Solar activity

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Heliospheric radio emissions recorded during Voyager 1 space mission by Don Gurnett from U.Iowa at 2-3 kHz. They are produced when the interplanetary shock interacts with the heliopause, which is the boundary between the solar wind and the interstellar plasma. The color frequency-time spectrogram available here, which covers a time period of 22 years (from 1982 through 2003), has three such events, a moderately strong event in 1983-84, a very strong event in 1992-94, and a new weak 2002-03 event. Typically it takes a year or more for the shock to travel from the Sun to the heliopause, but less than a day for the radio emission to propagate from the source region to Voyager.

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A type II solar burst of class X 22 recorded on April 2, 2001 at 2151 UTC at 50 MHz by Thomas Ashcraft. This is the 2d largest event on record after the class-X 28 "mega flare" that occured on Nov 4, 2003

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A class X5.6 solar flare recorded on April 6, 2001 at 1910 UTC by Thomas Ashcraft. The peak was observed in X-rays at 1912 UTC. Was followed by spectacular auroras.

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A class X2 solar flare recorded at 20.080 MHz on May 20, 2002 by Thomas Ashcraft

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Type V solar radio bursts from the Active Region AR798 recorded on Sep 15, 2005 between 2037-2039 UT. Left channel at 22.2 MHz, right chanel at 22.7 Mhz. Such emissions follows a Type III burst and are X-mode polarized. They are caused by slower Type III-like electrons in widely diverging magnetic fields, with both forward and counterstreaming Langmuir Waves, perhaps generated by the previous passage of Type III electrons. Here is the signal progression. Documents Thomas Ashcraft. Here are a white light and H-alpha pictures of the area recorded one month earlier respectively by Denis Fell and HKAS.

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A type III solar burst recorded on November 4, 2003 by Cassini spaceprobe. Type III solar radio bursts are produced by very energetic (1 to 100 keV) electrons emitted by a solar flare. Document from Don Gurnett, Principal Investigator of the Cassini RPWS at U.Iowa

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A type III solar burst recorded on October 28, 2003 by Cassini spaceprobe. It generated a class X17.2 event. Document Don Gurnett from U.Iowa

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Acoustic recording of a type III solar burst recorded on October 30, 2001 at 1215z by Peter Messmer

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Solar burst recorded at 20.1 MHz on September 20, 2000 at 2230 UTC. These signals were recorded at the Windward Community College Radio Observatory in Hawaii (WCC Hawaii for short) and published on this site with the courtesy of Dr. Joe Ciotti, Director of the Center for Aerospace Education.

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Solar burst recorded on September 21, 2000 at 2304 UTC by WCC Hawaii

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A type III solar burst recorded at 20.1 MHz on September 10, 2000 at 2200 UTC by Thomas Ashcraft

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Solar burst recorded near 20.1 MHz on June 14, 2000 by Radio Jove Team at GSFC

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Solar burst recorded near 20.1 MHz on June 12, 2000 by Radio Jove Team at GSFC

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Acoustic recording of a type III solar burst recorded on November 23, 1998 at 10h56m47s UTC at frequencies ranging between 1140-2280 MHz by Peter Messmer and al. at the Institute of Astronomy, ETH, in Switzerland. Such bursts are interpreted by electron beams accelerated in the corona and moving toward lower altitudes.

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Acoustic recording of a type III solar burst recorded on September 23, 1998 at 6h53m50s UTC between 1000-1900 MHz by Peter Messmer at the Institute of Astronomy, ETH, in Switzerland. We hear patches drifting to higher frequencies indicating that radio sources are moving to higher density and thus presumably downward in the solar corona. The author provides also a CD titled "Sound of a distant Sun"

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Acoustic recording of a type U solar bursts recorded on September 11, 1998 at 16h01m27s UTC between 579-1020 MHz by Peter Messmer and al. Such bursts are caused by electron beams following a loop-like magnetic field, first up and then down. Between the two U bursts, a faint, drifting structure can be heard.

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Acoustic recording of various solar and terrestrial activities followed by Type III solar bursts. Recorded by Peter Messmer and al.

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Acoustic recording of a sun rise with some terrestrial parasits. Recorded by Peter Messmer and al. at the Institute of Astronomy, ETH, in Switzerland.

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Acoustic recording of various type III solar bursts, each frequency being assigned to a instrument. Recorded by Peter Messmer at the Institute of Astronomy, ETH, in Switzerland.

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Solar eruptions recorded by Altaïr

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Solar burst recorded at 18 MHz, recorded at University of Florida Radio Observatory (UFRO)