Interpretation of Double Langmuir Probe I-V Characteristics at Different Ionospheric Plasma Temperatures

Abstract

Abstract:Where the plasma potential is fluctuating significantly, Single Langmuir probe method is not relevant to determine the plasma characteristics. This weakness was overcome by the development of the floating double probe. A distortion of the probe characteristics due to varying potential is eliminated, while the whole probe system is floating. This supports probe operation also in discharges with strongly varying potential. Double Langmuir probes provide valuable information on the behavior of space plasmas including ionospheres and the interstellar medium. This research paper focuses on the study of Spherical Double Langmuir Probe I-V characteristics in Maxwellian interstellar plasma. To generate the exact plasma conditions of the experimental testing environments computational procedures is adopted. The investigations address the development of a technique to model Maxwellian plasma. Three different ionospheric plasma temperatures are theoretically taken and its effects on floating potential are studied in this research. The variation of floating potential and ion saturation current due to temperature is clearly depicted. A noticeable trail in the I-V curves is the bump that occurs right after the floating potential. This feature in the transition region affects ability to determine the electron temperature, ion saturation current and plasma potential. Symmetric characteristic when both tips are of equal geometry is an important advantage of the double probe. Generally, all surfaces adjacent to the plasma become contaminated with deposits, so also does any probe. Here I have also deliver some sense of how one might proceed to use these results in the analysis of experimental I-V curves acquired in space.

Measurement of Low-Pressure Plasma Parameters by the Floating Double Probe Method for Dry Air and Helium Gas in a Capillary Glow Discharge

“…Figure (5) gives us the relationship between electron temperature and pressure change. Figure (3) and figure (4) give the current and voltage characteristics in the case of the double probe, the electron temperature can be obtained from the slope of the curves so that the value of the electron temperature is directly obtained [20,21]. Figure (5) shows that there is a decrease in the Electron temperature with a variation of pressure towards its increase, the result agrees with [28,32].…”

“…The production process here overcomes the process of the recombination process. The relationship of saturation current and electron density with pressure which shown in figure (6) and figure (7) takes its somewhat systematic form, also reveals that ion saturation current is calculated from the current and voltage curve of the dual probe for each pressure value [20,27]. The saturation ionic current and electron temperature are considered important indicators of the change in the electron density in the plasma.…”

“…According to the double probe theory, two electrodes are aligned and arranged so that they form a system with diagnostic technology that eliminates the need for reference [3,20]. This technique has a distinct characteristic over the use of a single probe in which the least disturbances are created [2], through this system, the calculations of the electron temperature, ion saturation current through the ideal curve of the characteristics curve of the double probe for each of the dry air and helium gas as a working gas at same plasma conditions as a function of gas pressure as in figure (3) and figure (4) respectively.…”

“…[2,3]. One of these techniques is the use of the Langmuir double probe [19][20][21][22][23][24], as well as the use of the spectrum emitted from the plasma by using it to calculate the parameters of the plasma [25]. Salman et al [26] changed the distance between the double probe and studied the effect of this change on the I-V characteristic curve Ghasemi et al [27] found the electron temperature and electron density practically and in a simulated manner using the Langmuir double probe and they calculated the frequency of the argon plasma which was the highest and the electron temperature in the hydrogen plasma was the highest.…”

Coordinated Observations of Rocket Exhaust Depletion: GOLD, Madrigal TEC, and Multiple Low‐Earth‐Orbit Satellites

“…On the contrary, during nighttime when the solar heating disappears, this competition mechanism does not work. The floating potential of the LP, which is largely determined by the electron temperature (e.g., Chen, 2003, Equation 5; Bhattarai, 2017, Equation 8), also shows little RED‐related change. According to Swarm ion temperature data that have lately been released (Lomidze et al., 2021), ion temperature also exhibits inconspicuous changes at the RED (figure not shown).…”