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IONOSPHERIC PARAMETERS23

The following tables give average nighttime values. Where two numbers are entered, the first refers to the lower and the second to the upper portion of the layer.

Quantity

E Region

F Region

Altitude (km)

90-160

160-500

Number density (m —3)

1.5 X 1010-3.0 X 1010

5 X 1010—2 x 1011

Height-integrated number

9 x 1014

4.5 X 1015

density (m-2)

 

 

Ion-neutral collision

2 x 103-102

0.5-0.05

frequency (sec-1)

 

 

Ion gyro-/collision

0.09-2.0

4.6 x 102-5.0 x 103

frequency ratio k^

 

 

Ion Pederson factor

0.09-0.5

2.2 x 10-3-2 x 10-4

Ki/( 1 + Ki2)

 

 

Ion Hall factor

8 X 10-4-0.8

1.0

K,i2/( 1 + Ki2)

 

 

Electron-neutral collision

1.5 x 104-9.0 x 102

80-10

frequency

 

 

Electron gyro-/collision

4.1 x 102-6.9 x 103

7.8 X 104-6.2 x 105

frequency ratio Ke

 

 

Electron Pedersen factor

2.7 X 10-3-1.5 X 10-4

10-5-1.5 X 10-6

Ke/(1 + Ke2)

 

 

Electron Hall factor

1.0

1.0

KeVC1 + Ke2)

 

 

Mean molecular weight

28-26

22-16

Ion gyrofrequency (sec-1)

180-190

230-300

Neutral diffusion

30-5 X 103

105

coefficient (m2 sec-1)

 

 

The terrestrial magnetic field in the lower ionosphere at equatorial lati­tudes is approximately Bq = 0.35 Xl0-4 tesla. The earth's radius is Re = 6371 km.

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Книги: 1908 А Б В Г Д Е З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Э Ю Я