Cross polar cap diameter and voltage as a function of <i>PC</i> index and interplanetary quantities

Troshichev, O. A.; Hayakawa, H.; Matsuoka, A.; Mukai, T.; Tsuruda, K.

doi:10.1029/95ja03672

Cited by 87 publications

(127 citation statements)

References 24 publications

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“…One also has to note that the Ridley and Kihn (2004) work is limited to PCN<4-5 for winter and <3-4 for summer and this could account for some differences with our results. In terms of the linear slope, the SuperDARN data reported here are also consistent with the satellite-based CPCPs of Troshichev et al (1996) who reported the value of 19.35 kV/PCN.…”

Section: Discussionsupporting

confidence: 78%

“…To assess these dependencies, we performed linear fitting to the growing trend at small values of a respective parameter (obtained fit parameters are reported in Table 1) and asymptotic exponential fitting (red lines, obtained fit parameters are reported Ridley and Kihn (2004) through AMIE modeling. The yellow line is the linear relationship reported by Troshichev et al (1996). (e) The same as in (a) but for the Newell coupling function Ec.…”

Section: Cpcp As a Function Of E Kl Pcn And E Cmentioning

confidence: 74%

“…Both summer and winter SuperDARN data are consistent with AMIE results for PCN between 0 and ∼3 and visual diversion of the data occurs starting from PCN ∼4. The line of Troshichev et al (1996), which was obtained without considering the seasonal effect, have comparable slope but shifted down by ∼20 kV. Figure 2e and 2f shows variation of the CPCP with E C for summer and winter, respectively, in the same format as the data in Fig.…”

Section: Cpcp As a Function Of E Kl Pcn And E Cmentioning

confidence: 79%

“…Data by Hairston et al (2003) from the DMSP satellites show saturation values of ∼150-180 kV. Troshichev et al (1996) considered EXOS-D satellite measurements of the ion drift for the polar cap crossings and reported essentially a linear CPCP relationship upon the PC index up to ∼5.5 which would roughly correspond to IEF∼5 mV/m. Differences between CPCPs obtained for similar solar wind conditions but with different techniques is certainly a concern.…”

Section: Discussionmentioning

confidence: 99%

“…In Fig. 2c, d we also show the linear dependencies reported by Troshichev et al (1996), satellite estimates of the CPCP (yellow line), and by Ridley and Kihn (2004), AMIE modeling (green line). Both summer and winter SuperDARN data are consistent with AMIE results for PCN between 0 and ∼3 and visual diversion of the data occurs starting from PCN ∼4.…”

Section: Cpcp As a Function Of E Kl Pcn And E Cmentioning

confidence: 99%

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On the SuperDARN cross polar cap potential saturation effect

et al. 2009

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Abstract. Variation of the cross polar cap potential (CPCP) with the interplanetary electric field (IEF), the merging electric field E KL , the Polar Cap North (PCN) magnetic index, and the solar wind-magnetosphere coupling function E C of Newell et al. (2007) is investigated by considering convection data collected by the Super Dual Auroral Radar Network (SuperDARN) in the Northern Hemisphere. Winter and summer observations are considered separately. All variations considered show close to linear trend at small values of the parameters and tendency for the saturation at large values. The threshold values starting from which the non-linearity was evident were estimated to be IEF*∼E * KL ∼3 mV/m, PCN*∼3-4, and E * C ∼1.5×10 4 . The data indicate that saturation starts at larger values of the above parameters and reaches larger (up to 10 kV) saturation levels during summer. Conclusions are supported by a limited data set of simultaneous SuperDARN observations in the Northern (summer) and Southern (winter) Hemispheres. It is argued that the SuperDARN CPCP saturation levels and the thresholds for the non-linearity to be seen are affected by the method of the CPCP estimates.

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Section: Discussionsupporting

confidence: 78%

Section: Cpcp As a Function Of E Kl Pcn And E Cmentioning

confidence: 74%

Section: Cpcp As a Function Of E Kl Pcn And E Cmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Cpcp As a Function Of E Kl Pcn And E Cmentioning

confidence: 99%

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On the SuperDARN cross polar cap potential saturation effect

et al. 2009

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Large plasma density enhancements occurring in the northern polar region during the 6 April 2000 superstorm

Horvath

Lovell

2014

JGR Space Physics

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We focus on the ionospheric response of northern high-latitude region to the 6 April 2000 superstorm and aim to investigate how the storm-enhanced density (SED) plume plasma became distributed in the regions of auroral zone and polar cap plus to study the resultant ionospheric features and their development. Multi-instrument observational results combined with model-generated, two-cell convection maps permitted identifying the high-density plasma's origin and the underlying plasma transportation processes. Results show the plasma density feature of polar cap enhancement (PCE;~600 × 10 3 i + /cm 3 ) appearing for 7 h during the main phase and characterized by increases reaching up to 6 times of the quiet time values. Meanwhile, strong westward convections (~17,500 m/s) created low plasma densities in a wider region of the dusk cell. Oppositely, small (~750 m/s) but rigorous westward drifts drove the SED plume plasma through the auroral zone, wherein plasma densities doubled. As the SED plume plasma traveled along the convection streamlines and entered the polar cap, a continuous enhancement of the tongue of ionization (TOI) developed under steady convection conditions. However, convection changes caused slow convections and flow stagnations and thus segmented the TOI feature by locally depleting the plasma in the affected regions of the auroral zone and polar cap. From the strong correspondence of polar cap potential drop and subauroral polarization stream (SAPS), we conclude that the SAPS E-field strength remained strong, and under its prolonged influence, the SED plume provided a continuous supply of downward flowing high-density plasma for the development and maintenance of PCEs.

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Perturbation electric fields and disturbance currents investigated during the 25 September 1998 great storm

Horvath

Lovell

2014

JGR Space Physics

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This study investigates the ionosphere's response to the 25 September 1998 great storm and utilizes multi‐instrument observations covering the Australian (140°E; geographic) and Indian (75°E) longitude sectors. Results show the domination of eastward (westward) electrojet at 140°E (75°E). Its causative net eastward (westward) perturbation electric (E) field drove the forward (reverse) plasma fountain, caused the presence (absence) of the equatorial ionization anomaly (EIA). These strong longitudinal differences were due to a combination of various LT‐dependent, E field‐driven, and competing mechanisms. Perturbation E fields are identified as prompt penetration E field (PPEF) and disturbance dynamo E field (DDEF). Due to the later (earlier) local time at 140°E (75°E), the undershielding PPEF was eastward (westward) directed early in the main phase. A series of periodic substorms occurred during the recovery phase. The substorm‐related eastward PPEFs became overpowered by westward DDEFs over India but remained dominant in the Australian sector. Thus, eastward PPEFs (westward DDEFs) dominated at 140°E (75°E). At 140°E these eastward PPEFs exhibited a strong positive correlation with the variations of both the cross polar cap potential drop and the asymmetric ring current, significantly increased the net equatorial upward E × B drift and thus caused EIA development with plasma bubbles scintillating GPS signals. Based on the strong and independent correlation of these asymmetric ring current events with both the EIA development and the scintillation activity, we propose that the ASY‐H index could provide a natural tool for modeling EIA development and scintillation episodes during severe storms characterized by periodic substorm‐related eastward PPEFs.

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Cross polar cap diameter and voltage as a function of PC index and interplanetary quantities

Cited by 87 publications

References 24 publications

On the SuperDARN cross polar cap potential saturation effect

On the SuperDARN cross polar cap potential saturation effect

Large plasma density enhancements occurring in the northern polar region during the 6 April 2000 superstorm

Perturbation electric fields and disturbance currents investigated during the 25 September 1998 great storm

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