The Effects of Magnetospheric Convection on Atmospheric Electric Fields in the Polar Cap

Park, C. G.; Dejnakarintra, M.

doi:10.1007/978-3-642-85294-7_83

Cited by 10 publications

(12 citation statements)

References 18 publications

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“…During strong enough SPE this coupling becomes more effective so that J IS can become comparable or larger than J TS , so that the behavior of J z is dictated by variations of J IS . This suggestion is supported by results of [D'Angelo et al (1982] and [Park and Dejnakarintra, 1977]. Long balloon data obtained by D' Angelo et al (1982) show that moderately increased geomagnetic activity (by Kp>2) leads to enhanced contribution of the electric current J IS in J z at ~30 km, auroral latitudes.…”

Section: C) Interpretation Of Discrepancy Between Data and Former Thesupporting

confidence: 76%

Book of Proceedings Tenth Workshop Primorsko, Bulgaria 2018

Danov¹,

Georgieva²,

Kirov³

2018

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IIn ns st tr ru um me en nt ta at ti io on n f fo or r S Sp pa ac ce e W We ea at th he er r D Da at ta a P Pr ro oc ce es ss si in ng g a an nd d M Mo on ni it to or ri in ng g Sadovnichii V.A., Panasyuk M.I., Lipunov V.M., Bogomolov A.V., Bogomolov V.V. et.al. Monitoring of space radiation and other hazards in multi-satellite project `Universat-SOCRAT 123 S. Yerin, A. Stanislavsky, I. Bubnov, A. Konovalenko, P. Tokarsky, V. Zakharenko Small-sized radio telescopes for monitoring and studies of solar radio emission at meter and decameter wavelengths 129 M.M. Kalinichenko, O.O. Konovalenko, A.I. Brazhenko, N.V Šterc, D. Roša, D. Maričić, D. Hržina, I. Romštajn, A. Chilingarian, T. Karapetyan, D. Cafuta, M. Horvat Abstract.A powerful series of solar flares is occurred in the minimum of solar activity 2017 September 4 -11 over the active region AR12673. This active region produces two large and many small flares. The flare X8.2 is followed by solar cosmic rays. The active region at that time is situated on the back side of the Sun disk behind the Western limb. The front of the accelerated protons flux arrives to the Earth with the delay not exceeding the proton flight time from the Sun. Such proton propagation can occur only along the lines of the interplanetary magnetic field. There is no reason to believe that the mechanisms of cosmic ray acceleration on the Sun and other stars are of different nature. The flux of relativistic electrons does not show any connection with the solar cosmic rays. The results of SDO spacecraft are used to study the pre-flare state and flare development. The source of flare radiation in the spectral lines of the highly ionized irons FeXXIV and FeXXIII is observed in the corona. The emission of these spectral lines sharp increases during flare X-ray radiation appearing. The energy release of a flare occurs in the corona above an active region. The temperature in the flare is greater than 20 MK. The size of the hot plasma cloud is ~10 10 cm. IntroductionThe solar constant indicates an amazing stability of the solar thermonuclear reactor. The solar constant is 1367 W/m 2 . The change of the solar constant during the 11-year cycle of solar activity does not exceed ~10 -3 . Against the backdrop of this amazing stability of the Sun's work the big solar flares are observed several times per a year. The flare energy release takes place in the corona over a complex active region with a magnetic flux greater than 10 22Mx. The energy of a solar flare can exceed 10 32 erg. The flare duration is from 10 to 100 minutes. The flare is a manifestation of a number of physical processes, including X-ray radiation, the ejection of the corona substance and proton acceleration to the relativistic energy of not less than 20 GeV [Balabin et al., 2005; Podgorny and Podgorny, 2016].The Sun is the only astronomical object that generates proton pulses with the relativistic energy. The solar proton acceleration takes place along a singular line of the current sheet above an active region. The electric ...

