Identification

Title

3‐D regional ionosphere imaging and SED reconstruction with a new TEC‐based Ionospheric Data Assimilation System (TIDAS)

Abstract

A new TEC-based ionospheric data assimilation system (TIDAS) over the continental US and adjacent area (20 degrees-60 degrees N, 60 degrees-130 degrees W, and 100-600 km) has been developed through assimilating heterogeneous ionospheric data, including dense ground-based Global Navigation Satellite System (GNSS) Total Electron Content (TEC) from 2,000+ receivers, Constellation Observing System for Meteorology, Ionosphere, and Climate radio occultation data, JASON satellite altimeter TEC, and Millstone Hill incoherent scatter radar measurements. A hybrid Ensemble-Variational scheme is utilized to reconstruct the regional 3-D electron density distribution: a more realistic and location-dependent background error covariance matrix is calculated from an ensemble of corrected NeQuick outputs, and a three-dimensional variational (3DVAR) method is adopted for measurement updates to obtain an optimal state estimation. The spatial-temporal resolution of the reanalyzed 3-D electron density product is as high as 1 degrees x 1 degrees in latitude and longitude, 20 km in altitude, and 5 min in universal time, which is sufficient to reproduce ionospheric fine structure and storm-time disturbances. The accuracy and reliability of data assimilation results are validated using ionosonde and other measurements. TIDAS reanalyzed electron density is able to successfully reconstruct the 3-D morphology and dynamic evolution of the storm-enhanced density (SED) plume observed during the St. Patrick's day geomagnetic storm on 17 March 2013 with high fidelity. Using TIDAS, we found that the 3-D SED plume manifests as a ridge-like high-density channel that predominantly occurred between 300 and 500 km during 19:00-21:00 UT for this event, with the F2 region peak height being raised by 40-60 km and peak density enhancement of 30%-50%.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7pn9975

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2022-04-01T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact