Loading ...
Sorry, an error occurred while loading the content.

Trio of spacecraft analyze space weather

Expand Messages
  • David
    Release: 03-66 SPACECRAFT TRIO PEEKS AT SECRET RECIPE FOR STORMY SOLAR WEATHER A three-spacecraft collaboration recorded for the first time the entire
    Message 1 of 2 , Jun 19, 2003
    View Source
    • 0 Attachment
      Release: 03-66

      SPACECRAFT TRIO PEEKS AT SECRET RECIPE FOR STORMY SOLAR WEATHER

      A three-spacecraft collaboration recorded for the first time the
      entire initiation process of a high-speed eruption of electrified gas
      from the Sun, providing clues about the Sun's secret recipe for stormy
      weather. The April 21, 2002 observation confirmed the predominant
      scenario for how these eruptions, called Coronal Mass Ejections, are
      blasted from the Sun.

      The three spacecraft involved were NASA's Reuven Ramaty High Energy
      Solar Spectroscopic Imager (RHESSI), which takes pictures of flaring
      regions using the Sun's high-energy X-rays and gamma rays; NASA's
      Transition Region and Coronal Explorer (TRACE), which makes images
      using ultraviolet light from the Sun; and the Solar and Heliospheric
      Observatory (SOHO) spacecraft, a collaboration between NASA and the
      European Space Agency.

      "This was the first time that we have been able to identify and study
      in detail the region on the Sun where the initiation and acceleration
      of a coronal mass ejection occurs," said Dr. Peter Gallagher, research
      scientist for RHESSI and SOHO at NASA's Goddard Space Flight Center,
      Greenbelt, Md., and lead author of two papers on this research. "We
      now have a better understanding of how the energy release above the
      surface of the Sun relates to the ejection of material, perhaps
      allowing some real-time forecasts." The results are being presented
      today during a meeting of the American Astronomical Society's Solar
      Physics Division in a press conference at the Johns Hopkins University
      Applied Physics Laboratory, Laurel, Md.

      Coronal Mass Ejections (CME) are often associated with solar flares. A
      flare is a giant explosion in the solar atmosphere that spews
      radiation and results in the heating of solar gas and the acceleration
      of particles to nearly the speed of light. Both events can be
      initiated in a matter of seconds, making their joint observations
      difficult to coordinate.

      The twisting and snapping of magnetic field lines on the Sun, called
      magnetic reconnection, seem to cause CMEs and solar flares. When these
      fields snap from the buildup of magnetic energy, plasma is heated and
      particles are accelerated, resulting in massive explosions and
      emitting radiation ranging from radio waves to X-rays.

      Frequently, a CME and flare will burst from the same region of the Sun
      nearly simultaneously. Just like the debate over whether the chicken
      or the egg came first, solar researchers discuss whether flares cause
      CMEs or the reverse, or if they are more loosely associated.

      The April 21, 2002 observation confirmed the predominant scenario for
      high-speed CMEs (those moving at one million to 5 million miles per
      hour or 1.6 million to 8 million km/hr.). This is where solar magnetic
      fields act like a lid, holding down a blob of gas (CME) that is trying
      to rise. Somehow, the magnetic lid opens, possibly as a result of
      magnetic reconnection and the generation of a flare, and then the CME
      rises from the Sun, dragging the magnetic fields with it. Magnetic
      reconnection continues to energize the associated flare for over 12 hours.

      All three spacecraft played vital roles in confirming that this was
      the process. First, RHESSI saw a gradually increasing burst of X-rays
      announcing the start of the flare. TRACE observed the CME in the
      extreme ultraviolet as it began to rise from the Sun. Several minutes
      later, RHESSI saw a burst of high energy X-rays under the erupting
      CME, and TRACE saw a similar explosion of ultraviolet rays, both
      indicating a large flare. SOHO then captured the CME as it continued
      moving away from the Sun.

