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Information About Low Energy Particles That Cause the Aurora and Other High Latitude Phenomena

Entry ID: gov.noaa.ngdc.G01122

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Summary

Abstract: ABSTRACT: DMSP SSJ/4 data provide a complete energy spectrum of the low energy particles that cause the aurora and other high latitude phenomena. The data set consists of electron and ion particle fluxes between 30 eV and 30 KeV recorded every second, satellite ephemeris and magnetic coordinates where the particles are likely to be absorbed by the atmosphere. Differential particle fluxes may be as ... large as 10 (10) at the lowest energies. The detectors also record high energy ions that penetrate both the satellite and the instrument. This is most noticeable in the South Atlantic Anomaly and the "horns" of the radiation belts. The SSJ/4 instrument was designed to measure the flux of charged particles as they enter the Earth's upper atmosphere from the near-Earth space environment. It consists of four electrostatic analyzers that record electrons and ions between 30 eV and 30 KeV as they flow past the spacecraft toward the Earth. The instruments "look" toward the satellite zenith. The curved plate detectors allow precipitating electrons and ions to enter through an aperture of about 2 x 10 (FWHM). Electrons and ions of the selected energy are deflected toward the target by an imposed electric field applied across the two plates. The two low energy detectors consist of 10 channels centered at 34, 49,71, 101,150,218, 320, 460, 670, and 960 KeV. The high energy detector measures particles in 10 channels centered at 1.0, 1.4, 2.1, 3.0, 4.4, 6.5, 9.5, 14.0, 20.5, and 29.5 KeV. Each detector dwells at each channel for 0.09 seconds from high energy channel to low. A complete cycle is sampled each second. The nominal response efficiency is 50% at a value of 10% of the central energy for that channel. The instruments are built by Emmanuel College under contract from the Space Physics Division of Phillips Laboratory and calibrated at Rice University. The National Geophysical Data Center (NGDC) has received DMSP precipitating electron and ion data since March 1975 from sensors SSJ/2, SSJ/3 and SSJ/4 on satellites 31, 32, 33, F-1, F-2, F-3, F-4, F-6, F-7, F-8, F-9, F-10, and F-11. Processed data from March 75 to December 92 were received from AFGWC on magnetic tape. Since March 9, 1992 we have received raw satellite data from the ARchive Processing System on 8 mm tapes. Archive tapes are organized by satellite-orbit and they contain an automated format statement, an inventory, header information for each orbit and data records. Each data record consists of the satellite ephemeris in geographic and geomagnetic coordinates and 4 one-second-values in units of differential particle flux for the 40 channels. Sample imagery applications and documentation are available via FTP, GOPHER, MOSAIC and the NGDC BBS. Contact the Data Manager at 303 497-6126 for details.

CURRENTNESS REFERENCE: Ground Condition

Purpose: PURPOSE: High Latitude Phenomena Research

Related URL

Link: GET DATA

Link: VIEW EXTENDED METADATA

Description: View Source Metadata document from the Metadata Manager and Repository (NMMR).

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: 90.0

S: -90.0

E: 180.0

W: -180.0

Data Set Citation

Dataset Originator/Creator: DOD/USAF/AFWA > Air Force Weather Agency, U.S. Air Force, U.S. Department of DefenseDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp)

Dataset Title: Information About Low Energy Particles That Cause the Aurora and Other High Latitude Phenomena

Dataset Release Date: 1992

Dataset Release Place: Boulder, CO

Dataset Publisher: National Geophysical Data Center

Version: First

Online Resource: http://www.ngdc.noaa.gov/dmsp

Temporal Coverage

Start Date: 1974-04-01

Science Keywords

SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE FLUX > ELECTRON FLUX

SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE FLUX > PROTON FLUX

ISO Topic Category

GEOSCIENTIFIC INFORMATION

Project

ESIP > Earth Science Information Partners Program

Access Constraints ACCESS CONSTRAINTS: No Constraints

DISTRIBUTION LIABILITY: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

CUSTOM ORDER PROCESS: Contact data center for information

Use Constraints None

Ancillary Keywords

Global

Magnetosphere

Data Set Progress

IN WORK

Data Center

National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce

Data Center URL: http://www.ngdc.noaa.gov/
Dataset ID: ______DMSP ____

Data Center Personnel
Name: DATA MANAGER NGDC/DMSP DATA ARCHIVE, RESEARCH, AND PRODUCTS Phone: (303) 497-6126 Fax: (303) 497-6513 Email: ngdc.dmsp at noaa.gov Contact Address: NOAA/NESDIS/NGDC E/GC2 325 Broadway City: Boulder Province or State: CO Postal Code: 80305-3328 Country: USA

Distribution

Distribution Size: 100.000000

Distribution Format: ASCII

Fees: Depends on the Data Set

Personnel

EI FUJIOKA

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Phone: 919-613-8021

Fax: 919-684-8741

Email: efujioka at duke.edu

Contact Address:

LSRC A321

Box 90328

City: Durham

Province or State: NC

Postal Code: 27708

Country: USA

TIM GERRODETTE

Role: TECHNICAL CONTACT

Phone: 858.546.7131

Email: tim.gerrodette at noaa.gov

Contact Address:

Southwest Fisheries Science Center

8604 La Jolla Shores Dr

City: La Jolla

Province or State: CA

Postal Code: 92037

Country: USA

Publications/References

Hill, P. Scott, Alan Jackson, and Tim Gerrodette. Report of a Marine Mammal
Survey of the Eastern Tropical Pacific aboard the R/V David Starr Jordan, July
29-December 7, 1989. 1990. NOAA-TM-NMFS-SWFC-142.

Creation and Review Dates

DIF Creation Date: 2007-04-11

Last DIF Revision Date: 2008-01-13

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