Asymmetry of the Earth's plasmasphere in the direction noon-midnight from Prognoz and Prognoz-2 data

Gringauz, K. I.; Безруких, В. В.

doi:10.1016/0021-9169(76)90036-2

Cited by 45 publications

(20 citation statements)

References 14 publications

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“…During more active periods, we observed that L PP peaks in the evening sector (between 16:00 and 01:00 MLT) and the smallest plasmapause expansions are found on the dayside (between 07:00 and 16:00 MLT). This is in agreement with results presented by O'Brien and Moldwin (2003) and Heilig and Lühr (2013), while this asymmetry was not found in any other studies (e.g., Gringauz and Bezrukikh, 1976;Carpenter and Anderson, 1992;Moldwin et al, 2002). Further, at enhanced magnetic activity, we observed a tendency for L PP to saturate as there is no L PP below a certain value (depending on the MLT sector).…”

Section: Discussionsupporting

confidence: 93%

“…According to our findings, L PP exhibits the largest values on the dayside (somewhere between 07:00 and 16:00 MLT) and smallest values in the postmidnight sector during low activity levels. This is in agreement with Gringauz and Bezrukikh (1976). By contrast, Moldwin et al (2002) noted a slight asymmetry in the noon-midnight direction, with an L PP peak in the night sector.…”

Section: Discussionsupporting

confidence: 86%

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The relationship between plasmapause, solar wind and geomagnetic activity between 2007 and 2011

Verbanac

Pierrard

Bandić³

et al. 2015

Ann. Geophys.

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Abstract. Taking advantage of the Cluster satellite mission and especially the observations made by the instrument WHISPER to deduce the electron number density along the orbit of the satellites, we studied the relationships between the plasmapause positions (L PP ) and the following L PP indicators: (a) solar wind coupling functions B z (Z component of the interplanetary magnetic field vector, B, in GSM system), BV (related to the interplanetary electric field; B is the magnitude of the interplanetary magnetic field vector, V is solar wind velocity), and d mp /dt (which combines different physical processes responsible for the magnetospheric activity) and (b) geomagnetic indices Dst, Ap and AE. The analysis is performed separately for three magnetic local time (MLT) sectors (Sector1 -night sector (01:00-07:00 MLT); Sector2 -day sector (07:00-16:00 MLT); Sector3 -evening sector (16:00-01:00 MLT)) and for all MLTs taken together. All L PP indicators suggest the faster plasmapause response in the postmidnight sector. Delays in the plasmapause responses (hereafter time lags) are approximately 2-27 h, always increasing from Sector1 to Sector3. The obtained fits clearly resolve the MLT structures. The variability in the plasmapause is the largest for low values of L PP indicators, especially in Sector2. At low activity levels, L PP exhibits the largest values on the dayside (in Sector2) and the smallest on the postmidnight side (Sector1). Displacements towards larger values on the evening side (Sector3) and towards lower values on the dayside (Sector2) are identified for enhanced magnetic activity. Our results contribute to constraining the physical mechanisms involved in the plasmapause formation and to further study the still not well understood related issues.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 86%

The relationship between plasmapause, solar wind and geomagnetic activity between 2007 and 2011

Verbanac

Pierrard

Bandić³

et al. 2015

Ann. Geophys.

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“…Angerami and Carpenter [1966] from whistler observation. The radial distance of the plasmapause is located to lower L shell on the nightside by Gringauz and Bezrukikh [1976] from Prognoz ion measurements. A similar statement is made by Maynard and Grebowsky [1977] from dc double probe instrument on Explorer 45 and by Carpenter [1981] from whistler observation.…”

Section: They Found the Bulge Located Between 2000 And 2100 Lt Whenmentioning

confidence: 99%

Electron density and plasmapause characteristics at 6.6 R_E: A statistical study of the GEOS 2 relaxation sounder data

Higel¹,

Wu²

1984

J. Geophys. Res.

121

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On board the geostationary GEOS 2, a relaxation sounding (RS) experiment using a pulsed active wave technique has been operated in the frequency range 0.3–77 kHz. In situ measurements of the equatorial magnetospheric electron density at L ≃ 6, obtained in the range from 0.1 to ∼100 cm−3 through on line data processing, are presented. The results from 4 months of routine operations (November 20, 1978–March 28, 1979) are statistically studied. Many features of the density distributions at 6.6 RE displayed from GEOS 2 RS data corroborate the morphological characteristics evidenced in past experimental data sets of magnetospheric density, like those from ground‐based whistler observation and from embarked particle experiments. In providing an improved accuracy—especially for the cold plasma density—and unique coverage in space and time, the GEOS 2 RS data set brings some extension of results. The average properties of different magnetospheric regions that can be sampled at 6.6 RE with respect to LT are focused: the dayside plasma trough, with a few cm−3 typically, the plasmaspheric bulge (a few tens of cm−3) and the associated plasmapause crossings (variations in cm−3 per minute), and the geosynchronous nightside where the density fluctuates in the lower range available (0.1–1 cm−3). The important contribution of cold plasma to the dayside magnetospheric density is reported. There are striking variabilities of the density distributions found from day to day, especially as far as the plasmaspheric bulge morphology is concerned. Relationships between geomagnetic activity and both the LT position and the LT width of the bulge are found. They confirm the role played by timing effects on the large scale convection patterns, which experimental and model studies performed earlier on the plasmapause dynamics have focused on.

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“…The intriguing aspect of plasmaspheric electric fields that concerns us is the reported "noon bulge" of plasma drift paths. It was singled out by Gringauz and Bezrukikh [1976] as being a common feature of their thermal ion measurements during quiet conditions. Carpenter and Seely [1976] and also found evidence for the bulge in whistler tracks recorded at Siple.…”

Section: Mid-latitude Electric Field Penetrationmentioning

confidence: 99%

An energy principle for high‐latitude electrodynamics

Barbosa¹

1984

J. Geophys. Res.

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A theoretical model for mid‐ and high‐latitude electric fields and currents is constructed using Fourier analysis methods. A two‐dimensional planar ionosphere with an enhanced conductivity auroral belt and field‐aligned currents at the edges is employed. The postulate that the electric field and currents adjust self‐consistently to minimize the global Joule dissipation rate defines a theoretical relation between the primary and secondary field‐aligned currents. This so‐called minimal dissipation configuration is examined using several input field‐aligned current models, and graphical solutions for the electric field and ionospheric current are shown. A detailed discussion and interpretation of the solutions with relation to diverse observations and high‐latitude phenomenology are included.

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Asymmetry of the Earth's plasmasphere in the direction noon-midnight from Prognoz and Prognoz-2 data

Cited by 45 publications

References 14 publications

The relationship between plasmapause, solar wind and geomagnetic activity between 2007 and 2011

The relationship between plasmapause, solar wind and geomagnetic activity between 2007 and 2011

Electron density and plasmapause characteristics at 6.6 R_E: A statistical study of the GEOS 2 relaxation sounder data

An energy principle for high‐latitude electrodynamics

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Asymmetry of the Earth's plasmasphere in the direction noon-midnight from Prognoz and Prognoz-2 data

Cited by 45 publications

References 14 publications

The relationship between plasmapause, solar wind and geomagnetic activity between 2007 and 2011

The relationship between plasmapause, solar wind and geomagnetic activity between 2007 and 2011

Electron density and plasmapause characteristics at 6.6 RE: A statistical study of the GEOS 2 relaxation sounder data

An energy principle for high‐latitude electrodynamics

Contact Info

Product

Resources

About

Electron density and plasmapause characteristics at 6.6 R_E: A statistical study of the GEOS 2 relaxation sounder data