6. Facilities in the Data Center


6.1.  Data Storage

Data Center has a data storage room of 80 m2 which can store about  28,000 rolls of 
100ft microfilms, more than 6000 sheets of microfiches and 1890 rolls of digital 
magnetic tapes.  
Auroral particle data of NOAA and DMSP satellites are stored in optical disks (OD) 
in digital form.  These digital data in OD can be read out by using the host computer of 
the National Institute of Polar Research.  Two optical disk drivers and one laser beam 
printer of the host computer are also equipped in the Data Center.
Chart recording data and summary plots of the DMSP satellite auroral particle data 
are stored as image files in other type of optical disks, and can be displayed and 
printed out by using a document filing system. 
All-sky camera film data and Auroral TV VTR data can be stored on optical video 
disks (OVD) as a series of still video images.


6.2.  Hardwares

	   Reader Printer (for microfiche, 35 and 16 mm microfilms)
		FUJIX   FDIP6200

	   TSS Terminal of the Host-computer in the National Institute of Polar Research

	   Laser Beam Printer of the Host-computer  

	   Optical Disk Drives of the Host-computer  

	   Optical Disk Document Filing System  

	   Optical Video Disk Drivers for NTSC TV image data storage  
		TEAC   LV-250H ( 54000 TV pictures in one disk)
		TEAC   LV-210A (108000 TV pictures in one disk)

	   Film to Video converter  
		TOKKI   Film Analyzer

	   Auroral Image Processing System
		TOSHIBA   AS3260 (Sun-3/260 compatible)

	   Color Laser Printer FX Phaser 620J 
	

6.3.  Data Copy Forms

Copies of some of the archived data are available upon request and consultation 
with us according to our policy.  Forms are paper, CD, tapes, etc.


6.4.  Data Processing System in the Data Center

Figure 6-1 shows the Hardware System in the Data Center.  This System consists of 
the image data processing system, ARSAD (Automatic Retrieval System for Auroral Data), 
and the database management system, ADBASE (Auroral Data BASE).

(1)  ARSAD system

    ARSAD system consists of an optical video-disk (OVD) filing system for film data and 
a work station with digital image peripherals for recent image data and for the data 
processing.  Auroral images in 35mm films can be converted to video signals and stored 
on the OVD, automatically.  Auroral images in VTR tapes (NTSC format) can be also stored 
on the OVD.  These auroral video images can be digitized and transferred to the work 
station and then displayed on a graphic display with a pseudo-color scale.  One of the 
basic functions of the ARSAD system is to expand the auroral images on an ionospheric 
geomagnetic coordinate plane. The system is connected with a Local Area Network (LAN) in 
the National Institute of Polar Research (NIPR).

(2)  ADBASE system

	ADBASE system consists of another work stations.  A Relational Data Base (RDB) 
system is installed in the work station, and various data, such as solar and geomagnetic 
activity indices, ground-based observation status, satellite orbit, etc., are archived 
in the RDB system.  Users can easily search information about those data with various 
key parameters.  One of the useful functions of the ADBASE system is to search the 
opportunity of conjugate observation between the ground stations and satellites.  ADBASE 
system is also connected with the LAN in NIPR.


6.5.  Application Softwares for Data Analyses

	   IGRF geomagnetic field model (Code Name : MGF)
		Program 'MGF' synthesizes magnetic field elements at a given geographic location and an 
		epoch time.

	   Magnetospheric field model (Code Name : BMNEXT)
		Program 'BMNEXT' synthesizes an external magnetic field according to
		  i)  Olson - Pfitzer model       ii)  Mead - Fairfield model         
        iii)  Tsyganenko - Usmanov model  iv)  Tsyganenko models
       
	   Magnetic Field Line Tracing (Code Name : CONJGT)
		Geomagnetic field line tracing program using Internal (IGRF) + External (BMNEXT) field

	   Geomagnetic Parameter calculation (Code Name : MAGCRD)
		This program calculates dipolar and corrected geomagnetic coordinates and MLT for a 
        given geographic location and an epoch time.

	   Ground-based observation data plot (Code Name : UAPM)
		This program makes a summary plot of the observation data at Syowa, Asuka, Husafell, 
		Isafjordur and Tjornes stations.

	   DMSP satellite trajectory  plot (Code Name : DMSPMAP)

	   E-t diagram  plot of the DMSP auroral electrons and ions (Code Name : DMSPET)

	   Summary plot of the NOAA satellite auroral particles (Code Name : NOAA)

	   High resolution color image processing tool (Code name : IMAGE-TOOL)