Analysis of Electric Field-Electric Current Characteristics in Positive Column of Ne-Ar Gas Mixed Glow Discharges

AbstractVoltage-current (V-I) characteristics of nitrogen glow discharges at 10 torr gas pressure were obtained in a wide discharge current range from 10 mA to 250 A using parallel-plane electrodes. A low inductance capacitor of 1.89 μF and a discharge apparatus with co-axial configuration were used to produce a nitrogen glow discharge with high current. The time-dependent glow voltage was obtained accurately by solving the circuit equation using the measured values of the current and breakdown voltage. Damping resistor was employed to control the glow discharge current and was altered from 0.6 to 225 Ω in order to obtain the V-I characteristics in a wide current range. The glow discharge voltage was almost constant until the whole surface of the cathode was covered with glow, i.e., until the discharge current became 3.0 A under our experimental condition. The voltage, however, increased with the current when the glow covered over the cathode. Electron density and temperature in a positive column of the glow discharge at 250 A discharge current were obtained to 7.4×10

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Axial Electric Field of He–Ne and He–Ar Gas Mixture Positive Column Plasmas in a Capillary Discharge Tube

Japanese Journal of Applied Physics ◽

10.1143/jjap.29.765 ◽

1990 ◽

Vol 29 (Part 1, No. 4) ◽

pp. 765-766 ◽

Cited By ~ 2

Author(s):

Teruo Kaneda ◽

Tadahiro Kubota ◽

Jen-Shih Chang

Keyword(s):

Electric Field ◽

Discharge Tube ◽

Positive Column ◽

Capillary Discharge ◽

Gas Mixture ◽

Axial Electric Field ◽

Ar Gas

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Comments on "Electric current and electric field induced in the human body when exposed to an incident electric field near the resonant frequency" and "Electric fields induced in cells in the bodies of amateur radio operators by their transmitting antennas" [with reply]

IEEE Transactions on Microwave Theory and Techniques ◽

10.1109/22.915453 ◽

2001 ◽

Vol 49 (4) ◽

pp. 734-736

Author(s):

G.D. Lapin ◽

A.W. Guy ◽

R.W.P. King

Keyword(s):

Electric Field ◽

Resonant Frequency ◽

Electric Current ◽

Electric Fields ◽

Human Body ◽

Incident Electric Field ◽

Amateur Radio ◽

In Cells

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Voltage–current characteristics of high-current glow discharges

Applied Physics Letters ◽

10.1063/1.1369612 ◽

2001 ◽

Vol 78 (18) ◽

pp. 2646-2648 ◽

Cited By ~ 24

Author(s):

K. Takaki ◽

D. Taguchi ◽

T. Fujiwara

Keyword(s):

High Current ◽

Glow Discharges ◽

Current Characteristics

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ANALISIS PENGARUH PENETRASI MEDAN LISTRIK LINTANG TINGGI KE LINTANG RENDAH TERHADAP IONOSFER SAAT BADAI GEOMAGNET (ANALYSIS OF THE ELECTRIC FIELD PENETRATION EFFECT FROM HIGH TO LOW LATITUDES ON THE IONOSPHERE DURING GEOMAGNETIC STORM)

Jurnal Sains Dirgantara ◽

10.30536/j.jsd.2017.v14.a2368 ◽

2018 ◽

Vol 14 (2) ◽

pp. 97

Author(s):

Anwar Santoso ◽

Dadang Nurmali ◽

Mira Juangsih ◽

Iyus Edi Rusnadi ◽

Sri Ekawati ◽

...

Keyword(s):

