New aspects in plasmaspheric ion temperature variations from INTERBALL 2 and MAGION 5 measurements

Котова, Г. А.; Безруких, В. В.; Веригин, М. И.; Šmilauer, J.

doi:10.1016/j.jastp.2007.08.054

Cited by 10 publications

(3 citation statements)

References 16 publications

(23 reference statements)

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“…As such, it is easier to isolate the relationship between the cold ion temperature and L, which is shown in Figure 5. This positive correlation between the temperature and L has been shown in previous studies [Comfort et al, 1985;Comfort, 1996;Kotova et al, 2008] and is consistent with (a) the inverse correlation between the temperature and cold ion density and (b) the inverse relationship between the cold ion density and L.…”

Section: Coupling Between Plasma Parametersmentioning

confidence: 99%

Temperature of the plasmasphere from Van Allen Probes HOPE

et al. 2017

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We introduce two novel techniques for estimating temperatures of very low energy space plasmas using, primarily, in situ data from an electrostatic analyzer mounted on a charged and moving spacecraft. The techniques are used to estimate proton temperatures during intervals where the bulk of the ion plasma is well below the energy bandpass of the analyzer. Both techniques assume that the plasma may be described by a one‐dimensional trueE→×trueB→ drifting Maxwellian and that the potential field and motion of the spacecraft may be accounted for in the simplest possible manner, i.e., by a linear shift of coordinates. The first technique involves the application of a constrained theoretical fit to a measured distribution function. The second technique involves the comparison of total and partial‐energy number densities. Both techniques are applied to Van Allen Probes Helium, Oxygen, Proton, and Electron (HOPE) observations of the proton component of the plasmasphere during two orbits on 15 January 2013. We find that the temperatures calculated from these two order‐of‐magnitude‐type techniques are in good agreement with typical ranges of the plasmaspheric temperature calculated using retarding potential analyzer‐based measurements—generally between 0.2 and 2 eV (2000–20,000 K). We also find that the temperature is correlated with L shell and hot plasma density and is negatively correlated with the cold plasma density. We posit that the latter of these three relationships may be indicative of collisional or wave‐driven heating of the plasmasphere in the ring current overlap region. We note that these techniques may be easily applied to similar data sets or used for a variety of purposes.

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Section: Coupling Between Plasma Parametersmentioning

confidence: 99%

Temperature of the plasmasphere from Van Allen Probes HOPE

et al. 2017

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“…The statistical study of Förster and Jakowski (2000) revealed that weak magnetic storms in winter can cause a detectable (~20%) decrease of the night-time total electron content (TEC) at mid-latitudes, which they attributed to plasmasphere depletion during storms. Satellite observations discussed by Kotova et al (2008) and Verigin et al (2011) showed that moderate storms can lead to partial depletion of the plasmasphere. Kotov et al (2018) studied the effects of the very weak storm of 24 December 2017 at Kharkiv (L = 2.1).…”

Section: Introductionmentioning

confidence: 99%

Weak Magnetic Storms Can Modulate Ionosphere‐Plasmasphere Interaction Significantly: Mechanisms and Manifestations at Mid‐Latitudes

et al. 2019

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A comprehensive study of the response of the ionosphere-plasmasphere system at mid-latitudes to weak (Dst min > −50 nT) magnetic storms is presented. For the first time, it is shown that weak magnetic disturbances can lead to significant modulation of ionosphere-plasmasphere H + ion fluxes. It is found that this modulation is caused by the enhancements/reductions of the topside O + ion density, which is induced by F2-layer peak height rise and fall during the storms. The F2-layer motion is caused by thermospheric wind changes and by a penetration electric field. Both drivers are closely related to the changes in the B z component of interplanetary magnetic field. The most prominent manifestation of the H + ion flux modulation is strong changes in H + ion fraction in the topside ionosphere. This study also indicates that the NRLMSISE-00 model provides the correct relative changes of neutral H density during weak magnetic storms and also that there is a compelling need to include geomagnetic activity indices, in addition to solar activity (F 10.7 ), as input parameters to empirical topside ionosphere models.

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“…In the present consideration, the experimental data along the spacecraft orbit are approximated by the power dependence T p = T 1 Á L p . However, it is known that in the plasmasphere the temperature depends at least on magnetic local time [Kotova et al, 2002], besides, even in the inner plasmasphere the temperature in the noon-to-dusk MLT sector significantly changes along magnetic field lines [Kotova et al, 2008]. Thus, this point should also be improved in the next studies, which can also include the study of dependence for the six physical parameters of the present model: L S , a, φ 0 , N ex , L p and the plasmapause filling factor α, on solar wind and geomagnetic activity variations.…”

Section: Discussionmentioning

confidence: 99%

Physics‐based reconstruction of the 3‐D density distribution in the entire quiet time plasmasphere from measurements along a single pass of an orbiter

2015

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The data base of the Alpha-3/Interball-1 measurements was used for semiempirical 3-D modeling of plasma distribution inside the plasmasphere for quiet (stationary) geomagnetic conditions. A 2-D model describing the density distribution in the meridional plane is based on equations of the plasma distribution in the plasmasphere for the cases of thermal equilibrium and collisionless initial partial filling of plasmaspheric shells. This 2-D model is then expanded into a 3-D one using simple equations for the shape of the plasmapause and density behavior in the equatorial plane along the convection streamline. The model has six free parameters with clear physical meaning. This modeling approach can be applied for extrapolation of data from magnetospheric satellites with very different orbits into the entire plasmasphere.

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New aspects in plasmaspheric ion temperature variations from INTERBALL 2 and MAGION 5 measurements

Cited by 10 publications

References 16 publications

Temperature of the plasmasphere from Van Allen Probes HOPE

Temperature of the plasmasphere from Van Allen Probes HOPE

Weak Magnetic Storms Can Modulate Ionosphere‐Plasmasphere Interaction Significantly: Mechanisms and Manifestations at Mid‐Latitudes

Physics‐based reconstruction of the 3‐D density distribution in the entire quiet time plasmasphere from measurements along a single pass of an orbiter

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