M. Lester
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View article: Supplementary material to "High-latitude MSTIDs over the EISCAT-3D site: Solar activity and seasonal dependency"
Supplementary material to "High-latitude MSTIDs over the EISCAT-3D site: Solar activity and seasonal dependency" Open
View article: High-latitude MSTIDs over the EISCAT-3D site: Solar activity and seasonal dependency
High-latitude MSTIDs over the EISCAT-3D site: Solar activity and seasonal dependency Open
This work involves an investigation of high-latitude medium scale traveling ionospheric disturbances (MSTIDs) over the newly established EISCAT-3D radar site. We have used the ground backscatter data from an HF radar located at Hankasalmi,…
View article: Statistical Analysis of Multiple Bow Shock Crossings at Mars
Statistical Analysis of Multiple Bow Shock Crossings at Mars Open
We conduct a statistical analysis of multiple bow shock (BS) crossings at Mars. Data from the magnetometer (MAG) and Solar Wind Ion Analyzer (SWIA) onboard the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft from its first 2 year…
View article: New insights into the polar ozone and water vapor, radiative effects, and their connection to the tides in the mesosphere–lower thermosphere during major sudden stratospheric warming events
New insights into the polar ozone and water vapor, radiative effects, and their connection to the tides in the mesosphere–lower thermosphere during major sudden stratospheric warming events Open
We examine the variability of diurnal tide (DT), semidiurnal tide (SDT), and terdiurnal tide (TDT) amplitudes in the Arctic mesosphere and lower thermosphere (MLT) during and after sudden stratospheric warming (SSW) events using meteor rad…
View article: TIMED Doppler Interferometer measurements of neutral winds at the mesosphere and lower thermosphere and comparison to meteor radar winds
TIMED Doppler Interferometer measurements of neutral winds at the mesosphere and lower thermosphere and comparison to meteor radar winds Open
The mesosphere and lower thermosphere (MLT) comprise a highly variable region that forms the transition region between the middle and upper atmosphere. The variability of this region is driven by atmospheric waves transporting energy and m…
View article: The response of the Martian ionosphere to short and long term solar energetic particles, a scientifc goal of the ESA M7 candidate M-MATISSE
The response of the Martian ionosphere to short and long term solar energetic particles, a scientifc goal of the ESA M7 candidate M-MATISSE Open
The response of the Martian environment to Space Weather activity is not yet very well characterised as many factors from both the planet and from outside play large roles in the observed dynamics, particularly in the ionosphere. One of th…
View article: Escaping plasma structures in the Martian magnetotail as observed during two special MARSIS high-altitude campaigns
Escaping plasma structures in the Martian magnetotail as observed during two special MARSIS high-altitude campaigns Open
The nightside ionosphere of Mars is formed by plasma transport from the dayside and electron precipitation. Significant progress has been made in our understanding of its composition and structure at low altitudes. However, what happens at…
View article: The Ionopause at Mars and Its Correlation With Magnetic Topology and Plasma Pressure
The Ionopause at Mars and Its Correlation With Magnetic Topology and Plasma Pressure Open
We utilize Mars Atmosphere and Volatile Evolution (MAVEN) observations to investigate the ionopause boundary at Mars, the formation process of which is not yet well described. We focus on the eighth deep dip campaign (DD8), which consists …
View article: Effects of the 2018 Martian Global Dust Storm on Boundary Positions in the Induced Magnetosphere
Effects of the 2018 Martian Global Dust Storm on Boundary Positions in the Induced Magnetosphere Open
Global dust storms at Mars have a significant impact on the atmosphere and ionosphere, but only recently has their impact on the magnetosphere been investigated. The 2018 global dust storm at Mars was the first global event following the a…
View article: The Role of the Magnetic Field Orientation on the Variability of the Martian Topside Ionosphere Using MARSIS‐Mars Express Data
The Role of the Magnetic Field Orientation on the Variability of the Martian Topside Ionosphere Using MARSIS‐Mars Express Data Open