Electric Field ◽

Electric Current ◽

High Latitude ◽

Delay Time ◽

Geomagnetic Storms ◽

Equatorial Electrojet ◽

Minimum Point ◽

Low Latitude ◽

Dst Index ◽

Low Latitudes

The influence of geomagnetic storms on the ionosphere in the equatorial and low latitudes can be either rising or falling value of the value foF2 with the different response delay time. The difference in response is one of them allegedly influenced by the modification of Equatorial Electrojet (EEJ) generated by the penetration of high latitude electric field towards the low latitude electric field and the equator. Therefore, this paper analyzes the influence of the high latitude penetration of electric current to the low latitude electric current towards the ionosphere response to Indonesia's current geomagnetic storms using the data foF2 BPAA Sumedang (SMD; 6,910 S; 106,830E geographic coordinates or 16,550 S; 179,950 E magnetic coordinates) and data from the Biak geomagnetic field station (BIK; 1,080 S; 136,050 E geographic coordinates or 9,730 S; 207,390 E magnetic coordinates) in 2000-2001. The result showed that the injection of the electric field of the high latitudes to lower latitudes causing foF2 BPAA Sumedang to be disturbed. Onset of the foF2 disturbance in BPAA Sumedang started coincide with EEJ(HBIK-HDRW) and reached its minimum point with a time delay between 0 to 4 hours before and after Dst index reached the minimum point. For a delay time of 0 to 4 hours after the Dst index reached the minimum point, the results were in accordance with the research results from the prior research. However, for the time difference of between 0 to 4 hours before the Dst index reached the minimum point, the results differ from their results. AbstrakPengaruh badai geomagnet terhadap ionosfer di ekuator dan lintang rendah berupa naiknya nilai foF2 atau turunnya nilai foF2 dengan waktu tunda respon berbeda-beda. Perbedaan respon tersebut salah satunya diduga dipengaruhi oleh modifikasi Equatorial electrojet (EEJ) yang dihasilkan oleh penetrasi medan listrik lintang tinggi sampai daerah lintang rendah dan ekuator. Oleh karena itu, dalam makalah ini dilakukan analisis pengaruh penetrasi arus listrik lintang tinggi ke lintang rendah terhadap ionosfer saat badai geomagnet menggunakan data foF2 dari Balai Pengamatan Antariksa dan Atmosfer (BPAA) Sumedang (SMD; 6,910 LS; 106,830 BT koordinat geografis atau 16,550 LS; 179,950 BT koordinat magnet) dan data medan geomagnet dari stasiun Biak (BIK; 1,080 LS; 136,050 BT koordinat geografis atau 9,730 LS; 207,390 BT koordinat magnet) tahun 2000-2001. Hasilnya diperoleh bahwa penetrasi medan listrik dari lintang tinggi ke lintang lebih rendah Indonesia menyebabkan foF2 BPAA Sumedang terganggu. Onset gangguan foF2 BPAA Sumedang mulai terjadi bertepatan dengan EEJ(HBIK-HDRW) mencapai titik minimumnya dengan jeda waktu antara 0 sampai 4 jam sebelum dan sesudah indeks Dst mencapai minimum. Untuk beda waktu 0 sampai 4 jam sesudah indeks Dst mencapai minimum, hasilnya bersesuaian dengan hasil penelitian peneliti sebelumnya. Namun, untuk beda waktu 0 sampai 4 jam sebelum indeks Dst mencapai minimum, hasilnya merupakan temuan berbeda dari hasil mereka.

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Time evolution of electric fields and currents and the generalized Ohm's law

Annales Geophysicae ◽

10.5194/angeo-23-1347-2005 ◽

2005 ◽

Vol 23 (4) ◽

pp. 1347-1354 ◽

Cited By ~ 19

Author(s):

V. M. Vasyliūnas

Keyword(s):

Electric Field ◽

Electric Current ◽

Time Evolution ◽

Time Scales ◽

Current Density ◽

Time Derivative ◽

Electron Plasma ◽

Displacement Current ◽

Ohm’S Law ◽

Ohm's Law

Abstract. Fundamentally, the time derivative of the electric field is given by the displacement-current term in Maxwell's generalization of Ampère's law, and the time derivative of the electric current density is given by the generalized Ohm's law. The latter is derived by summing the accelerations of all the plasma particles and can be written exactly, with no approximations, in a (relatively simple) primitive form containing no other time derivatives. When one is dealing with time scales long compared to the inverse of the electron plasma frequency and spatial scales large compared to the electron inertial length, however, the time derivative of the current density becomes negligible in comparison to the other terms in the generalized Ohm's law, which then becomes the equation that determines the electric field itself. Thus, on all scales larger than those of electron plasma oscillations, neither the time evolution of J nor that of E can be calculated directly. Instead, J is determined by B through Ampère's law and E by plasma dynamics through the generalized Ohm's law. The displacement current may still be non-negligible if the Alfvén speed is comparable to or larger than the speed of light, but it no longer determines the time evolution of E, acting instead to modify J. For theories of substorms, this implies that, on time scales appropriate to substorm expansion, there is no equation from which the time evolution of the current could be calculated, independently of ∇xB. Statements about change (disruption, diversion, wedge formation, etc.) of the electric current are merely descriptions of change in the magnetic field and are not explanations.

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