Measurement of the electrical potential gradient in the atmosphere by  radiosonde

Venkiteshwaran, S. P.; Gupta, Barun K. Sen; Huddar, B. B.

doi:10.54302/mausam.v5i3.4874

Cited by 2 publications

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“…, Equation Equation 8 has been the standard expression for calculating air conductivity from voltage decay measurements throughout the history of air ion instrumentation, using τ determined from a time series of voltage data 2,3,12 .…”

Section: Classical Theory Of Air Conductivity Measurement With An Asp...mentioning

confidence: 99%

“…Differences from the exponential decays predicted by Equation 7 appear detectable in measurements of voltage decays in atmospheric air, following a series of measurements made over several months which rarely showed the exponential decays expected based on classical assumptions 9 . Additionally, past voltage decays measured in the free troposphere were also non-exponential 12 . Figure 2 shows exponential fits to typical voltage decay time series in surface atmospheric air.…”

Section: Modification To the Classical Theory Of The Voltage Decay Modementioning

confidence: 99%

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Aspirated capacitor measurements of air conductivity and ion mobility spectra

Aplin

2005

Review of Scientific Instruments

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Measurements of ions in atmospheric air are used to investigate atmospheric electricity and particulate pollution. Commonly studied ion parameters are (1) air conductivity, related to the total ion number concentration, and (2) the ion mobility spectrum, which varies with atmospheric composition. The physical principles of air ion instrumentation are long-established. A recent development is the computerised aspirated capacitor, which measures ions from (a) the current of charged particles at a sensing electrode, and (b) the rate of charge exchange with an electrode at a known initial potential, relaxing to a lower potential. As the voltage decays, only ions of higher and higher mobility are collected by the central electrode and contribute to the further decay of the voltage. This enables extension of the classical theory to calculate ion mobility spectra by inverting voltage decay time series. In indoor air, ion mobility spectra determined from both the novel voltage decay inversion, and an established voltage switching technique, were compared and shown to be of similar shape. Air conductivities calculated by integration were: 5.3 ± 2.5 fSm -1 and 2.7 ± 1.1 fSm -1 respectively, with conductivity determined to be 3 fSm -1 by direct measurement at a constant voltage. Applications of the new Relaxation Potential Inversion Method (RPIM) include air ion mobility spectrum retrieval from historical data, and computation of ion mobility spectra in planetary atmospheres.

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Section: Classical Theory Of Air Conductivity Measurement With An Asp...mentioning

confidence: 99%

Section: Modification To the Classical Theory Of The Voltage Decay Modementioning

confidence: 99%

Aspirated capacitor measurements of air conductivity and ion mobility spectra

Aplin

2005

Review of Scientific Instruments

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Measuring electrical properties of the lower troposphere using enhanced meteorological radiosondes

Harrison

2022

Geosci. Instrum. Method. Data Syst.

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Abstract. In atmospheric science, measurements above the surface have long been obtained by carrying instrument packages, radiosondes, aloft using balloons. Whilst occasionally used for research, most radiosondes – around 1000 are released daily – only generate data for routine weather forecasting. If meteorological radiosondes are modified to carry additional sensors, of either mass-produced commercial heritage or designed for a specific scientific application, a wide range of new measurements becomes possible. A programme to develop add-on devices for standard radiosondes, which retains the core meteorological use, is described here. Combining diverse sensors on a single radiosonde helps interpretation of findings and yields economy of equipment, consumables and effort. A self-configuring system has been developed to allow different sensors to be easily combined, enhancing existing weather balloons and providing an emergency monitoring capability for airborne hazards. This research programme was originally pursued to investigate electrical properties of extensive layer clouds and has expanded to include a wide range of balloon-carried sensors for solar radiation, cloud, turbulence, volcanic ash, radioactivity and space weather. For the cloud charge application, multiple soundings in both hemispheres have established that charging at the boundaries of extensive layer clouds is widespread and likely to be a global phenomenon. This paper summarises the Christiaan Huygens medal lecture given at the 2021 European Geosciences Union meeting.

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Measurement of the electrical potential gradient in the atmosphere by radiosonde

Cited by 2 publications

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Aspirated capacitor measurements of air conductivity and ion mobility spectra

Aspirated capacitor measurements of air conductivity and ion mobility spectra

Measuring electrical properties of the lower troposphere using enhanced meteorological radiosondes

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