Abstract
Abstract. This case study developed a method for data processing over six years, from 2004 to 2010, of 70 keV–2.3 MeV electrons recorded by the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite. Short time increases in electron counting rates, having 99% probabilities of not being Poisson fluctuations, were statistically selected using geomagnetic invariant space and called electron bursts. Temporal series were analysed confirming the seasonal variations in low energy bands of 70–450 keV. Differently from previous results, the DEMETER results exhibited two peaks of electron bursts: one in the period June–August and one in the period December–February annually. Specifically, six earthquake cases are presented in detail having increases in electron burst number prior to events. Moreover, electron burst precipitation occurring before each strong earthquake of the entire period over the life of the satellite with M ≥ 7.0 was verified as having a probability greater than 97% of not being of a statistical origin. Low energetic electrons in 70–330 keV resulted occurring more frequently near seismic activity than those observed in 330 keV–2.34 MeV energy bands at the satellite altitude in the ionosphere.
Highlights
Over the past decade, correlations between high energy electron bursts (EBs) in near Earth space and earthquakes have been reported in several studies
This case study developed a method for data processing over six years, from 2004 to 2010, of 70 keV– 2.3 MeV electrons recorded by the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite
The Instrument for the Detection of Particle (IDP) spectrometer on DEMETER was designed to detect for weak electron fluxes at low-latitude, which are principally located below the Van Allen belts (VAB) at the altitude of about 710 km (Sauvaud et al, 2006)
Summary
Correlations between high energy electron bursts (EBs) in near Earth space and earthquakes have been reported in several studies. Zhang et al.: Burst increases of precipitating electrons recorded by the DEMETER satellite thereby inducing their exit from the trapping condition (Abel and Thorne, 1998) To this regard, Imhof et al (1981a) report on narrow peaks in energy spectra of inner radiation belt electrons. Since the launch of the DEMETER (Detection of ElectroMagnetic Emissions Transmitted from Earthquake Regions) satellite on 29 June 2004, several studies investigating high energy particle precipitation have been published. To this regard, Parrot et al (2006) reported on an earthquake having a magnitude of 7.3, and taking place on 22 November 2004, northeast of New Zealand (46.57◦ S, 164.83◦ N). A study of EB time evolutions can be found in Sect. 3, while a comparison between EB statistical distributions and seismic activity is reported in Sect. 4, whereas Sect. 5 presents the conclusions
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