J. J. Sojka
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View article: High Quality Image Compression for Rockets and Satellites
High Quality Image Compression for Rockets and Satellites Open
Installed communication systems for the more recent imagery rockets and satellites generally do not have sufficient data link bandwidth to allow imagery transmission. High quality image compression can alleviate this problem since 5 to 10 …
View article: Data sets for "On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector" by Wright et al.
Data sets for "On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector" by Wright et al. Open
Copy of data described in 'On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector' by Wright et. a…
View article: Data sets for "On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector" by Wright et al.
Data sets for "On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector" by Wright et al. Open
Copy of data described in 'On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector' by Wright et. a…
View article: On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector
On the detection of a solar radio burst event that occurred on 28 August 2022 and its effect on GNSS signals as observed by ionospheric scintillation monitors distributed over the American sector Open
As part of an effort to observe and study ionospheric disturbances and their effects on radio signals used by Global Navigation Satellite Systems (GNSS), alternative low-cost GNSS-based ionospheric scintillation and total electron content …
View article: TDIM ionospheric model TEC, hmF2, and NmF2 at mid-latitude northern hemisphere, used in the paper titled "Is TEC a Viable Servo Input?"
TDIM ionospheric model TEC, hmF2, and NmF2 at mid-latitude northern hemisphere, used in the paper titled "Is TEC a Viable Servo Input?" Open
The externally imposed vertical drift in the F region is an extremely important driver of ionospheric dynamics but is very difficult to measure or map. Ionospheric servo algorithms have used hmF2 as F-region observable to infer the vertica…
View article: Model‐Based Properties of the Dayside Open/Closed Boundary: Is There a UT‐Dependent Variation?
Model‐Based Properties of the Dayside Open/Closed Boundary: Is There a UT‐Dependent Variation? Open
The open‐closed boundary (OCB) defines a region of significant transformation in Earth's protective magnetic shield. Principle among these changes is the transition of magnetic field lines from having two foot points, one in each hemispher…
View article: Principles Of Heliophysics: a textbook on the universal processes behind planetary habitability
Principles Of Heliophysics: a textbook on the universal processes behind planetary habitability Open
Heliophysics is the system science of the physical connections between the Sun and the solar system. As the physics of the local cosmos, it embraces space weather and planetary habitability. The wider view of comparative heliophysics forms…
View article: Hemispherical Shifted Symmetry in Polar Cap Patch Occurrence: A Survey of GPS TEC Maps From 2015–2018
Hemispherical Shifted Symmetry in Polar Cap Patch Occurrence: A Survey of GPS TEC Maps From 2015–2018 Open
Much theoretical and observational work has been devoted to studying the occurrence of F region polar cap patches in the Northern Hemisphere; considerably less work has been applied to the Southern Hemisphere. In recent years, the Madrigal…
View article: TDIM ionospheric model TEC maps of the high-latitude northern hemisphere, used in the paper titled "Hemispherical Shifted Symmetry in Polar Cap F-Region Patch Occurrence: A Survey of GPS TEC data from 2015 to 2018"
TDIM ionospheric model TEC maps of the high-latitude northern hemisphere, used in the paper titled "Hemispherical Shifted Symmetry in Polar Cap F-Region Patch Occurrence: A Survey of GPS TEC data from 2015 to 2018" Open
TDIM ionospheric model was run for the year 2018 at 10-day intervals and 2-hr intervals in UT.
View article: Madrigal GPS-TEC maps of the high-latitude northern hemisphere 2009-2017.
Madrigal GPS-TEC maps of the high-latitude northern hemisphere 2009-2017. Open
Raw data obtained from the Madrigal web site cedar.openmadrigal.org has been recast into a format of dial grids in geo-magnetic coordinates.
View article: Validation of Ionospheric Specifications During Geomagnetic Storms: TEC and foF2 During the 2013 March Storm Event
Validation of Ionospheric Specifications During Geomagnetic Storms: TEC and foF2 During the 2013 March Storm Event Open
To address challenges of assessing space weather modeling capabilities, the Community Coordinated Modeling Center is leading a newly established International Forum for Space Weather Modeling Capabilities Assessment . This paper presents p…
View article: Polar Topside Ionosphere During Geomagnetic Storms: Comparison of ISIS‐II With TDIM
Polar Topside Ionosphere During Geomagnetic Storms: Comparison of ISIS‐II With TDIM Open
Space weather deposits energy into the high polar latitudes, primarily via Joule heating that is associated with the Poynting flux electromagnetic energy flow between the magnetosphere and ionosphere. One way to observe this energy flow is…
View article: Life Beyond the Solar System: Space Weather and Its Impact on Habitable Worlds
Life Beyond the Solar System: Space Weather and Its Impact on Habitable Worlds Open
The search of life in the Universe is a fundamental problem of astrobiology and a major priority for NASA. A key area of major progress since the NASA Astrobiology Strategy 2015 (NAS15) has been a shift from the exoplanet discovery phase t…
View article: CEDAR‐GEM Challenge for Systematic Assessment of Ionosphere/Thermosphere Models in Predicting TEC During the 2006 December Storm Event
CEDAR‐GEM Challenge for Systematic Assessment of Ionosphere/Thermosphere Models in Predicting TEC During the 2006 December Storm Event Open
In order to assess current modeling capability of reproducing storm impacts on total electron content (TEC), we considered quantities such as TEC, TEC changes compared to quiet time values, and the maximum value of the TEC and TEC changes …
View article: How Hospitable Are Space Weather Affected Habitable Zones? The Role of Ion Escape
How Hospitable Are Space Weather Affected Habitable Zones? The Role of Ion Escape Open
Atmospheres of exoplanets in the habitable zones around active young G-K-M stars are subject to extreme X-ray and EUV (XUV) fluxes from their host stars that can initiate atmospheric erosion. Atmospheric loss affects exoplanetary habitabil…
View article: Space weather forecasting with a Multimodel Ensemble Prediction System (MEPS)
Space weather forecasting with a Multimodel Ensemble Prediction System (MEPS) Open
The goal of the Multimodel Ensemble Prediction System (MEPS) program is to improve space weather specification and forecasting with ensemble modeling. Space weather can have detrimental effects on a variety of civilian and military systems…
View article: Polar cap patches and the tongue of ionization: A survey of GPS TEC maps from 2009 to 2015
Polar cap patches and the tongue of ionization: A survey of GPS TEC maps from 2009 to 2015 Open
The source and structuring mechanisms for F region density patches have been subjects of speculation and debate for many years. We have made a survey of mappings of total electron content (TEC) between the years 2009 and 2015 from the web‐…