General Knowledge - World Geography - Discussion

18. 

The ionosphere includes

[A]. mesosphere
[B]. thermosphere
[C]. thermosphere and exosphere
[D]. thermosphere, exosphere and mesosphere

Answer: Option C

Explanation:

No answer description available for this question.

Priya said: (May 13, 2011)  
Is the ionosphere the topmost layer?

Sonam said: (May 20, 2011)  
The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation.

http://en.wikipedia.org/wiki/Ionosphere

Mayank said: (Mar 7, 2012)  
The ionosphere is a shell of electrons and electrically charged atoms and molecules that surrounds the Earth, stretching from a height of about 50 km to more than 1000 km. It owes its existence primarily to ultraviolet radiation from the Sun.

Abhishek Raj said: (Dec 22, 2012)  
Because ionosphere and exosphere are parts of thermosphere.

Reshu Sharma said: (Jan 15, 2013)  
I think option (b) is the correct answer because there is five distinct layers of atmosphere i.e. troposphere, stratosphere, mesosphere, thermosphere and exosphere. So basically ionosphere is the only part of thermosphere because the dynamics of the thermosphere are dominated by atmospheric tides which are driven by the very significant diurnal heating. Atmospheric tides dissipate collision between the neutral gas and the ionospheric plasma.

Cadet said: (Sep 26, 2015)  
I don't think mesosphere includes the answer.

Gracy Kaur Chadha said: (Oct 3, 2015)  
Answer should be thermosphere only.

Asha said: (Oct 20, 2015)  
The ionosphere is a region of the atmosphere that is ionized by solar radiation. It is responsible for auroras. During daytime hours, it stretches from 50 to 1, 000 km and includes the mesosphere, thermosphere, and parts of the exosphere.

However, ionization in the mesosphere largely ceases during the night, so auroras are normally seen only in the thermosphere and lower exosphere.

Gagan said: (Mar 31, 2016)  
Ionosphere and exosphere are part of thermosphere itself. So the question should be reconsidered.

Arup said: (Feb 26, 2017)  
I think option (b) is the correct answer because there is five distinct layers of atmosphere i.e. troposphere, stratosphere, mesosphere, thermosphere and exosphere. So basically ionosphere is the only part of thermosphere because the dynamics of the thermosphere are dominated by atmospheric tides which are driven by the very significant diurnal heating.

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