E. Echer
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View article: Ground-based Observations of Temporal Variation of the Cosmic-Ray Spectrum during Forbush Decreases
Ground-based Observations of Temporal Variation of the Cosmic-Ray Spectrum during Forbush Decreases Open
Observations of temporary Forbush decreases (FDs) in the Galactic cosmic-ray (GCR) flux due to the passage of solar storms are useful for space-weather studies and alerts. Here, we introduce techniques that use global networks of ground-ba…
View article: Solar Cycle and Seasonal Dependences of Field‐Aligned Currents
Solar Cycle and Seasonal Dependences of Field‐Aligned Currents Open
Enhancements of Birkeland field‐aligned currents (FACs) have been reported during magnetospheric substorms and geomagnetic storms. While FACs related to geomagnetic disturbances have been extensively studied, the long‐term variations of FA…
View article: NORAD tracking of the 2022 February Starlink satellites and the immediate loss of 32 satellites
NORAD tracking of the 2022 February Starlink satellites and the immediate loss of 32 satellites Open
In this work, North American Aerospace Defense Command (NORAD) tracking of the SpaceX Starlink satellite launch on 3 February 2022 is reviewed. Of the 49 Starlink satellites released into orbit, 38 were eventually lost. A total of 32 of th…
View article: Global Analysis of the Extended Decreases in Cosmic Rays Observed with Worldwide Networks of Neutron Monitors and Muon Detectors: Temporal Variation of the Rigidity Spectrum and Its Implication
Global Analysis of the Extended Decreases in Cosmic Rays Observed with Worldwide Networks of Neutron Monitors and Muon Detectors: Temporal Variation of the Rigidity Spectrum and Its Implication Open
This paper presents the global analysis of two extended decreases in the galactic cosmic-ray intensity observed by worldwide networks of ground-based detectors in 2012. This analysis is capable of separately deriving the cosmic-ray density…
View article: Global analysis of the extended cosmic-ray decreases observed with world-wide networks of neutron monitors and muon detectors; temporal variation of the rigidity spectrum and its implication
Global analysis of the extended cosmic-ray decreases observed with world-wide networks of neutron monitors and muon detectors; temporal variation of the rigidity spectrum and its implication Open
This paper presents the global analysis of two extended decreases of the galactic cosmic ray intensity observed by world-wide networks of ground-based detectors in 2012. This analysis is capable of separately deriving the cosmic ray densit…
View article: Effect of the Earth’s declination variation on characteristics of Jovian decametric radio emissions
Effect of the Earth’s declination variation on characteristics of Jovian decametric radio emissions Open
Context. The variation in the Jovicentric sub-latitude (declination, D E ) of a radio observer of Jupiter has long been known to affect the observation of Jupiter’s decametric (DAM) radio emissions due to these emissions’ anisotropic natur…
View article: Predicting Interplanetary Shock Occurrence for Solar Cycle 25: Opportunities and Challenges in Space Weather Research
Predicting Interplanetary Shock Occurrence for Solar Cycle 25: Opportunities and Challenges in Space Weather Research Open
Interplanetary (IP) shocks are perturbations observed in the solar wind. IP shocks correlate well with solar activity, being more numerous during times of high sunspot numbers. Earth‐bound IP shocks cause many space weather effects that ar…
View article: Inner Radiation Belt Simulations During the Successive Geomagnetic Storm Event of February 2022
Inner Radiation Belt Simulations During the Successive Geomagnetic Storm Event of February 2022 Open
Starting from 29 January 2022, a series of solar eruptions triggered a moderate geomagnetic storm on 3 February 2022, followed subsequently by another. Despite the typically minimal impact of unintense storms on space technology, 38 out of…
View article: NORAD Tracking of the 2022 February Starlink Satellites and the Immediate Loss of 32 Satellites
NORAD Tracking of the 2022 February Starlink Satellites and the Immediate Loss of 32 Satellites Open
The North American Aerospace Defense Command (NORAD) tracking of the SpaceX Starlink satellite launch on 2022 February 3 is reviewed. Of the 49 Starlink satellites released into orbit, 38 were eventually lost. Thirty-two of the satellites …
View article: Ultra-relativistic Electron Acceleration during High-intensity Long-duration Continuous Auroral Electrojet Activity Events
Ultra-relativistic Electron Acceleration during High-intensity Long-duration Continuous Auroral Electrojet Activity Events Open
Magnetospheric relativistic electrons are accelerated during substorms and strong convection events that occur during high-intensity long-duration continuous auroral electrojet activity (HILDCAA) events, associated with solar wind high-spe…
View article: Analysis of temporal variation of cosmic ray intensity observed with global networks of neutron monitors and muon detectors
Analysis of temporal variation of cosmic ray intensity observed with global networks of neutron monitors and muon detectors Open
The temporal variation of cosmic ray intensity recorded by a ground-based detector includes contributions from varying cosmic ray density (or isotropic intensity) and anisotropy in space. We deduce these contributions separately and accura…
View article: Data mining of cosmic-ray anisotropy observed with the Global Muon Detector Network
Data mining of cosmic-ray anisotropy observed with the Global Muon Detector Network Open
Ground-based muon detectors are sensitive to anisotropies of cosmic rays at approximately 50 GeV and have been operated with great stability for over 10 years. The anisotropy is controlled by the space environment in various time scales an…
View article: NORAD Tracking of the February 2022 Starlink Satellites (and the Possible Immediate Loss of 32 Satellites)
NORAD Tracking of the February 2022 Starlink Satellites (and the Possible Immediate Loss of 32 Satellites) Open
The North American Aerospace Defense Command (NORAD) tracking of the SpaceX Starlink satellite launch on February 03, 2022 is reviewed. Of the 49 Starlink satellites released into orbit, 38 were eventually lost. Thirty-two of the satellite…
