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Collection:
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NASA Planetary Photo Journal Collection
Collection
NASA Planetary Photo Journal Collection
Collection
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Title:
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Lightning, Crackles and Pops
Title
Lightning, Crackles and Pops
Title
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Original Caption Released with Image:
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Figure 1 The speckles in this graph are radio signals from lightning in Saturn's atmosphere detected by Cassini. Just as one can hear lightning on an AM radio as crackles and pops, Cassini's radio and plasma wave science instrument detects Saturn lightning as bursty signals over a broad frequency range. This presentation shows the intensity of radio emissions in color as well as their frequency (vertical axis) and time (horizontal axis) on July 13, 2004. Black represents no detectable signal. The lightning emissions appear as short bursts scattered over frequencies from a few megahertz to 16 megahertz. During this time Cassini was 4.9 million kilometers (3.1 million miles) from Saturn. Saturn lightning, like Earth lightning, emits radio emissions over a very broad frequency range. The bursts seen here appear at relatively narrow frequencies. This is because it takes Cassini several seconds to sweep the entire frequency range, but the radio bursts last just a small fraction of a second. So, Cassini detects the bursts at whatever frequency it happens to be at in its sweep when a burst occurs. During the 18-hour interval represented in this display, Cassini detected two general intervals of lightning signals separated by 10 or 11 hours. During this time, Saturn rotated around its axis once -- one Saturn day. So, these signals appear to be coming from the same storm system in the atmosphere which lasted for at least a Saturn day. However, the appearance of the radio emissions is quite different after one day, indicating the storm system is evolving on this time scale. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. The radio and plasma wave science team is based at the University of Iowa, Iowa City. For more information about the Cassini-Huygens mission, visit http://saturn.jpl.nasa.gov and the instrument team's home page, http://www-pw.physics.uiowa.edu/plasma-wave/cassini/home.html.
Original_Caption_Rel eased_with_Image
Figure 1 The speckles in this graph are radio signals from lightning in Saturn's atmosphere detected by Cassini. Just as one can hear lightning on an AM radio as crackles and pops, Cassini's radio and plasma wave science instrument detects Saturn lightning as bursty signals over a broad frequency range. This presentation shows the intensity of radio emissions in color as well as their frequency (vertical axis) and time (horizontal axis) on July 13, 2004. Black represents no detectable signal. The lightning emissions appear as short bursts scattered over frequencies from a few megahertz to 16 megahertz. During this time Cassini was 4.9 million kilometers (3.1 million miles) from Saturn. Saturn lightning, like Earth lightning, emits radio emissions over a very broad frequency range. The bursts seen here appear at relatively narrow frequencies. This is because it takes Cassini several seconds to sweep the entire frequency range, but the radio bursts last just a small fraction of a second. So, Cassini detects the bursts at whatever frequency it happens to be at in its sweep when a burst occurs. During the 18-hour interval represented in this display, Cassini detected two general intervals of lightning signals separated by 10 or 11 hours. During this time, Saturn rotated around its axis once -- one Saturn day. So, these signals appear to be coming from the same storm system in the atmosphere which lasted for at least a Saturn day. However, the appearance of the radio emissions is quite different after one day, indicating the storm system is evolving on this time scale. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. The radio and plasma wave science team is based at the University of Iowa, Iowa City. For more information about the Cassini-Huygens mission, visit http://saturn.jpl.nasa.gov and the instrument team's home page, http://www-pw.physics.uiowa.edu/plasma-wave/cassini/home.html.
Original Caption Released with Image
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Image Credit:
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NASA/JPL/University of Iowa
Image_Credit
NASA/JPL/University of Iowa
Image Credit
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Produced By:
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JPL
Produced_By
JPL
Produced By
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Mission:
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Cassini
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Spacecraft:
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Cassini Orbiter
Spacecraft
Cassini Orbiter
Spacecraft
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Target Name:
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Saturn
Target_Name
Saturn
Target Name
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Is a satellite of:
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Sol (our sun)
Is_a_satellite_of
Sol (our sun)
Is a satellite of
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Instrument:
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Radio and Plasma Wave Science Instrument
Instrument
Radio and Plasma Wave Science Instrument
Instrument
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Product Size:
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403 samples x 327 lines
Product_Size
403 samples x 327 lines
Product Size
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Primary Data Set:
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Cassini
Primary_Data_Set
Cassini
Primary Data Set
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facet_what:
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Sun
facet_what
Sun
facet_what
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facet_what:
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Earth
facet_what
Earth
facet_what
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facet_what:
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Saturn
facet_what
Saturn
facet_what
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facet_what:
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Cassini
facet_what
Cassini
facet_what
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facet_what:
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Cassini Orbiter
facet_what
Cassini Orbiter
facet_what
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facet_what:
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Huygens Probe
facet_what
Huygens Probe
facet_what
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facet_what:
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Cassini-Huygens
facet_what
Cassini-Huygens
facet_what
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facet_what:
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Radio and Plasma Wave Science Instrument
facet_what
Radio and Plasma Wave Science Instrument
facet_what
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facet_where:
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Jet Propulsion Laboratory
facet_where
Jet Propulsion Laboratory
facet_where
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facet_where:
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Saturn
facet_where
Saturn
facet_where
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facet_where:
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California
facet_where
California
facet_where
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facet_where:
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Washington
facet_where
Washington
facet_where
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facet_where:
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Iowa
facet_where
Iowa
facet_where
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facet_where:
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Jet Propulsion Laboratory (JPL)
facet_where
Jet Propulsion Laboratory (JPL)
facet_where
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facet_where:
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Washington, D.C.
facet_where
Washington, D.C.
facet_where
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facet_when:
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July 13, 2004
facet_when
July 13, 2004
facet_when
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facet_when_year:
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2004
facet_when_year
2004
facet_when_year
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Image #:
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PIA06417
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UID:
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SPD-PHOTJ-PIA06417
UID
SPD-PHOTJ-PIA06417
UID
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orignial url:
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orignial_url
orignial url
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