday minimum designed to reduce the
effects of flares.
- X-Ray Burst
- In solar-terrestrial terms, a temporary enhancement of the X-ray emission of the sun. The
time-intensity profile of soft X-ray bursts is similar to that of
the H-alpha profile of an associated flare.
- X-Ray Flare Class
- In solar-terrestrial terms, rank of a flare based on its X-ray energy output. Flares are classified by the order of magnitude of the peak burst intensity (I) measured at the earth in the 1 to 8 angstrom band as follows:
Class
|
Intensity (in Watts/m 2
)
|
B |
I < 10 -6
|
C |
10 -6
<= I < 10 -5
|
M |
10 -5
<= I < 10 -4
|
X |
I >= 10 -4
|
- X-Rays
- Very energetic electromagnetic radiation with wavelengths intermediate between 0.01 and 10 nanometers (0.1-100 Angstroms) or between gamma rays and ultraviolet radiation. Essentially all X-Rays from space are absorbed in the Earth's upper atmosphere.
- XBT
- Expendable Bathythermograph
- XCITED
- Excited
- XCPT
- Expecting
- XPC
- Expect
- XSEC
- Cross Section
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