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Solar Radio Data

Entry ID: gov.noaa.ngdc.G00216

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Summary

Abstract: ABSTRACT: Scientists monitor the structure of the solar corona, the outer most regions of the Sun's atmosphere, using radio waves. The surface of the Sun is 6,000 degrees Kelvin, while the high corona can reach several million degrees Kelvin. Solar radio emissions at different frequencies allow us to observe radiation from different heights in the atmosphere. The lower the frequency, the higher ... the height of origin. The frequency, like the electron density, decreases uniformly outwards: 245 MHz originates high in the corona, while 15,400 MHz originates in the low corona. The 5 MHz emission corresponds to about 10 solar radii height. For a detailed review, see McLean and Labrum (1985)Solar Radiophysics.Radio bursts are associated with solar flares. The delay at Earth of the different radio frequencies during burst events is due to the outward movement of the source. Bursts can have temperatures of 10xE12 degrees Kelvin. Large bursts last 10 to 20 minutes on average. Longer radio noise storms of persistent and variable high levels of radiation originate in sunspot groups, areas of large, intense magnetic fields. These storms are strongly circularly polarized due to the intense magnetic fields.The microwave wavelength 2800 MHz daily radio flux correlates highly with the daily sunspot number and the two databases are used interchangeably. The 2800 MHz, or 10.7 cm, responds to the same conditions that produce changes in the visible and X-ray wavelengths. Schmahl and Kundu (1995) find that the solar radio fluxes in the spectral range 1000-9400 MHz correlate well with the total solar irradiance. The intermediate frequencies (at 2800 and 3750 MHz) are produced mainly by free-free gyroresonance emission from sunspot structures, while 1000 and 9400 MHz flux are produced mainly by free-free processes from structures associated with plages. They can distinguish plage-associated emission from spot-associated emission in the time series of microwave flux, both contributing opposing effects on the total solar irradiance.

SUPPLEMENTAL INFORMATION: This archive includes: Solar Radio Bursts at fixed frequencies, Event listings from worldwide networks, Solar Radio Flux - Noon Flux Measurements from Ottawa/Penticton (10.7 cm/2800 MHz) and USAF stations (8 fixed frequencies between 245-15,000 MHz), International Astronomical Union QBSA daily solar radio noon flux values -- from 55 stations, for the time period 1949-1986 (722 station-years, 16.6 Mbytes), USAF Radio Solar Telescope Network RSTN 1 second Data - 8 selected frequencies from four worldwide station networks, Solar Radio Spectral Data 1967-present - Spectral Event Listings from worldwide network, andUSAF RSTN Solar Radio Spectral Graphical Data from four Stations, with viewing software and East-West Solar Radio Scans from 1957 - present.

CURRENTNESS REFERENCE: Ground Condition

DATA SET CREATOR: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp.)WDC/STP, Boulder > World Data Center for Solar-Terrestrial Physics, BoulderWDC/Solar Radion Emissions > World Data Center for Solar Radio Emissions, Japan

Purpose: PURPOSE: To provide long-term scientific data stewardship for the Nation's geophysical data, ensuring quality, integrity, and accessibility.

Related URL

Link: GET DATA

Description: Index of ftp site

Link: GET DATA

Description: Home page where data may be downloaded from

Link: VIEW EXTENDED METADATA

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

Link: VIEW RELATED INFORMATION

Description: Home page where data may be downloaded from

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: Please See Summary

Dataset Title: Solar Radio Data

Dataset Release Date: 1973

Dataset Release Place: Boulder, CO

Dataset Publisher: National Geophysical Data Center

Version: First

Other Citation Details: http://www.ngdc.noaa.gov/stp/SOLAR/ftpsolarradio.html

Online Resource: ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SOLAR_RADIO

Temporal Coverage

Start Date: 1947-02-14

Location Keywords

SPACE > SOLAR REGION > CHROMOSPHERE

SPACE > SOLAR REGION > CORONA

Science Keywords

SUN-EARTH INTERACTIONS > SOLAR ACTIVITY > SOLAR RADIO WAVE EMISSIONS

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.

CUSTOM ORDER PROCESS: Contact data center for information

Use Constraints None

Ancillary Keywords

WDC/STP, BOULDER > World Data Center for Solar-Terrestrial Physics, Boulder

DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce

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/

Data Center Personnel
Name: EDWARD H. ERWIN Phone: (303) 497-6133 Fax: (303) 497-6513 Email: Edward.H.Erwin at noaa.gov Contact Address: NOAA/NESDIS/NGDC E/GC2 325 Broadway City: Boulder Province or State: CO Postal Code: 80303 Country: USA

Distribution

Distribution Size: 30745.50

Distribution Format: ASCII

Fees: $100.00/$75.00 plus handling and shipping outside the USA

Personnel

EDWARD H. ERWIN

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Phone: (303) 497-6133

Fax: (303) 497-6513

Email: Edward.H.Erwin at noaa.gov

Contact Address:

NOAA/NESDIS/NGDC

E/GC2

325 Broadway

City: Boulder

Province or State: CO

Postal Code: 80303

Country: USA

Creation and Review Dates

DIF Creation Date: 2009-06-15

Last DIF Revision Date: 2011-03-01

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