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Filtering by: Creator Wang, Zihan Remove constraint Creator: Wang, Zihan Discipline Science Remove constraint Discipline: Science

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  • VISTA TEC Database (ver 2.0)

    work
    Creator:
    Sun, Hu, Ren, Jiaen, Chen, Yang, Zou, Shasha, Chang, Yurui, Wang, Zihan, and Coster, Anthea
    Description:
    Our research focuses on providing a fully-imputed map of the worldwide total electron content with high resolution and spatial-temporal smoothness. We fill in the missing values of the original Madrigal TEC maps via estimating the latent feature of each latitude and local time along the 2-D grid and give initial guess of the missing regions based on pre-computed spherical harmonics map. The resulting TEC map has high imputation accuracy and the ease of reproducing. All data are in HDF5 format and are easy to read using the h5py package in Python. The TEC map is grouped in folders based on years and each file contains a single-day data of 5-min cadence. Each individual TEC map is of size 181*361. and WARNING: 2023-12-01 the data file for 2019-Jan-03 has badly fitted values. Please avoid using it. All other days' files are ready to use.
    Keyword:
    Total Electron Content, Matrix Completion, VISTA, Spherical Harmonics, and Spatial-Temporal Smoothing
    Citation to related publication:
    Sun, H., Hua, Z., Ren, J., Zou, S., Sun, Y., & Chen, Y. (2022). Matrix completion methods for the total electron content video reconstruction. The Annals of Applied Statistics, 16(3), 1333-1358., Sun, H., Chen, Y., Zou, S., Ren, J., Chang, Y., Wang, Z., & Coster, A. (2023). Complete Global Total Electron Content Map Dataset based on a Video Imputation Algorithm VISTA. Scientific Data, in press., and Zou, S., Ren, J., Wang, Z., Sun, H., & Chen, Y. (2021). Impact of storm-enhanced density (SED) on ion upflow fluxes during geomagnetic storm. Frontiers in Astronomy and Space Sciences, 8, 746429.
    Discipline:
    Science and Engineering

  • RAINBOW All Sky Imager data

    work
    Creator:
    Liang, Jun and Wang, Zihan
    Description:
    The aim of the research to study the temporal evolution of the Sub-Auroral Polarizations Streams (SAPS) with multiple instruments. Aurora images are important to identify the electrodynamics in the high latitude ionosphere. Data used in this research were collected and provided by Dr. Jun Liang at University of Calgary, and analyzed by Zihan Wang for the article accompanying this deposit. The data was collected from all sky imagers (ASI) located in Saskatoon, Canada. and saskrainbow01.sav contains the rgb channels from ASI. It can be opened using IDL. saskasiskymap.gm5 contains the sky map of the ASI. It shows the geographic location of the figure pixels. aurora_diff.pro is the procedure to recover the data from saskrainbow01.sav and make plots. draw_colorbar.pro is the procedure to add a colorbar to the plot. mlon_smp_towang.pro and rebinsmpkeo_towang.pro can together make keogram plots. Run mlon_smp_towang.pro first and then rebinsmpkeo_towang.pro.
    Keyword:
    All Sky Imager
    Citation to related publication:
    Wang, Z., Zou, S., Shepherd, S. G., Liang, J., Gjerloev, J. W., Ruohoniemi, J. M., et al. ( 2019). Multi‐instrument observations of mesoscale enhancement of subauroral polarization stream associated with an injection.Journal of Geophysical Research: Space Physics, 124, 1770– 1784.  https://doi.org/10.1029/2019JA026535
    Discipline:
    Science

  • Space Weather Modeling Framework (SWMF) Simulation of Sep 7 2017 Geomagnetic Storm

    work
    Creator:
    Wang, Zihan
    Description:
    SWMF is used to study the segmentation of SED plume into polar cap patches during the geomagnetic storm on Sep 7, 2017. The database includes the 3D output in the upper atmosphere from GITM, the 2D output from Ionospheric Electrodynamics (IE) and 3D output from BATSRUS. The output from GITM can be read with thermo_batch_new.pro. The output from IE can be opened with Spacepy at  https://pythonhosted.org/SpacePy/. The output from BATSRUS can be opened with tecplot. More details can be found in Readme.txt.
    Keyword:
    MHD and Ionosphere
    Citation to related publication:
    Wang, Z., Zou, S., Coppeans, T., Ren, J., Ridley, A., & Gombosi, T. (2019). Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring current. Geophysical Research Letters, 46(14), 7920–7928.  https://doi.org/10.1029/2019GL084041
    Discipline:
    Science