Relation of PC index to the geomagnetic storm Dst variation

Трошичев, О. А.; Sormakov, D. A.; Janzhura, Alexander

doi:10.1016/j.jastp.2010.12.015

Cited by 29 publications

(31 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With forward convection (positive PC index values) the overall magnetic activity expressed, for instance, through auroral electrojet indices AE (e.g., Stauning, 2012), the midlatitude Kp indices (Stauning, 2012), and the ring current Dst indices (Stauning et al, 2008;Troshichev et al, 2011) generally increases with increasing PC index level. The development of global magnetic disturbances relates to the convection properties in both PCs and is more closely related to the non-negative, dual PC index formed from a qualified average of PCN and PCS than to either of the single PC PCN or PCS indices (Stauning, 2007).…”

Section: Pc Index Interpretationmentioning

confidence: 99%

Multi-station basis for Polar Cap (PC) indices: ensuring credibility and operational reliability

Stauning

2018

J. Space Weather Space Clim.

View full text Add to dashboard Cite

-The Polar Cap (PC) indices, PCN (North) and PCS (South) are based on polar geomagnetic observations from Qaanaaq (Thule) and Vostok, respectively, processed to measure the transpolar plasma convection that may seriously affect space weather conditions. To establish reliable space weather forecasts based on PC indices, and also to ensure credibility of their use for scientific analyses of solar windmagnetosphere interactions, additional sources of data for the PC indices are investigated. In the search for alternative index sources, objective quality criteria are established here to be used for the selection among potential candidates. These criteria are applied to existing PC index series to establish a quality scale. In the Canadian region, the data from Resolute Bay magnetometer are shown to provide alternative PCN indices of adequate quality. In Antarctica, the data from Concordia Dome-C observatory are shown to provide basis for alternative PCS indices. In examples to document the usefulness of these alternative index sources it is shown that PCN indices in a real-time version based on magnetometer data from Resolute Bay could have given 6 h of early warning, of which the last 2 h were "red alert", up to the onset of the strong substorm event on 13 March 1989 that caused power outage in Quebec. The alternative PCS indices based on data from Dome-C have helped to disclose that presently available Vostok-based PCS index values are corrupted throughout most of 2011.

show abstract

Section: Pc Index Interpretationmentioning

confidence: 99%

Multi-station basis for Polar Cap (PC) indices: ensuring credibility and operational reliability

Stauning

2018

J. Space Weather Space Clim.

View full text Add to dashboard Cite

show abstract

“…Just this version was used in all subsequent analyses of relationships between the PC index and magnetospheric substorm and geomagnetic storm fulfilled in AARI Troshichev et al, 2007Troshichev et al, , 2011Troshichev and Janzhura, 2009). These analyses clearly demonstrated that the PC growth always preceded the magnetic disturbances, that substorms onset and magnetic storms beginnings occur when the PC value exceeds the defined threshold level of ∼2 mV m −1 , that the intensity and variation of substorms are determined by the PC growth rate, that the storm magnitude (Dst peak) is proportional to the average PC value during the growth phase, and so on.…”

Section: Introductionmentioning

confidence: 99%

Invariability of relationship between the polar cap magnetic activity and geoeffective interplanetary electric field

2011

View full text Add to dashboard Cite

Abstract. The PC (polar cap) index characterizing the solar wind energy input into the magnetosphere is calculated with use of parameters α, β, and φ, determining the relationship between the interplanetary electric field (E KL ) and the value of magnetic activity δF in the polar caps. These parameters were noted as valid for large and small E KL values, and as a result the suggestion was made that the parameters should remain invariant irrespective of solar activity. To verify this suggestion, the independent sets of calibration parameters α, β, and φ were derived separately for the solar maximum (1998)(1999)(2000)(2001) and solar minimum (1997,(2007)(2008)(2009)) epochs, with a proper choice of a quiet daily variation (QDC) as a level of reference for the polar cap magnetic activity value. The results presented in this paper demonstrate that parameters α, β, and φ, derived under conditions of solar maximum and solar minimum, are indeed in general conformity and provide consistent (within 10 % uncertainty) estimations of the PC index. It means that relationship between the geoeffective solar wind variations and the polar cap magnetic activity responding to these variations remains invariant irrespective of solar activity. The conclusion is made that parameters α, β, and φ derived in AARI#3 version for complete cycle of solar activity (1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005) can be regarded as forever valid.

show abstract

“…The recent studies Janzhura et al, 2007, Troshichev & Janzhura, 2009Troshichev et al, 2011c) show that the PC index implication is more significant: the magnetospheric storms and substorms start only if the PC index reaches the definite threshold value (~ 2 mV/m for storms, and >1.5mV/m for substorms); the substorm growth phase duration and substorm intensity are determined by the PC growth rate and substorms are stopped as soon as PC index falls below 1-1.5 mV/m; the storm length is terminated by duration of period, when PC>2mV/m, the storm intensity being linearly related to the PC index averaged for the storm time interval; development of storms and substorms is better consistent with the PC behavior than with the coupling function variations; and so on. In addition, it turned out that the PC index adequately responds to sharp changes in the solar wind dynamic pressure.…”

Section: Resultsmentioning

confidence: 99%

“…Relationship between the 1-min PC index behavior and the storm depression development (Dst index) for epoch of solar maximum (1998)(1999)(2000)(2001)(2002)(2003)(2004) has been examined by Troshichev et al (2011c). Two criteria were used as a basic guideline to choose magnetic storms for the analysis: (1) magnetic storm duration should be longer than 12 hours, (2) magnetic storm depression should be larger than Dst = -30nT.…”

Section: Relation Of the Pc Index To Magnetic Stormsmentioning

confidence: 99%

“…9. Relationships between storm intensity Dst(peak) and quantities E KL growth and PCgrowth averaged over the storm growth phase interval, derived for categories of E KL < 6 mV/m and E KL > 6 mV/m (Troshichev et al, 2011c) conditions E KL >6 mV/m the efficiency of E KL strongly decreases (Dst=-35.6-16.05*E KL ), whereas relationship between Dst(peak) and PC is practically unchanged (Dst=8.2-32.6PC).…”

Section: Relation Of the Pc Index To Magnetic Stormsmentioning

confidence: 99%

See 1 more Smart Citation