Mars, without a global dipole magnetic field, has its atmosphere directly exposed to the impinging solar wind, producing a complex interaction due to the remnant crustal magnetic fields, which, especially in the southern hemisphere, have s…
View article: Spacecraft Discharge Time Constants Determined From Electron‐Flux Suppression During Sounding‐Radar Operation at Mars
Spacecraft Discharge Time Constants Determined From Electron‐Flux Suppression During Sounding‐Radar Operation at Mars Open
Spacecraft discharge time constants are calculated from measurements of electron differential flux before and during operation of an ionospheric sounding radar. Determining these time constants provides insight into how the operation of a …
View article: Cluster Observations of Plasma in the High Latitude Magnetotail Associated With Cusp‐Aligned Arcs
Cluster Observations of Plasma in the High Latitude Magnetotail Associated With Cusp‐Aligned Arcs Open
During periods of northward interplanetary magnetic field (IMF), the magnetospheric structure and dynamics are dramatically different compared to the southward IMF case. Previous studies using both observations and simulations have shown t…
View article: Atmospheric Gravity Waves and Medium Scale Traveling Ionospheric Disturbances at Auroral Latitudes
Atmospheric Gravity Waves and Medium Scale Traveling Ionospheric Disturbances at Auroral Latitudes Open
To investigate physical links between the Earth atmosphere and ionosphere, we present data of the medium-scale atmospheric gravity waves (AGWs, periods 25–100 min) observed at auroral latitudes. The AGWs at 80–100 km altitude were inferred…
View article: Mars Express investigations of the Martian ionosphere using ASPERA-3 and new MARSIS fixed frequency modes
Mars Express investigations of the Martian ionosphere using ASPERA-3 and new MARSIS fixed frequency modes Open
View article: Reliability of Matching AMPERE Field‐Aligned Current Boundaries With SuperDARN Lower Latitude Ionospheric Convection Boundaries During Geomagnetic Storms
Reliability of Matching AMPERE Field‐Aligned Current Boundaries With SuperDARN Lower Latitude Ionospheric Convection Boundaries During Geomagnetic Storms Open
High‐latitude ionospheric convection is a useful diagnostic of solar wind‐magnetosphere interactions and nightside activity in the magnetotail. For decades, the high‐latitude convection pattern has been mapped using the Super Dual Auroral …
View article: Retrieval of mesospheric temperature from meteor radar and comparison with TIMED/SABER observation
Retrieval of mesospheric temperature from meteor radar and comparison with TIMED/SABER observation Open
Unlike other ground-based optical instruments that are affected by weather conditions, a meteor radar (MR) has the capability of monitoring mesospheric temperature continuously. However, to date, lack of reliable temperature measurements h…
View article: A convolutional neural network for analysis of active ionospheric sounding data from the Mars Express MARSIS instrument
A convolutional neural network for analysis of active ionospheric sounding data from the Mars Express MARSIS instrument Open
We present a method for the automatic classification of ionograms using a convolutional neural network which can detect the ionospheric trace. The ionograms are from the Mars Advanced Radar for Sub-surface and Ionosphere Sounding (MARSIS) …
View article: New insights into the polar ozone and water vapor, radiative effects, and their connection to the tides in the mesosphere-lower thermosphere during major Sudden Stratospheric Warming events
New insights into the polar ozone and water vapor, radiative effects, and their connection to the tides in the mesosphere-lower thermosphere during major Sudden Stratospheric Warming events Open
We examine the variability of diurnal (DT), semidiurnal (SDT), and terdiurnal (TDT) tide amplitudes in the Arctic mesosphere and lower thermosphere (MLT) during and after sudden stratospheric warming (SSW) events using meteor radar data at…
View article: Spacecraft Discharge Time Constants Determined from Electron-Flux Suppression during Sounding-Radar Operation at Mars
Spacecraft Discharge Time Constants Determined from Electron-Flux Suppression during Sounding-Radar Operation at Mars Open
View article: Seasonal and Local Time Variation in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars
Seasonal and Local Time Variation in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars Open
Meteoroids of sub‐milligram sizes burn up high in the Earth's atmosphere and cause streaks of plasma trails detectable by meteor radars. The altitude at which these trails, or meteors, form depends on a number of factors including atmosphe…