View article: Large-amplitude Bidirectional Anisotropy of Cosmic-Ray Intensity Observed with Worldwide Networks of Ground-based Neutron Monitors and Muon Detectors in 2021 November
Large-amplitude Bidirectional Anisotropy of Cosmic-Ray Intensity Observed with Worldwide Networks of Ground-based Neutron Monitors and Muon Detectors in 2021 November Open
We analyze the cosmic-ray variations during a significant Forbush decrease observed with worldwide networks of ground-based neutron monitors and muon detectors during 2021 November 3–5. Utilizing the difference between primary cosmic-ray r…
View article: Search for Jovian decametric emission induced by Europa on the extensive Nançay Decameter Array catalog
Search for Jovian decametric emission induced by Europa on the extensive Nançay Decameter Array catalog Open
Context. The electrodynamic interaction between the Galilean satellites and the Jovian magnetosphere generates Alfvén wings that connect the satellites to the polar atmosphere of Jupiter and induce auroral radiation through the cyclotron-m…
View article: Using wavelet decomposition method to retrieve the solar and the global air temperature signals from Greenland, Andes and East Antarctica δ18O ice core records
Using wavelet decomposition method to retrieve the solar and the global air temperature signals from Greenland, Andes and East Antarctica δ18O ice core records Open
The surface global air temperature (SGAT) and the solar activity presented near similar trends until approximately the 1980's decade, when they start to diverge significantly. This divergence in both time series is attributed to the impact…
View article: Investigation of Pc5 pulsations effects andmagnetospheric processes during intense geomagneticstorms
Investigation of Pc5 pulsations effects andmagnetospheric processes during intense geomagneticstorms Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Earth and Space Science. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more ab…
View article: Seasonal features of geomagnetic activity: a study on the solar activity dependence
Seasonal features of geomagnetic activity: a study on the solar activity dependence Open
Seasonal features of geomagnetic activity and their solar-wind–interplanetary drivers are studied using more than five solar cycles of geomagnetic activity and solar wind observations. This study involves a total of 1296 geomagnetic storms…
View article: Jupiter's Auroral Radio Emissions Observed by Cassini: Rotational Versus Solar Wind Control, and Components Identification
Jupiter's Auroral Radio Emissions Observed by Cassini: Rotational Versus Solar Wind Control, and Components Identification Open
Reanalyzing Cassini radio observations performed during Jupiter's flyby of 2000–2001, we study the internal (rotational) versus external (solar wind) control of Jupiter's radio emissions, from kilometer to decameter wavelengths, and the re…
View article: Advection of Martian Crustal Magnetic Fields by Ionospheric Plasma Flow Observed by the MAVEN Spacecraft
Advection of Martian Crustal Magnetic Fields by Ionospheric Plasma Flow Observed by the MAVEN Spacecraft Open
The plasma environment of Mars is highly influenced by its crustal magnetic fields. In this work, we investigate whether the crustal magnetic fields can be displaced from their original positions due to advection by ionospheric plasma flow…
View article: Jupiter's auroral radio emissions observed by Cassini: rotational versus solar wind control, and components identification
Jupiter's auroral radio emissions observed by Cassini: rotational versus solar wind control, and components identification Open
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Space Physics. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: Identification of the Planetary Magnetosphere Boundaries with the Wavelet Multi-Resolution Analysis
Identification of the Planetary Magnetosphere Boundaries with the Wavelet Multi-Resolution Analysis Open
The Haar wavelet decomposition technique is used to detect the planetary magnetosphere boundaries and discontinuities. We use the magnetometer data from the CASSINI and MESSENGER spacecraft to identify the abrupt changes in the magnetic fi…
View article: Seasonal features of geomagnetic activity: evidence for solar activity dependence?
Seasonal features of geomagnetic activity: evidence for solar activity dependence? Open
Seasonal features of geomagnetic activity and their solar wind-interplanetary drivers are studied using more than 5 solar cycles of geomagnetic activity and solar wind observations. This study involves a total of 1239 geomagnetic storms of…
View article: A Peculiar ICME Event in August 2018 Observed With the Global Muon Detector Network
A Peculiar ICME Event in August 2018 Observed With the Global Muon Detector Network Open
We demonstrate that global observations of high‐energy cosmic rays contribute to understanding unique characteristics of a large‐scale magnetic flux rope causing a magnetic storm in August 2018. Following a weak interplanetary shock on Aug…
View article: Setting plasma parameters for automated interplanetary shocks detection
Setting plasma parameters for automated interplanetary shocks detection Open
Society's technological advancement, marked by the use of artificial satellites, requires a better understanding of Sun-Earth interactions.The solar wind and associated events, such as coronal mass ejections and corotating interaction regi…
View article: Interplanetary shocks at 5 AU and their effects on Jupiter's decametric radio emissions
Interplanetary shocks at 5 AU and their effects on Jupiter's decametric radio emissions Open
<p>Interplanetary shocks cause large and abrupt changes in solar wind plasma and magnetic field parameters. Shock occurrence and strength are dependent on the heliocentric distance. Further, shocks have important effects on planetary…
View article: Crustal magnetic field advection on Mars from MAVEN observations
Crustal magnetic field advection on Mars from MAVEN observations Open
<p>The plasma environment of Mars is highly influenced by regions of remnant magnetism in the planetary crust, above which mini-magnetospheres are created. In this work, we study whether the ionospheric plasma flow can move crustal m…