First joint observations of space weather events over Mexico

Luz, V. De la; González-Esparza, A.; Sergeeva, M. A.; Corona‐Romero, P.; González, L. X.; Mejia‐Ambriz, J. C.; Valdés-Galicia, J. F.; Aguilar-Rodríguez, E.; Rodríguez-Martínez, M.; Romero‐Hernández, E.; Andrade, E.; Villanueva, P.A Labariega; Huipe-Domratcheva, E.; Cifuentes, Gerardo; Hernández, Eduardo; Monstein, C.

doi:10.5194/angeo-36-1347-2018

Cited by 8 publications

(3 citation statements)

References 46 publications

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“…These low‐latitude instruments (around 19° N geographic latitude, and 29° N geomagnetic latitude) record data in a region where the space weather effects have not been studied sufficiently due to the lack of the historical records (Denardini et al, ). Recently, De la Luz et al () registered, for the first time, global space weather effects over Mexico (ionospheric and geomagnetic disturbances, variations in cosmic rays fluxes, and radio communication's interferences) for two particular events: 22 June 2015 and 29 September 2015.…”

Section: Introductionmentioning

confidence: 99%

Space Weather Events, Hurricanes, and Earthquakes in Mexico in September 2017

et al. 2018

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In the interval of 4–10 September 2017, the Sun presented multiple solar flares from active region AR 2673. There were also coronal mass ejections that interacted with the Earth's magnetosphere. This solar activity produced several space weather events. These events were observed with ground‐based instruments of the Mexican Space Weather Service. The Mexican Array RadioTelescope detected highly perturbed solar transits associated with Type I radio emissions from active regions. The Compact Astronomical Low‐frequency, Low‐cost Instrument for Spectroscopy in Transportable Observatories‐Mexican Array RadioTelescope station detected several radio bursts including a Type III associated with the X8.2 flare on 10 September. The magnetometer detected variations reaching a regional K index of 8.3 during the geomagnetic storm. The ionosphere over Mexico was disturbed by different space weather phenomena with the dominant effects of the geomagnetic storm. We used total electron content data to study latitudinal and longitudinal ionospheric effects in this interval. The cosmic rays monitor detected a Forbush decrease associated also with the geomagnetic storm. This low‐latitude instrumental network in Mexico allowed estimating the regional response to space weather events. Coincidentally with the space weather events referred above, there were also two other types of natural hazards affecting the country at that moment, the hurricane Katia category 2 in the Gulf of Mexico, and two major earthquakes (7 and 19 September 2018). The conjunction of these natural phenomena were close to creating a worst‐case scenario in terms of civil protection reaction.

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Section: Introductionmentioning

confidence: 99%

Space Weather Events, Hurricanes, and Earthquakes in Mexico in September 2017

et al. 2018

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“…On the other hand, no influence of different radioemissions from astronomical sources occurred during the emission of SRB in MEXART records, according to the Low-Frequency Array (LOFAR) High-Band Array observations of the Herschel-ATLAS North Galactic Pole survey area and LOFAR Two-metre Sky Survey Additionally, some of these records have been related to solar space-weather events. CALLMEX spectra and lightcurves were automatically generated and were archived in the RICE repository De la Luz et al [2018]. The continuous monitoring of events in the 45 -225 MHz band, in the period of February 2014 to May 2019, allowed the detection of 156 SRB, from which 7 are Type II, one is Type I, and 148 are Type III from which 30 are accompanied by a Type V emission.…”

Section: Discussionmentioning

confidence: 99%

First Solar Radio Burst Observations by the Mexican Array Radio Telescope (MEXART) at 140 MHz

