[Ionosphere] Need to understand collision frequency in E layer

In summary, the E layer is a region of the ionosphere that is ionized by solar radiation and located at an altitude of 90-150 km. Collision frequency in this layer is measured using incoherent scatter radar and can be affected by factors such as ion and electron density, Earth's magnetic field, and temperature. Understanding collision frequency is important for predicting and mitigating atmospheric and space phenomena. It varies throughout the day and is highest during the daytime due to increased solar radiation and lower temperatures.
  • #1
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Hi all,

I am trying to understand about collision frequency that happened in ionosphere layer. In D region, below 90 km [Wait and Spies 1964] the ionospheric electron-neutral collision frequency given as

v(h) = 1.816x10e11 exp(-0.15h)

I just wondering, to who ever really expert in this area, is it for E-region (the area between 90-120km altitude), the same equation can be used to measure collision frequency? as I know, the collision rate is different for different height.

thank you in advance.
 
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  • #2


Hello,

Thank you for your question. As a scientist who specializes in ionospheric research, I can provide some insights on this topic.

Firstly, the equation you mentioned for the D-region is a commonly used empirical formula for estimating the electron-neutral collision frequency in that region. However, it is important to note that this formula is based on measurements and may not accurately represent the actual collision frequency at all locations and times in the D-region.

In general, the collision frequency in the ionosphere is affected by various factors such as temperature, density, and composition of the neutral gas, as well as the presence of charged particles. Therefore, the collision frequency in the E-region may not necessarily follow the same trend as the D-region.

To accurately measure the collision frequency in the E-region, different methods such as incoherent scatter radar or ionosondes are typically used. These methods can provide more precise and location-specific measurements of the collision frequency.

In summary, while the equation you mentioned may provide a rough estimate of the collision frequency in the E-region, it is not recommended to use it as a substitute for actual measurements. It is always best to use specific and reliable methods to measure the collision frequency at different altitudes in the ionosphere.

I hope this helps to clarify your doubts. Please let me know if you have any further questions.
 

1. What is the E layer of the ionosphere?

The E layer is a region of the ionosphere, which is a layer of the Earth's atmosphere that is ionized by solar radiation. The E layer is located at an altitude of approximately 90-150 km above the Earth's surface.

2. How is collision frequency measured in the E layer?

Collision frequency in the E layer is typically measured using a technique called incoherent scatter radar. This involves sending radio waves into the ionosphere and analyzing the scattered signals to determine the collision frequency of ions and electrons in the E layer.

3. What factors affect collision frequency in the E layer?

The collision frequency in the E layer is affected by several factors, including the density of ions and electrons, the strength of the Earth's magnetic field, and the temperature of the ionosphere. Solar activity and fluctuations in the Earth's upper atmosphere can also impact collision frequency.

4. Why is understanding collision frequency in the E layer important?

The collision frequency in the E layer plays a crucial role in various atmospheric and space phenomena, such as the formation of auroras, ionospheric disturbances, and radio wave propagation. Understanding this frequency can help us better predict and mitigate the effects of these phenomena.

5. How does the collision frequency in the E layer vary throughout the day?

The collision frequency in the E layer is not constant and can vary throughout the day. It is generally highest during the daytime due to increased solar radiation and lower temperatures, and decreases at night due to decreased solar radiation and higher temperatures. However, it can also be affected by other factors, such as geomagnetic storms and solar flares.

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