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Section: C) Interpretation Of Discrepancy Between Data and Former Thesupporting

confidence: 76%

Book of Proceedings Tenth Workshop Primorsko, Bulgaria 2018

Danov¹,

Georgieva²,

Kirov³

2018

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“…Due in part to the payload location near the edge of the polar region, contributions from the ionospheric dynamo, electrified clouds or other tropospheric sources have not been completely ruled out. Assuming the horizontal fields are due solely to potential differences in the ionosphere, based on work by Park and Dejnakarintra [1977], SEPrelated increases in conductivity of would have little effect on large scale (>100 km) ionospheric horizontal electric field measurements mapped down to the stratosphere. Indeed, the horizontal electric field components did not disappear directly following SEP onset in both of the previous in-situ reports [Holzworth and Mozer, 1979;Holzworth et al, 1987].…”

Section: Discussionmentioning

confidence: 99%

Rapid fluctuations of stratospheric electric field following a solar energetic particle event

Kokorowski

Sample

Holzworth

et al. 2006

Geophysical Research Letters

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During January, 2005, there were several large X‐class solar flares and associated solar energetic particle (SEP) events. Coincidentally, the MINIS balloon campaign had multiple payloads aloft in the stratosphere above Antarctica measuring dc electric fields, conductivity and x‐ray flux. One‐to‐one increases in the electrical conductivity and decreases to near zero of both the vertical and horizontal electric field components were observed in conjunction with an increase in particle flux at SEP onset. Combined with an atmospheric electric field mapping model, these data are consistent with a shorting out of the global electric circuit and point toward substantial ionospheric convection modifications. Additionally, two subsequent, rapid changes were detected in the vertical electric field component several hours after SEP onset. These changes result in similar fluctuations in the calculated vertical current density. We will describe how rigidity cut‐off dynamics may be crucial in understanding these sudden jumps in the vertical electric field.

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“…[16] The eventual availability of simultaneous ionospheric potential and magnetic perturbation data from a network of stations at high latitudes may begin to produce a database that will answer this question. There is certainly ample evidence that ground level electric fields respond to transients of magnetospheric origin [Cobb, 1967;Mühleisen and Reiter, 1973;Park, 1976b;Park and Dejnakarintra, 1977;Reiter, 1977;Markson, 1979;Olson, 1983;Ruhnke et al, 1983;Holzworth et al, 1987;Rusakov et al, 1988;Bering et al, 1992Bering et al, , 1994aBering et al, , 1994bRuhnke, 1992;Byrne et al, 1993;Michnowski, 1998;Corney et al, 2003]. Atmospheric electricity observations correlated with geomagnetic variations and solar events suggest that extraterrestrial sources modulate the global circuit in the polar regions [Tinsley et al, 1998].…”

Section: Coupling Of Ionospheric and Magnetospheric Convection To Surmentioning

confidence: 99%

Seasonal variations of atmospheric electricity measured at Amundsen‐Scott South Pole Station

et al. 2004

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[1] Recent studies have shown that the general understanding of the Earth's global circuit is not entirely complete. Electric current originates from thunderstorm cloud tops and travels to the ionosphere, where it then leaks back down to the Earth's surface. Superimposed on this current is the dynamo generated from the interaction of the solar wind with Earth's magnetosphere. This paper investigates seasonal variations of the vertical electric field and current density as measured at the South Pole between 1991 and 1993. After initial data reduction, a model approach was used to decouple the magnetospheric and atmospheric components of the measurements. This approach calculated and subtracted the polar cap ionospheric potential from the measured data to obtain a signal of global tropospheric origin, in principle. The diurnal variations of the resulting data were averaged as a function of UT. These averages were calculated for the data as a whole and for the date sorted and binned by season and by magnetic activity level. The seasonally binned average results are consistent with recent papers indicating that the electric field measurement show global convective electrical activity to be a minimum during the Northern Hemisphere winter, in contradiction to the original 1929 Carnegie data. Because the electric field was a maximum during the Northern Hemisphere summer season, the midlatitude regions must contribute more strongly than the tropics to global atmospheric electricity. This analysis supports the link of electrical activity to global temperature. The magnetic activity binned results suggest that the polar cap potential model used underestimates the cross polar cap potential when there is a high K p index.

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The Effects of Magnetospheric Convection on Atmospheric Electric Fields in the Polar Cap

Cited by 10 publications

References 18 publications

Book of Proceedings Tenth Workshop Primorsko, Bulgaria 2018

Book of Proceedings Tenth Workshop Primorsko, Bulgaria 2018

Rapid fluctuations of stratospheric electric field following a solar energetic particle event

Seasonal variations of atmospheric electricity measured at Amundsen‐Scott South Pole Station

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