Huipe-Domratcheva,

De la Luz,

Casillas-Perez

et al. 2022

Preprint

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The National Laboratory of Space Weather in Mexico (Laboratorio Nacional de Clima Espacial: LANCE) coordinates instrumentation for monitoring the space-weather impact over Mexico. Two of these instruments are the Mexican Array Radio Telescope (MEXART) and Compound Astronomical Low frequency Low cost Instrument for Spectroscopy and Transportable Observatory (CALLISTO) station from the e-CALLISTO network (CALLMEX). Both instruments are located at the same facility (Coeneo Michoacan, Mexico) and share a spectral band centered at 140 MHz. In this work we show the capabilities of the e-CALLISTO network as support to identify a solar radio burst in the signal of the MEXART radiotelescope. We identify 75 solar radio bursts in the MEXART signal: five events of Type II and 70 of Type III between September 2015 and May 2019. The analysis of solar radio bursts in the MEXART signal provide us valuable information about the development of the radio event due their high sensitivity, time resolution, and isotropic response. For the case of Type III solar radio events, we identify three characteristic phases in the dynamical evolution of the signal at 140 MHz: a pre-phase, a main peak, a decay phase, and a post-event phase. A Morlet wave transform was done of MEXART signals in the Type III solar radio busts; in their spectra it was identified a pine tree structure preceding the main event in the time series. These characteristics are not observable in the data from the e-Callisto network.

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“…The vertical TEC from the previous version of the suggested technique (without constrains and several other issues) was experimentally checked in [ 58 , 59 ]. Those results also show relevant vertical TEC dynamics during space weather events.…”

Section: Technique Validation and Discussionmentioning

confidence: 99%

GNSS-Based Non-Negative Absolute Ionosphere Total Electron Content, its Spatial Gradients, Time Derivatives and Differential Code Biases: Bounded-Variable Least-Squares and Taylor Series

Yasyukevich

Mylnikova

Vesnin

2020

Sensors

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Global navigation satellite systems (GNSS) allow estimating total electron content (TEC). However, it is still a problem to calculate absolute ionosphere parameters from GNSS data: negative TEC values could appear, and most of existing algorithms does not enable to estimate TEC spatial gradients and TEC time derivatives. We developed an algorithm to recover the absolute non-negative vertical and slant TEC, its derivatives and its gradients, as well as the GNSS equipment differential code biases (DCBs) by using the Taylor series expansion and bounded-variable least-squares. We termed this algorithm TuRBOTEC. Bounded-variable least-squares fitting ensures non-negative values of both slant TEC and vertical TEC. The second order Taylor series expansion could provide a relevant TEC spatial gradients and TEC time derivatives. The technique validation was performed by using independent experimental data over 2014 and the IRI-2012 and IRI-plas models. As a TEC source we used Madrigal maps, CODE (the Center for Orbit Determination in Europe) global ionosphere maps (GIM), the IONOLAB software, and the SEEMALA-TEC software developed by Dr. Seemala. For the Asian mid-latitudes TuRBOTEC results agree with the GIM and IONOLAB data (root-mean-square was < 3 TECU), but they disagree with the SEEMALA-TEC and Madrigal data (root-mean-square was >10 TECU). About 9% of vertical TECs from the TuRBOTEC estimates exceed (by more than 1 TECU) those from the same algorithm but without constraints. The analysis of TEC spatial gradients showed that as far as 10–15° on latitude, TEC estimation error exceeds 10 TECU. Longitudinal gradients produce smaller error for the same distance. Experimental GLObal Navigation Satellite System (GLONASS) DCB from TuRBOTEC and CODE peaked 15 TECU difference, while GPS DCB agrees. Slant TEC series indicate that the TuRBOTEC data for GLONASS are physically more plausible.

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First joint observations of space weather events over Mexico

Cited by 8 publications

References 46 publications

Space Weather Events, Hurricanes, and Earthquakes in Mexico in September 2017

Space Weather Events, Hurricanes, and Earthquakes in Mexico in September 2017

First Solar Radio Burst Observations by the Mexican Array Radio Telescope (MEXART) at 140 MHz

GNSS-Based Non-Negative Absolute Ionosphere Total Electron Content, its Spatial Gradients, Time Derivatives and Differential Code Biases: Bounded-Variable Least-Squares and Taylor Series

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