Comparison of a Neutral Density Model With the SET HASDM Density Database
Abstract The EXospheric TEMperatures on a PoLyhedrAl gRid (EXTEMPLAR) method predicts the neutral densities in the thermosphere. The performance of this model has been evaluated through a comparison with the Air Force High Accuracy Satellite Drag Model (HASDM). The Space Environment Technologies (SE...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-12-01
|
| Series: | Space Weather |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2021SW002888 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841536384766050304 |
|---|---|
| author | Daniel R. Weimer W. Kent Tobiska Piyush M. Mehta R. J. Licata Douglas P. Drob Jean Yoshii |
| author_facet | Daniel R. Weimer W. Kent Tobiska Piyush M. Mehta R. J. Licata Douglas P. Drob Jean Yoshii |
| author_sort | Daniel R. Weimer |
| collection | DOAJ |
| description | Abstract The EXospheric TEMperatures on a PoLyhedrAl gRid (EXTEMPLAR) method predicts the neutral densities in the thermosphere. The performance of this model has been evaluated through a comparison with the Air Force High Accuracy Satellite Drag Model (HASDM). The Space Environment Technologies (SET) HASDM database that was used for this test spans the 20 years 2000 through 2019, containing densities at 3 hr time intervals at 25 km altitude steps, and a spatial resolution of 10° latitude by 15° longitude. The upgraded EXTEMPLAR that was tested uses the newer Naval Research Laboratory MSIS 2.0 model to convert global exospheric temperature values to neutral density as a function of altitude. The revision also incorporated time delays that varied as a function of location, between the total Poynting flux in the polar regions and the exospheric temperature response. The density values from both models were integrated on spherical shells at altitudes ranging from 200 to 800 km. These sums were compared as a function of time. The results show an excellent agreement at temporal scales ranging from hours to years. The EXTEMPLAR model performs best at altitudes of 400 km and above, where geomagnetic storms produce the largest relative changes in neutral density. In addition to providing an effective method to compare models that have very different spatial resolutions, the use of density totals at various altitudes presents a useful illustration of how the thermosphere behaves at different altitudes, on time scales ranging from hours to complete solar cycles. |
| format | Article |
| id | doaj-art-161f3f1414b84154b4ca57a4a571ef4f |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2021-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-161f3f1414b84154b4ca57a4a571ef4f2025-01-14T16:27:22ZengWileySpace Weather1542-73902021-12-011912n/an/a10.1029/2021SW002888Comparison of a Neutral Density Model With the SET HASDM Density DatabaseDaniel R. Weimer0W. Kent Tobiska1Piyush M. Mehta2R. J. Licata3Douglas P. Drob4Jean Yoshii5Center for Space Science and Engineering Research Virginia Tech Blacksburg VA USASpace Environment Technologies Los Angeles CA USADepartment of Mechanical and Aerospace Engineering Statler College of Engineering and Mineral Resources West Virginia University Morgantown WV USADepartment of Mechanical and Aerospace Engineering Statler College of Engineering and Mineral Resources West Virginia University Morgantown WV USASpace Science Division U.S. Naval Research Laboratory Washington DC USASpace Environment Technologies Los Angeles CA USAAbstract The EXospheric TEMperatures on a PoLyhedrAl gRid (EXTEMPLAR) method predicts the neutral densities in the thermosphere. The performance of this model has been evaluated through a comparison with the Air Force High Accuracy Satellite Drag Model (HASDM). The Space Environment Technologies (SET) HASDM database that was used for this test spans the 20 years 2000 through 2019, containing densities at 3 hr time intervals at 25 km altitude steps, and a spatial resolution of 10° latitude by 15° longitude. The upgraded EXTEMPLAR that was tested uses the newer Naval Research Laboratory MSIS 2.0 model to convert global exospheric temperature values to neutral density as a function of altitude. The revision also incorporated time delays that varied as a function of location, between the total Poynting flux in the polar regions and the exospheric temperature response. The density values from both models were integrated on spherical shells at altitudes ranging from 200 to 800 km. These sums were compared as a function of time. The results show an excellent agreement at temporal scales ranging from hours to years. The EXTEMPLAR model performs best at altitudes of 400 km and above, where geomagnetic storms produce the largest relative changes in neutral density. In addition to providing an effective method to compare models that have very different spatial resolutions, the use of density totals at various altitudes presents a useful illustration of how the thermosphere behaves at different altitudes, on time scales ranging from hours to complete solar cycles.https://doi.org/10.1029/2021SW002888space weatherthermospheremodelsforecastingsatellite drag |
| spellingShingle | Daniel R. Weimer W. Kent Tobiska Piyush M. Mehta R. J. Licata Douglas P. Drob Jean Yoshii Comparison of a Neutral Density Model With the SET HASDM Density Database Space Weather space weather thermosphere models forecasting satellite drag |
| title | Comparison of a Neutral Density Model With the SET HASDM Density Database |
| title_full | Comparison of a Neutral Density Model With the SET HASDM Density Database |
| title_fullStr | Comparison of a Neutral Density Model With the SET HASDM Density Database |
| title_full_unstemmed | Comparison of a Neutral Density Model With the SET HASDM Density Database |
| title_short | Comparison of a Neutral Density Model With the SET HASDM Density Database |
| title_sort | comparison of a neutral density model with the set hasdm density database |
| topic | space weather thermosphere models forecasting satellite drag |
| url | https://doi.org/10.1029/2021SW002888 |
| work_keys_str_mv | AT danielrweimer comparisonofaneutraldensitymodelwiththesethasdmdensitydatabase AT wkenttobiska comparisonofaneutraldensitymodelwiththesethasdmdensitydatabase AT piyushmmehta comparisonofaneutraldensitymodelwiththesethasdmdensitydatabase AT rjlicata comparisonofaneutraldensitymodelwiththesethasdmdensitydatabase AT douglaspdrob comparisonofaneutraldensitymodelwiththesethasdmdensitydatabase AT jeanyoshii comparisonofaneutraldensitymodelwiththesethasdmdensitydatabase |