Chris Hall
YOU?
Author Swipe
View article: CLimate Impact: Determining Etiology thRough pAthways (CLDERA)
CLimate Impact: Determining Etiology thRough pAthways (CLDERA) Open
Climate impacts have broad economic, health, political, and national security ramifications. Societally relevant impacts are typically farther downstream, are the product of multiple interacting processes, and can arise over small regions …
View article: Elastic Changepoint Detection for Globally-indexed Functional Time Series Data with Climate Applications
Elastic Changepoint Detection for Globally-indexed Functional Time Series Data with Climate Applications Open
Changepoint detection is a vital tool in the application of climate data analysis. Numerous types of climate observation data are most properly represented by functional time series, implying a need for accurate changepoint detection metho…
View article: Long-term studies of mesosphere and lower-thermosphere summer length definitions based on mean zonal wind features observed for more than one solar cycle at middle and high latitudes in the Northern Hemisphere
Long-term studies of mesosphere and lower-thermosphere summer length definitions based on mean zonal wind features observed for more than one solar cycle at middle and high latitudes in the Northern Hemisphere Open
Specular meteor radars (SMRs) and partial reflection radars (PRRs) have been observing mesospheric winds for more than a solar cycle over Germany (∼ 54∘ N) and northern Norway (∼ 69∘ N). This work investigates the mesospheric mean zonal wi…
View article: Multistatic meteor radar observations to assess the spatial variability of mesospheric/lower thermospheric winds using a 3DVAR+div tomographic retrieval to measure spatially resolved 3D winds 
Multistatic meteor radar observations to assess the spatial variability of mesospheric/lower thermospheric winds using a 3DVAR+div tomographic retrieval to measure spatially resolved 3D winds  Open
<p>The middle atmospheric circulation is driven by atmospheric waves, which carry energy and momentum from their source to the area of their dissipation and thus providing an energetic coupling between different atmospheric layers. A…
View article: Atmospheric tomography using the Nordic Meteor Radar Cluster and Chilean Observation Network De Meteor Radars: network details and 3D-Var retrieval
Atmospheric tomography using the Nordic Meteor Radar Cluster and Chilean Observation Network De Meteor Radars: network details and 3D-Var retrieval Open
Ground-based remote sensing of atmospheric parameters is often limited to single station observations by vertical profiles at a certain geographic location. This is a limiting factor for investigating gravity wave dynamics as the spatial i…
View article: Long-term studies of MLT summer length definitions based on mean zonal wind features observed for more than one solar cycle at mid- and high-latitudes in the northern hemisphere
Long-term studies of MLT summer length definitions based on mean zonal wind features observed for more than one solar cycle at mid- and high-latitudes in the northern hemisphere Open
Specular meteor radars (SMRs) and partial reflection radars (PRRs) have been observing mesospheric winds for more than a solar cycle over Germany (~54 °N) and northern Norway (~69 °N). This work investigates the mesospheric mean zonal wind…
View article: Comment on amt-2021-124
Comment on amt-2021-124 Open
Abstract. Ground-based remote sensing of atmospheric parameters is often limited to single station observations by vertical profiles at a certain geographic location. This is a limiting factor for investigating gravity wave dynamics as the…
View article: Meteor radar observations of polar mesospheric summer echoes over Svalbard
Meteor radar observations of polar mesospheric summer echoes over Svalbard Open
A 31 MHz meteor radar located in Svalbard was used to observe polar mesospheric echoes (PMSEs) during summer 2020. Data from 19 July were selected for detailed analysis, with a focus on extracting additional information to characterize the…
View article: Reply on AC1
Reply on AC1 Open
Abstract. Ground-based remote sensing of atmospheric parameters is often limited to single station observations by vertical profiles at a certain geographic location. This is a limiting factor for investigating gravity wave dynamics as the…
View article: Comment on amt-2021-124: On vertical velocity estimates
Comment on amt-2021-124: On vertical velocity estimates Open
Abstract. Ground-based remote sensing of atmospheric parameters is often limited to single station observations by vertical profiles at a certain geographic location. This is a limiting factor for investigating gravity wave dynamics as the…
View article: Atmospheric tomography using the Nordic Meteor Radar Clusterand Chilean Observation Network De Meteor Radars: networkdetails and 3DVAR retrieval
Atmospheric tomography using the Nordic Meteor Radar Clusterand Chilean Observation Network De Meteor Radars: networkdetails and 3DVAR retrieval Open
Ground-based remote sensing of atmospheric parameters is often limited to single station observations of vertical profiles at a certain geographic location. This can be a limiting factor to investigating gravity wave dynamics. In this stud…
View article: Comment on amt-2021-14
Comment on amt-2021-14 Open
Abstract. A 31âMHz meteor radar located in Svalbard was used to observe polar mesospheric echoes (PMSEs) during summer 2020. Data from 19Â July were selected for detailed analysis, with a focus on extracting additional information to cha…
View article: Meteor radar observations of polar mesospheric summer echoesover Svalbard
Meteor radar observations of polar mesospheric summer echoesover Svalbard Open
A 31 MHz meteor radar located in Svalbard has been used to observe polar mesospheric echoes (PMSE) during summer 2020. Data from 19 July was selected for detailed analysis, with a focus on extracting additional information to characterize …
