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Metadata Identifier: gov.noaa.ngdc.stp.solar:solar-features_solar-features_solar-radio
MD_DataIdentification
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Solar Radio |
Scientists monitor the structure of the solar corona, the outer most regions
of the Sun's atmosphere, using radio waves (100?s of MHz to 10?s of GHz). Variations
in the radiowave spectrum reveal characteristics of the corona and upper
chromosphere in terms of altitude profile for the local plasma temperature, density
and magnetic field. Typically, the lower the frequency then the higher the
height of origin. The frequency, like the solar electron density, decreases uniformly
outwards with 245 MHz originating high in the corona whereas 15,400 MHz
originates in the low corona. 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.
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SV_Identification
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Collection included as a part of the NGDC Official Archive. |
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NASA/GCMD Data Center Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R.
Vogel, S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau,
M. Holland, T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory
(GCMD) Earth Science Keywords. Version 6.0.0.0.0.
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NASA/GCMD Earth Science Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R.
Vogel, S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau,
M. Holland, T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory
(GCMD) Earth Science Keywords. Version 6.0.0.0.0.
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NASA/GCMD Instrument Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel,
S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland,
T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory (GCMD) Earth
Science Keywords. Version 6.0.0.0.0.
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NASA/GCMD Location Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel,
S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland,
T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory (GCMD) Earth
Science Keywords. Version 6.0.0.0.0.
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NASA/GCMD Platform Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel,
S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland,
T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory (GCMD) Earth
Science Keywords. Version 6.0.0.0.0.
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NASA/GCMD Project Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel,
S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland,
T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory (GCMD) Earth
Science Keywords. Version 6.0.0.0.0
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Solar Flares: H-alpha |
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Solar Radio |
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solarFeatures |
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DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, National Environmental Satellite,
Data, and Information Service, National Oceanic and Atmospheric Administration, Department
of Commerce
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resourceProvider |
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Dr William Denig |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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solar.ngdc@noaa.gov |
distributor |
http://www.ngdc.noaa.gov/stp/spaceweather.html |
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NOAA National Geophysical Data Center (NGDC) |
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solar.ngdc@noaa.gov |
resourceProvider |
http://www.ngdc.noaa.gov/ |
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Scientific Data Stewardship provided by the National Geophysical Data Center, NESDIS,
NOAA, U.S. Department of Commerce.
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originator |
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William Denig |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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solar.ngdc@noaa.gov |
pointOfContact |
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William Denig |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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solar.ngdc@noaa.gov |
custodian |
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William Denig |
NOAA/NESDIS/NGDC E/GC2 325 Broadway |
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solar.ngdc@noaa.gov |
processor |
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ftp://ftp.ngdc.noaa.gov/STP/space-weather/solar-data/solar-features/solar-radio/ |
Solar Radio Data |
A variety of datasets related to solar radio emissions. Included are datasets related
to solar radio bursts (tables and reports), listings from the International Astronomical
Union's Bulletin of Solar Activity (53 stations), noontime solar radio flux measurements
(5 stations), 1-sec solar flux measurements from the Radio Solar Telescope Netword
(RSTN), and RSTN solar spectral measurements.
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download |
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http://www.ngdc.noaa.gov/ |
NOAA National Geophysical Data Center (NGDC) |
NOAA's National Geophysical Data Center (NGDC) provides scientific stewardship, products,
and services for geophysical data from the Sun to the Earth and Earth's sea floor
and solid earth environment, including Earth observations from space.
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http://www.ngdc.noaa.gov/stp/spaceweather.html |
Space Weather |
Numerous datasets pertaining to space weather. |
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Bounding Box |
Temporal Extent |
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Data assembled from data provided by various solar observatories located worldwide. |
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180 |
90 |
-90 |
1955-07-01 |
2010-11-24 |
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1955-07-01 |
2010-11-24 |
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1955-07-01 |
2010-11-24 |
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binary |
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Some data provided in native format as received from provider. |
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pdf |
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Most data provided in Adobe Portable Document Format (pdf). |
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txt |
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Some data provide in American Standard Code for Information Interchange (ASCII) text
format.
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Solar features |
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Collection includes a variety of solar feature datasets contributed by a number of
national and private solar observatories located worldwide. Collection includes lists
of optical solar flares observed in H-alpha and x-rays, solar radio data, prominences
and filaments, plague regions and faculae, and sunspots.
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Collection included as a part of the NGDC Official Archive. |
2011-01-01 |
The NOAA Solar and Terrestrial Physics Division is responsible
for managing this collection.
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Solar Flares: H-alpha |
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Flares observed in H-alpha. |
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Datasets prepared by professional staff within the Solar and Terrestrial
Physics Division at the National Geophysical Data Center.
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2010-09-30T00:00:00 |
Flare listings compiled using data received from various solar observatories.
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