Recent progress of WDC for Geophysics, Beijing Xiukuan Zhao, Baiqi Ning, Lianhuan Hu Institute of Geology and Geophysics, CAS

Outline Introduction Real-time data Historical data Global cooperation Then I will talk about three aspects enhancing our database to sustain Earth Sciences researchers’ needs.

WDC for Geophysics, Beijing One of the nine discipline data centers in China joined WDC in 1988. Supported by Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS). Two main observation systems Space Environment Exploration System Seismic Array Observation System WDS Regular Membership just Approved The IGGCAS is one of the most important and well-known geosciences research institutions in China. Two main observation systems, Space Environment Exploration System and Seismic Array Observation System, which are the main data sources of WDC for Geophysics, Beijing.

Long-term, continuous observations Earliest ionospheric data in China since 1946 Earliest geomagnetic data in China since 1897 Earliest upper-atmosphere wind observations by Meteor Radar in China since 2002 GPS-TEC & Scintillation data Geomagnetic pulsations data Very high frequency (VHF) Radar data Seismic data Main features We focuses on a continuous observations of earth's space environment for obtaining relevant space environment parameters on the geomagnetic field, electrical field, electron density, wind field, temperature etc. in the upper atmosphere, ionosphere, magnetosphere.

Staff Members 17 Staff Members they are data management, geophysics or computing professionals.

WDC for Geophysics, Beijing GNSS ionospheric monitoring network Mohe observatory Data node of Meridian project Beijing observatory Data center of STERN Wuhan observatory National Science & Technology Infrastructure of China Sanya observatory Mirror site of madrigal database Arctic, Antarctic Mirror site of DIDBase/Driftbase GNSS network There are about 60 sites. These are cooperated with other institutes and universities. We owned four permanent Observatories. We also have multiple instruments in Arctic, Antarctic and Shaoyang. Solar-Terrestrial Environment Research Network (STERN), Chinese Academy of Sciences. Data Center for Geophysics, Data Sharing Infrastructure of Earth System Science, National Science & Technology Infrastructure of China  Observatories Data center

Observation Chain of IGGCAS Data Center in IGGCAS Four stations in a chain along 120°E meridian Beijing Station （40.3ºN ， 116.2ºE ） Mohe Station （53.5ºN 122.3ºE） 120 degree east longitude Zhongshan Station in Antarctic area. Yellow River Station in Arctic. Sanya Station （18.3ºN 109.6ºE） Wuhan Station （31.0ºN,114.5ºE） Zhongshan Station (69.4ºS 76.4ºE ) Yellow River Station (78.9ºN 11.9ºE )

Observation Instruments Magnetometer ( 4 x 6+6=30 set ) Meteor Radar ( 4 set ) Ionosonde ( 4+1 set ) GPS TEC and Scintillation ( 7 set ) VHF Radar ( 1 set ) GNSS ionospheric monitor( 20 set ) Incoherent Scatter Radar (incoming)

Seismic Array The Seismic Array Observation System is for array seismological experiments to collect seismic data of earthquakes and man-made sources. Seismic data processing system with international standard and data sharing policy are established correspondingly. For the real-time data, we

Historical ionospheric data Different record materials Manually created records (~10years) Photographic film records (~50years) Digitalized records (~20years) For the historical data, I want to take the Historical ionospheric data as an instance. The manually created records are one paper per hour. For the Photographic film records, we get one record every 15 minutes.

Process of photographic film records Scan Image Cut

Cut software Cut area Short cut Time Parameters Height h’F, foF2 （b）胶片频高图人工分割定标软件 单张频高图像，时间文件名，参数互校，刻度校正，数字定标 f=1 MHz, h=50 km Frequency

Ionogram image check （b）单张胶片频高图人工检查分析软件 观测时间，频率和高度刻度，foF2和h’F参数互校

Working scene

Digitalize the image *.bmp *.SBF Single file converting Multi files converting (d)SBF数字频高图的转化和度量分析软件 digital ionograms

Digital ionograms Image to digital ionogram with SBF format 保留了数字频高图描迹等各种信息，无极化信息

Totally 416 station year Manzhouli (13 years) Wakkanai (64 years) Urumchi (13 years) Changchun (13 years) Beijing (13 years) Kokubunji (55 years) Lanzhou (13 years) Yamagawa (49 years) Wuhan (61 years) Chongqing (13 years) Okinawa (42 years) Shaoyang (2 years) Taipei (23 years) Chung-Li (15 years) 完成16站电离层资料处理，形成数据集共计416站年 Guangzhou (13 years) Haikou (13 years)

Gallery of ionospheric parameters 电离层特性图集编研 Draw the gallery of these parameters, and also do some related researches.

Gallery of ionospheric parameters

Gallery of ionospheric parameters

Gallery of ionospheric parameters

Global cooperation data Madrigal database (global upper atmospheric science database by MIT Haystack Observatory) GIRO (Global Ionospheric Radio Observatory) database INTERMAGNET … 三种数据来源：每秒钟直接产生、转换历史、国际合作 WDC for Geophysics, Beijing hosts the mirror sites of Madrigal Database (http://madrigal.iggcas.ac.cn/) and DIDBase (http://www.epp.ac.cn/DIDBase.asp). The Madrigal Database is an upper atmospheric science database used by groups throughout the world and it is developed by the MIT Haystack Observatory. The DIDBase is created by the University of Massachusetts Lowell. It provides accurate specification of the electron density in the Earth's ionosphere at more than 60 locations in the world. GIRO data are opened for public access via DIDBase and DriftBase Web Portals The Beijing Ming Tombs station, which is owned by WDC for Geophysics, Beijing, is a standard permanent geomagnetic observation station and a member of International Real-time Magnetic Observatory Network ( Intermagnet ) .

Mirror site of Madrigal

Mirror site of GIRO Four digisondes of IGGCAS send data to UMLCAR ---- Cooperated with UMLCAR IGGCAS mirror site data exchange Public Public Internet Internet DPS4D Mohe DPS4D Beijing DPS4D Wuhan DPS4D Sanya Global Ionospheric Radio Observatory hold the largest ionosonde database. Cooperated with Umass Lowell, we send the DPS4D ionosonde data to GIRO server, and setup a mirror site of GIRO at Beijing. Four digisondes of IGGCAS send data to UMLCAR

Mohe Beijing Wuhan Sanya

Thank you for your attention! zxk@mail.iggcas.ac.cn