Noise in raw data from magnetic observatories

Khomutov, Sergey; Mandrikova, Oksana; Budilova, E. A.; Arora, Kusumita; Lingala, Manjula

doi:10.5194/gi-6-329-2017

Cited by 18 publications

(20 citation statements)

References 8 publications

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“…Such perturbations penetrate simultaneously at all longitudinal sectors and follow the same trend as B z oscillations (Kikuchi et al, 1996). However, the short‐period observed oscillations which are not simultaneous may be associated with local noise at the respective station (Khomutov et al, 2017). The process of penetration of the magnetospheric convection electric field varies with longitude; in this regard Fejer et al, (2008) established a model of PPEF based on ROCSAT satellite measurements.…”

Section: Discussionmentioning

confidence: 99%

Ionospheric and Magnetic Signatures of a Space Weather Event on 25–29 August 2018: CME and HSSWs

et al. 2020

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We present a study concerning a space weather event on 25–29 August 2018, accounting for its ionospheric and magnetic signatures at low latitudes and midlatitudes. The effects of a storm in several longitudinal sectors (Asia, Africa, America, and the Pacific) have been analyzed using various parameters such as total electron content (TEC), geomagnetic field, and column [O/N2] ratio. Positive ionospheric storms are found in all the longitudinal sectors having its maximum effects in the Asian sector, whereas the negative ionospheric storms have been observed in the summer hemisphere (Northern Hemisphere). A large decrease in [O/N2] ratio in the Northern Hemisphere is a possible cause of the observed negative storm effects. Ionospheric F2 region maximum electron density (NmF2) and TEC have shown a positive correlation during this storm. The study suggests that storm time‐generated wind does not have a uniform planetary extension and mainly affects dayside (America and Pacific) and duskside (Africa) sectors. During the space weather event, we observe an asymmetric variation of the magnetic field as a function of the longitude. On the other hand, the magnetic variations at midlatitudes are found to be symmetric in both hemispheres. A signature of the disturbance dynamo (anti‐Sq circulation) has been observed, mainly at low latitudes. We emphasize that the partial ring current (PRC), estimated by the ASYM‐H magnetic index, must also be taken into account along with the SYM‐H index for a better approximation of ionospheric currents. The study further suggests existence of several electric current cells in the ionosphere, which is consistent with the Blanc‐Richmond model.

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Section: Discussionmentioning

confidence: 99%

Ionospheric and Magnetic Signatures of a Space Weather Event on 25–29 August 2018: CME and HSSWs

et al. 2020

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“…Table 1 provides general information about these observatories, and Figure 1 shows the data status graphically. More detailed description of modern equipment of there observatories is presented in [6,7]. Due to various problems during perestroika in the 90s, many magnetic observatories in the former USSR, including the observatories of IKIR FEB RAS, significantly reduced their activity.…”

Section: State Of An Archival Data Of the Magnetic Observatories Of Imentioning

confidence: 99%

Some problems with old magnetic data processing

Khomutov

Lingala

2020

E3S Web Conf.

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Continues magnetic measurements at the IKIR FEB RAS obser-vatories Magadan (MGD), Paratunka (PET), Yuzhno-Sakhalinsk (YSS), Cape Schmidt (CPS) and Khabarovsk (KHB) and CSIR-NGRI observatories Hyder-abad (HYB) and Choutuppal (CPL) have been started almost since their formation. A significant part of the results obtained is presented in the WDC and INTERMAGNET databases. However, a large amount of raw data remains un-processed and unavailable for using by scientific community. In the past few years, institutes has been making efforts to process and reprocess old magnetic data. Digital images of analog magnetograms of the Observatory Paratunka since 1967 were obtained and the possibility of their use for calculation hourly and minute values of magnetic field elements was evaluated. Old digital data that was available during the conversion from analog to digital magnetometers is processed. The main problem of processing or re-processing archived data is the lack of information (metadata) about the measurement conditions. First of all, these are the results of absolute observations, which are necessary to obtain the values of the elements of the total field vector. In this paper, some technologies are proposed that allow to use the data obtained during processing of analog magnetograms to adjust the digital magnetometers records. A signif-icant problem is the lack or inaccuracy of information about the temperature conditions in the variation pavilion, about magnetometers or support equipment maintenance or about works in and near the pavilions. As we accumulate the experience during the processing of old magnetic data, a “catalog” of noise and its typical images is formed. This makes it more reliable and efficient to identify and remove this noise from records.

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“…The exchange of primary data and standardization of measurements at magnetic observatories (MO) of IKIR are a good tool for choice of the optimal parameters of magnetometers (for example, dIdD or POS-1), for identification of errors and failures in device operation, for the detection and interpretation of noise [14]. As an example of the joint processing of IKIR IMOs data, Figure 7 shows fragments of the magnetic declination D records on 24.05.2013, on which a signal from a strong earthquake with a magnitude of Ms=7.5 is observed.…”

Section: Observatories Of Ikir Feb Rasmentioning

confidence: 99%

International project INTERMAGNET and magnetic observatories of Russia: cooperation and progress

Khomutov

2018

E3S Web Conf.

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Various aspects of international network of magnetic observatories INTERMAGNET such as standards, requirements for magnetic measurements, different status of published data, etc. are considered. Modern state of Russian segment of INTERMAGNET, its significance and contribution to global network are estimated. The features of monitoring of Earth's magnetic field at observatories Paratunka (PET), Magadan (MGD), Khabarovsk (KHB) and Cape Schmidt (CPS) of IKIR FEB RAS and prospects are presented in

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Noise in raw data from magnetic observatories

Cited by 18 publications

References 8 publications

Ionospheric and Magnetic Signatures of a Space Weather Event on 25–29 August 2018: CME and HSSWs

Ionospheric and Magnetic Signatures of a Space Weather Event on 25–29 August 2018: CME and HSSWs

Some problems with old magnetic data processing

International project INTERMAGNET and magnetic observatories of Russia: cooperation and progress

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