View article: On the correction of temperatures derived from meteor wind radars due to geomagnetic activity
On the correction of temperatures derived from meteor wind radars due to geomagnetic activity Open
Radars used to observe meteor trails in the mesosphere deliver information on winds and temperature. Use of these radars is becoming a standard method for determining mesospheric dynamics and temperatures worldwide due to relatively low co…
View article: On the temporal evolution of turbopause altitude, 1996–2021, 70°N, 19°E
On the temporal evolution of turbopause altitude, 1996–2021, 70°N, 19°E Open
Medium frequency radars with multiple receivers are able to track the movement of the interference pattern on the ground from echoes from irregularities in refractive index. In particular, refractive index in the mesosphere is determined b…
View article: Migrating Semidiurnal Tide During the September Equinox Transition in the Northern Hemisphere
Migrating Semidiurnal Tide During the September Equinox Transition in the Northern Hemisphere Open
Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere‐ionosphere eXtension simulations are used to investigate the solar migrating semidiurnal tide (SW2) around September equinox at middle to high latitudes in the N…
View article: A ground-based instrument suite for integrated high-time resolution measurements of pulsating aurora with Arase
A ground-based instrument suite for integrated high-time resolution measurements of pulsating aurora with Arase Open
A specialized ground-based system has been developed for simultaneous observations of pulsating aurora (PsA) and related magnetospheric phenomena with the Arase satellite. The instrument suite is composed of 1) six 100-Hz sampling high-spe…
View article: Zonal Wave Number Diagnosis of Rossby Wave‐Like Oscillations Using Paired Ground‐Based Radars
Zonal Wave Number Diagnosis of Rossby Wave‐Like Oscillations Using Paired Ground‐Based Radars Open
Free traveling Rossby wave normal modes (RNMs) are often investigated through large‐scale space‐time spectral analyses, which therefore is subject to observational availability, especially in the mesosphere. Ground‐based mesospheric observ…
View article: Resolving spatial dynamics at polar latitudes using the GROMOS-C radiometer on Svalbard and the Nordic meteor radar cluster
Resolving spatial dynamics at polar latitudes using the GROMOS-C radiometer on Svalbard and the Nordic meteor radar cluster Open
<p>The middle polar atmosphere dynamics is driven by atmospheric waves from the planetary scale to small scale perturbation due to gravity waves. The different atmospheric waves are characterized by their temporal and spatial variabi…
View article: On the relation between ionospheric parameters and sunspot number – ERRATUM
On the relation between ionospheric parameters and sunspot number – ERRATUM Open
An abstract is not available for this content. As you have access to this content, full HTML content is provided on this page. A PDF of this content is also available in through the ‘Save PDF’ action button.
View article: On the relation between ionospheric parameters and sunspot number
On the relation between ionospheric parameters and sunspot number Open
In a recent study, mid-latitude ionospheric parameters were compared with solar activity; it was suggested that the relationship between these, earlier assumed stable, might be changing with time (Lastovicka, 2019). Here, the information i…
View article: First observations of Polar Mesospheric Echoes at both 31 MHz and 53.5 MHz over Svalbard (78.2°N 15.1°E)
First observations of Polar Mesospheric Echoes at both 31 MHz and 53.5 MHz over Svalbard (78.2°N 15.1°E) Open
During summer 2020, observations of the mesosphere using a 53.5 MHz radar on Svalbard, at 78.2°N 15.1°E, revealed the well-known Polar Mesospheric Summer Echoes (PMSE). At the same time, a co-located meteor detection radar, operating at 31…
View article: Four‐Dimensional Quantification of Kelvin‐Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging
Four‐Dimensional Quantification of Kelvin‐Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging Open
We present and characterize in time and three spatial dimensions a Kelvin‐Helmholtz Instability (KHI) event from polar mesospheric summer echoes (PMSE) observed with the Middle Atmosphere Alomar Radar System. We use a newly developed radar…
View article: Possible influence of variations in the geomagnetic field on migration paths of snow buntings
Possible influence of variations in the geomagnetic field on migration paths of snow buntings Open
A hypothesis is proposed wherein changes in the Earth's magnetic field affect the migratory paths of snow buntings ( Plectrophenax nivalis ), and in particular from wintering grounds in the Russian/Ukrainian steppes to breeding grounds on …
View article: Climatology of the mesopause relative density using a global distribution of meteor radars
Climatology of the mesopause relative density using a global distribution of meteor radars Open
The existing distribution of meteor radars located from high- to low-latitude regions provides a favorable temporal and spatial coverage for investigating the climatology of the global mesopause density. In this study, we report the climat…
View article: A new five-wavelength photometer operated in Tromsø (69.6°N, 19.2°E)
A new five-wavelength photometer operated in Tromsø (69.6°N, 19.2°E) Open
A new fve-wavelength photometer was developed and installed at the EISCAT Tromsø site (69.6°N, 19.2°E) in January\n2017. The photometer consists of two units: an optical unit and a control unit together with a PC. The photometer is\ncapabl…
View article: Issue Information
Issue Information Open
No abstract is available for this article.