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Related Experiment Video

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Measurement of Bioelectric Current with a Vibrating Probe

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Published on: January 4, 2011

Note: atmospheric point discharge current measurements using a temperature-compensated logarithmic current amplifier.

G J Marlton¹, R G Harrison, K A Nicoll

¹Department of Meteorology, University of Reading, United Kingdom. g.j.marlton@pgr.reading.ac.uk

The Review of Scientific Instruments

|July 5, 2013

Summary

This study presents a new instrument for measuring atmospheric corona currents, crucial for understanding the atmospheric electric field. The device demonstrates accurate logarithmic responses across a wide range of conditions.

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Area of Science:

Atmospheric electricity
Geophysics
Environmental monitoring

Background:

Atmospheric corona currents are historically used to infer the atmospheric electric field.
These currents exhibit significant variations in both polarity and magnitude.
Existing measurement techniques may lack precision across diverse environmental conditions.

Purpose of the Study:

To develop and calibrate a novel instrument for measuring atmospheric corona currents.
To assess the instrument's performance across a wide dynamic range and temperature variations.
To validate the instrument's readings against atmospheric electric field measurements.

Main Methods:

Utilized a sharp point sensor coupled with a temperature-compensated, bipolar logarithmic current amplifier.
Conducted calibrations for currents ranging from ±10 fA to ±3 μA across ±20 °C.
Compared instrument-derived corona currents with simultaneous atmospheric electric field measurements during disturbed weather.

Main Results:

The instrument exhibited an excellent logarithmic response over six orders of magnitude (1 pA to 1 μA) in both polarities.
Performance remained consistent across the typical temperature range encountered in the southern UK.
Induced corona currents showed a corresponding sign to bipolar electric fields, with magnitudes around 0.5 μA during disturbed weather.

Conclusions:

The developed instrument provides accurate and reliable measurements of atmospheric corona currents.
This technology can effectively indicate atmospheric electric field variations.
The findings support the use of corona current measurements for environmental monitoring and atmospheric research.