View article: Extent of the Magnetotail of Venus From the Solar Orbiter, Parker Solar Probe and BepiColombo Flybys
Extent of the Magnetotail of Venus From the Solar Orbiter, Parker Solar Probe and BepiColombo Flybys Open
We analyze data from multiple flybys by the Solar Orbiter, BepiColombo, and Parker Solar Probe (PSP) missions to study the interaction between Venus' plasma environment and the solar wind forming the induced magnetosphere. Through examinat…
View article: Reliability of Matching AMPERE Field-Aligned Current Boundaries with SuperDARN Lower Latitude Ionospheric Convection Boundaries During Geomagnetic Storms
Reliability of Matching AMPERE Field-Aligned Current Boundaries with SuperDARN Lower Latitude Ionospheric Convection Boundaries During Geomagnetic Storms Open
View article: TIMED Doppler Interferometer Measurements of Neutral Winds at the Mesosphere and Lower Thermosphere and Comparison to Meteor Radar Winds
TIMED Doppler Interferometer Measurements of Neutral Winds at the Mesosphere and Lower Thermosphere and Comparison to Meteor Radar Winds Open
The mesosphere and lower thermosphere (MLT) is a highly variable region that forms the transition region between middle and upper atmosphere. The variability of this region is driven by atmospheric waves transporting energy and momentum fr…
View article: The role of magnetic topology and plasma pressure on the ionopause formation at Mars
The role of magnetic topology and plasma pressure on the ionopause formation at Mars Open
At planets with no intrinsic dipolar magnetic field such as Mars, an ionopause is often formed, a boundary that separates the planetary plasma from the solar wind. The ionopause boundary and its formation drivers in the upper dayside ionos…
View article: Web-based Fund Collections System
Web-based Fund Collections System Open
This system streamlines parts of the manual process of receiving client payments in a military organization's Accounting and Finance offices in one of the Municipalities of the province of Zamboanga del Sur, Philippines. The current system…
View article: Effects of the 2007 Martian Global Dust Storm on Boundary Positions in the Induced Magnetosphere
Effects of the 2007 Martian Global Dust Storm on Boundary Positions in the Induced Magnetosphere Open
Mars's magnetosphere is a sensitive system, varying due to external and internal factors, such as solar wind conditions and crustal magnetic fields. A signature of this influence can be seen in the position of two boundaries; the bow shock…
View article: The Ionosphere of Mars After 20 Years of Mars Express Contributions
The Ionosphere of Mars After 20 Years of Mars Express Contributions Open
View article: Discrete aurora and the nightside ionosphere of Mars: an EMM–MEX conjunction of FUV imaging, ionospheric radar sounding, and suprathermal electron measurements
Discrete aurora and the nightside ionosphere of Mars: an EMM–MEX conjunction of FUV imaging, ionospheric radar sounding, and suprathermal electron measurements Open
Since 2021, a new surge in discrete aurora detections at Mars has been observed by the Emirates Mars Ultraviolet Spectrometer (EMUS) onboard the Emirates Mars Mission (EMM) Hope Orbiter as EMUS started to regularly obtain synoptic auroral …
View article: Gravity waves generated by the Hunga Tonga–Hunga Ha′apai volcanic eruption and their global propagation in the mesosphere/lower thermosphere observed by meteor radars and modeled with the High-Altitude general Mechanistic Circulation Model
Gravity waves generated by the Hunga Tonga–Hunga Ha′apai volcanic eruption and their global propagation in the mesosphere/lower thermosphere observed by meteor radars and modeled with the High-Altitude general Mechanistic Circulation Model Open
The Hunga Tonga–Hunga Ha′apai volcano erupted on 15 January 2022, launching Lamb waves and gravity waves into the atmosphere. In this study, we present results using 13 globally distributed meteor radars and identify the volcanogenic gravi…
View article: Effective mass function of radio meteoroids as a modulating factor in determining atmospheric scale height
Effective mass function of radio meteoroids as a modulating factor in determining atmospheric scale height Open
A long-standing problem in meteor science has been the persistent presence of bias in the measured value of atmospheric scale heights obtained from radio meteor echoes. A common practice of fitting a linear function for bias correction fol…