Identification of the IMF sector structure in near-real time by ground magnetic data

Janzhura, Alexander; Трошичев, О. А.

doi:10.5194/angeo-29-1491-2011

Cited by 24 publications

(35 citation statements)

References 10 publications

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“…-The observed excessive deviations between real-time and final PC index values agree with expectations based on using here the cubic spline procedure and the example data provided in Janzhura and Troshichev (2011) to determine the solar wind sector terms included in the reference quiet levels (QL) used in the IAGA-endorsed calculations of real-time PC index values.…”

Section: Discussionsupporting

confidence: 78%

A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive excursions in the real-time index values

Stauning

2018

Ann. Geophys.

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Abstract. The Polar Cap (PC) indices were approved by the International Association for Geomagnetism and Aeronomy (IAGA) in 2013 and made available at the web portal http://pcindex.org holding prompt (real-time) as well as archival index values. The present note provides the first reported examination of the validity of the IAGA-endorsed method to generate real-time PC index values. It is demonstrated that features of the derivation procedure defined by Janzhura and Troshichev (2011) may cause considerable excursions in the real-time PC index values compared to the final index values. In examples based on occasional downloads of index values, the differences between real-time and final values of PC indices were found to exceed 3 mV m −1 , which is a magnitude level that may indicate (or hide) strong magnetic storm activity.

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Section: Discussionsupporting

confidence: 78%

A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive excursions in the real-time index values

Stauning

2018

Ann. Geophys.

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“…As a result, the daily run of the polar cap magnetic activity changes in such a manner that the daily mean value of activity either increases or decreases, being dependent on the sign of sector structure. A method for identification of the sector structure by the ground magnetic data and its consideration in the QDC calculation is presented in Janzhura and Troshichev (2011). The method of the automatic "on-line" derivation of the QDC irrespective of solar and magnetic activity and the IMF sector structure is one of the main advantages of the AARI#3 procedure that ensures online calculation of PC index.…”

Section: Peculiarities Of the Unified Procedures For Derivation Of Thementioning

confidence: 99%

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

2011

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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.

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“…1 of the commented paper by Janzhura and Troshichev (2011) reveals the above-mentioned feature of an extremely smooth variation of the daily peak-to-peak amplitudes throughout the days from 145 to 245 of year 2001 shown in the figure. However, on top of the daily variation there is a longer term modulation shifting the QDC level up or down.…”

Section: Inclusion Of Solar Sector Effects In Qdc Calculationsmentioning

confidence: 85%

“…The primary objective of the commented paper by Janzhura and Troshichev (2011) on identification of the IMF sector structure from ground magnetic data is well accomplished and interesting. Another issue presented in the paper is a new definition of the base level, the quiet day curve (QDC), used for deriving the disturbance geomagnetic variations to be used in polar cap (PC) index calculations.…”

Section: Discussionmentioning

confidence: 99%

Comments on quiet daily variation derivation in "Identification of the IMF sector structure in near-real time by ground magnetic data" by Janzhura and Troshichev (2011)

Stauning

2013

Ann. Geophys.

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Abstract. The description presented in the paper of the relations of the solar wind sector structure to the derivation of the quiet daily variation (QDC) in polar magnetic recordings used for calculation of polar cap (PC) indices is found to be unclear and not properly justified. The presented example on inclusion of a solar sector term in an actual QDC series is found to be questionable even on the authors' premises.

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Identification of the IMF sector structure in near-real time by ground magnetic data

Cited by 24 publications

References 10 publications

A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive excursions in the real-time index values

A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive excursions in the real-time index values

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

Comments on quiet daily variation derivation in "Identification of the IMF sector structure in near-real time by ground magnetic data" by Janzhura and Troshichev (2011)

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Identification of the IMF sector structure in near-real time by ground magnetic data

Cited by 24 publications

References 10 publications

A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive excursions in the real-time index values

A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive excursions in the real-time index values

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

Comments on quiet daily variation derivation in &quot;Identification of the IMF sector structure in near-real time by ground magnetic data&quot; by Janzhura and Troshichev (2011)

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Comments on quiet daily variation derivation in "Identification of the IMF sector structure in near-real time by ground magnetic data" by Janzhura and Troshichev (2011)