Ring current and interplanetary medium parameters

Pisarskij, V. Yu.; Feldstein, Y. I.; Rudneva, N. M.; Prigancova, A.; Třı́sková, L.

doi:10.1007/bf01649632

Cited by 15 publications

(7 citation statements)

References 12 publications

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“…According to the most common storm time index mentioned, as intense storm is defined by Dst < -100 nT (Tsurutani et al, 1988). If the DR index is utilized the fairly strict criterion for intense, moderate and weak storms exploited earlier by Pisarskij et al (1989) is as follows:…”

Section: Datamentioning

confidence: 99%

“…According to Table 2, following decay parameter models are applied. The rmodel I, the most flexible one as to the r variability, was suggested by Pisarskij et al (1989). For this model, r is assumed to be different for storms of distinctive intensity.…”

Section: Rc Modelingmentioning

confidence: 99%

“…The following iteration relation was utilized (Pisarskij et al, 1989): DR1 =(DIj_1(2-1/x1_1)+2F_1)/(2+I where each current DR1 value was derived from the previous (i -1) values of DR, z, and F. Le., the control of a calculated profile is exerted by these three quantities.…”

Section: Rc Modelingmentioning

confidence: 99%

“…Naturally, the accuracy of storm modeling by means of energy balance equation (Pisarskij et al, 1989) depends on adequate option of both the energy injection rate and time decay parameter model. In that study, the agreement of the modeled and observed profiles is characterized quantitatively by the standard deviation S and correlation coefficient r. The application of this approach for various storm models allows them to be juxtaposed on the quantitative basis.…”

Section: Rc Modelingmentioning

confidence: 99%

“…Earlier Akasofu (1981 b) and later Zwickl et al (1987) noted the z parameter to be drastically variable during a magnetic storm. Moreover, Pisarskij et al (1989) have accepted the decay parameter model which reflects a remarkable distinction of r values for storms of different intensity, rbeing dependent on the energy injection function during a storm main phase and on the DR variation field during a recovery phase. Considering magnetospheric storm dynamics, Prigancova and Feldstein (1991) compared some decay parameter models which were also used for RC magnetic field modeling (Feldstein, 1992;Prigancova et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Magnetic Storm Development and Its Quantification for Aims of Modeling.

Prigancova

Bielekova

Feldstein

1994

J. geomagn. geoelec

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Using a large sample of storms of different intensity the ring current magnetic field development is followed in terms of varying interplanetary conditions. It is shown that although the storm depression field is associated with energy input into the magnetosphere, the sustained IEF intensity <-5 mV/m as a condition for the occurrence of intense storms appears not to be of general validity. Quantification of the magnetic storm development indicates the role of the actual state of the magnetosphere in the development of its response on interplanetary medium forcing. Ring current energization is considered for some storm models represented by pairs of energy injection rate and time decay parameter. A number of models are juxtaposed quantitatively. The adequacy of modeling of storm profiles and the significance of decay parameter in the magnetic storm development is discussed from the viewpoint of consistency of energy injection rate and energy decay rate and also with regard to an adequate distribution of dissipated energy within the ring current region and auroral ionosphere.

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Section: Datamentioning

confidence: 99%

Section: Rc Modelingmentioning

confidence: 99%

Section: Rc Modelingmentioning

confidence: 99%

Section: Rc Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic Storm Development and Its Quantification for Aims of Modeling.

Prigancova

Bielekova

Feldstein

1994

J. geomagn. geoelec

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Modelling of the magnetic field of magnetospheric ring current as a function of interplanetary medium parameters

Feldstein

1992

Space Sci Rev

103

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Abstract. The models are examined which are proposed elsewhere for describing the magnetic field dynamics in ring-current DR during magnetic storms on the basis of the magnetospheric energy balance equation. The equation parameters, the functions of injection F and decay % are assumed to depend on interplanetary medium parameters (F and r during the storm main phase) and on ring-current intensity (z during the recovery phase). The present-day models are shown to be able of describing the DR variations to within a good accuracy (the r.m.s, deviation 5 < b < 15 nT, the correlation coefficient 0.85 < r < 1). The models describe a fraction of the geomagnetic field variation during a magnetic storm controlled by the geoeffective characteristic of interplanetary medium and, therefore responds directly to the variation of the latter. The fraction forms the basis of the geomagnetic field variations in low and middle latitudes. The shorter-term variations of DR are affected by the injections into the inner magnetosphere during substorm intervals.During magnetic storms, the auroral electrojets shift to subanroral latitudes. When determining the AE indices, the data from the anroral-zone stations must be supplemented with the data from subauroral observatories. Otherwise, erratic conclusions may be obtained concerning the character of the relationships of DR to AE or of AE to interplanetary medium parameters. Considering this circumstance, the auroral electrojet intensity during the main phase is closely related to the energy flux supplied to the ring current. It is this fact that gives rise simultaneously to the intensification of auroral electrojets and to the large-scale decrease of magnetic field in low latitudes.The longitudinal asymmetry of magnetic field on the Earth's surface is closely associated with the geoeffective parameters of interplanetary medium, thereby making it possible to model-estimate the magnetic field variations during magnetic storms at given observatories. The inclusion of the field asymmetry due to the system of large-scale currents improves significantly the agreement between the predicted and model field variations at subauroral and midlatitude observatories. The first harmonic amplitude of field variation increases with decreasing latitude. This means that the long-period component of the Ds,-variation asymmetry is due rather to the ring-current asymmetry, while the shorter-term fluctuations are produced by electrojets. The asymmetry correlates better with the AL indices (westward electrojet) than with the A U indices (eastward electrojet).The total ion energy in the inner magnetosphere during the storm main phase is sufficient for the magnetic field observed on the Earth's surface to be generated. The energy flux to the ring current is ~ 15 ~ of the e-energy flux into the magnetosphere.

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