The Magnetic Observatory on Tatuoca, Belém, Brazil: History and
Recent Developments

Morschhauser, A.; Soares, Gabriel Brando; Haseloff, Jürgen; Bronkalla, Oliver; Protasio, José; Pinheiro, Katia; Matzka, Jürgen

doi:10.5194/gi-2017-19

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…The original horizontal magnetic field variations, provided in the geographic reference frame ( X and Y ), are converted in the geomagnetic H (northward) and D (eastward) ones. The stations have a latitudinal separation of few degrees (∼6°), as reported in Table 2: the TTB observatory, situated very close to the dip equator, records magnetic field variations strongly influenced by the EEJ, while the KOU observatory, far enough from the dip equator, does not (Morschhauser et al., 2017). This particular configuration allows separating the magnetic signal of the EEJ from that of the solar quiet conditions currents and from the magnetospheric ring currents, as shown for the first time by Rastogi and Klobuchar (1990) (see also Manoj et al., 2006).…”

Section: Methodsmentioning

confidence: 99%

Ionospheric Response Over Brazil to the August 2018 Geomagnetic Storm as Probed by CSES‐01 and Swarm Satellites and by Local Ground‐Based Observations

et al. 2021

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The geomagnetic storm that occurred on 25 August 25 2018, that is, during the minimum of solar cycle 24, is currently the strongest ever probed by the first China Seismo‐Electromagnetic Satellite (CSES‐01). By integrating the in situ measurements provided by CSES‐01 (orbiting at altitude of 507 km) and by Swarm A satellite (orbiting at ca., 460 km) with ground‐based observations (ionosondes, magnetometers, and Global Navigation Satellite System receivers), we investigate the ionospheric response at lower‐ and mid‐latitudes over Brazil. Specifically, we investigate the electrodynamic disturbances driven by solar wind changes, by focusing on the disturbances driving modifications of the equatorial electrojet (EEJ). Our proposed multisensor technique analysis mainly highlights the variations in the topside and bottomside ionosphere, and the interplay between prompt penetrating electric fields and disturbance dynamo electric fields resulting in EEJ variations. Thanks to this approach and leveraging on the newly available CSES‐01 data, we complement and extend what recently investigated in the Western South American sector, by highlighting the significant longitudinal differences, which mainly come from the occurrence of a daytime counter‐EEJ during both 25 and 26 August at Braziliian longitudes and during part of 26 August only in the Peruvian sector. In addition, the increased thermospheric circulation driven by the storm has an impact on the EEJ during the recovery phase of the storm. The observations at the CSES‐01/Swarm altitudes integrated with the ground‐based observation recorded signatures of equatorial ionospheric anomaly crests formation and modification during daytime coupled with the positive ionospheric storm effects at midlatitude.

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Section: Methodsmentioning

confidence: 99%

Ionospheric Response Over Brazil to the August 2018 Geomagnetic Storm as Probed by CSES‐01 and Swarm Satellites and by Local Ground‐Based Observations

et al. 2021

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“…During this time, the Raspberry Pi was running almost continuously and we observed no problems concerning its reliability and stability in continuous operation. In addition, the system was installed at the Tatuoca observatory in Brazil (Morschhauser et al, 2017), where it was continuously running from November 2015 until a lightning strike in December 2016, and has been operational again since 20 February 2017. To date, the Raspberry Pi data logger provides a reliable platform.…”

Section: Discussionmentioning

confidence: 99%

“…Also, easily available hardware such as the Raspberry Pi embedded PC (Upton and Halfacree, 2016) has been used whenever possible, and no custom-made electronic circuit boards are necessary. The system hardware was tested at the Niemegk geomagnetic observatory and installed at the Tatuoca geomagnetic observatory in Brazil (Morschhauser et al, 2017). These systems run a previous version of the data acquisition software which is mainly based on shell and Perl scripts along with C code for serial communication.…”

Section: Introductionmentioning

confidence: 99%

A low-power data acquisition system for geomagnetic observatories and variometer stations

Morschhauser

Haseloff

Bronkalla

et al. 2017

Geosci. Instrum. Method. Data Syst.

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Abstract. A modern geomagnetic observatory must provide data of high stability, continuity, and resolution. The INTER-MAGNET network has therefore specified quantitative criteria to ensure a high quality standard of geomagnetic observatories. Here, we present a new data acquisition system which was designed to meet these criteria, in particular with respect to 1 Hz data. This system is based on a Raspberry Pi embedded PC and runs a C++ data acquisition software. As a result, the data acquisition system is modular, cheap, and flexible, and it can be operated in remote areas with limited power supply. In addition, the system is capable of near-realtime data transmission, using a reverse SSH tunnel to work with any network available. The system hardware was successfully tested at the Niemegk observatory for a period of 1 year and subsequently installed at the Tatuoca observatory in Brazil.

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“…TTB observatory was installed in 1957 by Observatório Nacional on the Tatuoca Island (in the Amazon River, close to Belém, Brazil) and has been operating since then (Gama, 1958). Since 2015, TTB is operated in cooperation with the GFZ German Research Centre for Geosciences (Morschhauser et al, 2017). During the Second International Polar Year, a temporary magnetic station was established and operated on Tatuoca Island from September 1933 to January 1934 (Olsen, 1951).…”

Section: Data and Modelmentioning

confidence: 99%

Evolution of the Geomagnetic Daily Variation at Tatuoca, Brazil, From 1957 to 2019: A Transition From Sq to EEJ

et al. 2020

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The magnetic equator in the Brazilian region has moved over 1,100 km northward since 1957, passing the geomagnetic observatory Tatuoca (TTB), in northern Brazil, around 2013. We recovered and processed TTB hourly mean values of the geomagnetic field horizontal (H) component from 1957 until 2019, allowing the investigation of long-term changes in the daily variation due to the influence of secular variation, solar activity, season, and lunar phase. The H day-today variability and the occurrence of the counter electrojet at TTB were also investigated. Until the 1990s, ionospheric solar quiet currents dominated the quiet-time daily variation at TTB. After 2000, the magnitude of the daily variation became appreciably greater due to the equatorial electrojet (EEJ) contribution. The H seasonal and day-today variability increased as the magnetic equator approached, but their amplitudes normalized to the average daily variation remained at similar levels. Meanwhile, the amplitude of the lunar variation, normalized in the same way, increased from 5% to 12%. Within the EEJ region, the occurrence rate of the morning counter electrojet (MCEJ) increased with proximity to the magnetic equator, while the afternoon counter electrojet (ACEJ) did not. EEJ currents derived from CHAMP and Swarm satellite data revealed that the MCEJ rate varies with magnetic latitude within the EEJ region while the ACEJ rate is largely constant. Simulations with the Thermosphere-Ionosphere-Electrodynamics General Circulation Model based on different geomagnetic main field configurations suggest that long-term changes in the geomagnetic daily variation at TTB can be attributed to the main field secular variation.

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The Magnetic Observatory on Tatuoca, Belém, Brazil: History and Recent Developments

Cited by 4 publications

References 5 publications

Ionospheric Response Over Brazil to the August 2018 Geomagnetic Storm as Probed by CSES‐01 and Swarm Satellites and by Local Ground‐Based Observations

Ionospheric Response Over Brazil to the August 2018 Geomagnetic Storm as Probed by CSES‐01 and Swarm Satellites and by Local Ground‐Based Observations

A low-power data acquisition system for geomagnetic observatories and variometer stations

Evolution of the Geomagnetic Daily Variation at Tatuoca, Brazil, From 1957 to 2019: A Transition From Sq to EEJ

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