      "Each of these spacecraft is quite complementary," said Gallagher.
      "It's only through their coordination in this observation that we're
      now able to understand the predominant scenario for these fast, large
      coronal mass ejections and the associated flares."

      The current results feed into the decades-old controversy over whether
      solar flares cause coronal mass ejections, or vice versa. While the
      first signs of the flare occur before the CME liftoff, the bulk of the
      flare energy is released later, after the CME has already been
      accelerated. The two phenomena are revealed to be merely different
      aspects of the same event, according to the team. For images and more
      information, refer to:

      http://www.gsfc.nasa.gov/topstory/2003/0617rhessicme.html
    • mike
      Very interesting, David. ... From: David To: methanehydrateclub@yahoogroups.com Date: Fri, 20 Jun 2003 04:02:55 -0000 Subject:
      Message 2 of 2 , Jun 20, 2003
      View Source
      • 0 Attachment
        Very interesting, David.

        -----Original Message-----
        From: "David" <b1blancer1@...>
        To: methanehydrateclub@yahoogroups.com
        Date: Fri, 20 Jun 2003 04:02:55 -0000
        Subject: [Methane Hydrate Club] Trio of spacecraft analyze space weather

        > <html><body>
        >
        >
        > <tt>
        > Release:  03-66<BR>
        > <BR>
        > SPACECRAFT TRIO PEEKS AT SECRET RECIPE FOR STORMY SOLAR WEATHER<BR>
        > <BR>
        > A three-spacecraft collaboration recorded for the first time the<BR>
        > entire initiation process of a high-speed eruption of electrified
        > gas<BR>
        > from the Sun, providing clues about the Sun's secret recipe for
        > stormy<BR>
        > weather. The April 21, 2002 observation confirmed the predominant<BR>
        > scenario for how these eruptions, called Coronal Mass Ejections,
        > are<BR>
        > blasted from the Sun.<BR>
        > <BR>
        > The three spacecraft involved were NASA's Reuven Ramaty High Energy<BR>
        > Solar Spectroscopic Imager (RHESSI), which takes pictures of
        > flaring<BR>
        > regions using the Sun's high-energy X-rays and gamma rays; NASA's<BR>
        > Transition Region and Coronal Explorer (TRACE), which makes images<BR>
        > using ultraviolet light from the Sun; and the Solar and
        > Heliospheric<BR>
        > Observatory (SOHO) spacecraft, a collaboration between NASA and the
        > <BR>
        > European Space Agency.<BR>
        > <BR>
        > "This was the first time that we have been able to identify and
        > study<BR>
        > in detail the region on the Sun where the initiation and
        > acceleration<BR>
        > of a coronal mass ejection occurs," said Dr. Peter Gallagher,
        > research<BR>
        > scientist for RHESSI and SOHO at NASA's Goddard Space Flight Center,
        > <BR>
        > Greenbelt, Md., and lead author of two papers on this research.
        > "We<BR>
        > now have a better understanding of how the energy release above the<BR>
        > surface of the Sun relates to the ejection of material, perhaps<BR>
        > allowing some real-time forecasts." The results are being
        > presented<BR>
        > today during a meeting of the American Astronomical Society's Solar<BR>
        > Physics Division in a press conference at the Johns Hopkins
        > University<BR>
        > Applied Physics Laboratory, Laurel, Md.<BR>
        > <BR>
        > Coronal Mass Ejections (CME) are often associated with solar flares.
        > A<BR>
        > flare is a giant explosion in the solar atmosphere that spews<BR>
        > radiation and results in the heating of solar gas and the
        > acceleration<BR>
        > of particles to nearly the speed of light. Both events can be<BR>
        > initiated in a matter of seconds, making their joint observations<BR>
        > difficult to coordinate. <BR>
        > <BR>
        > The twisting and snapping of magnetic field lines on the Sun,
        > called<BR>
        > magnetic reconnection, seem to cause CMEs and solar flares. When
        > these<BR>
        > fields snap from the buildup of magnetic energy, plasma is heated
        > and<BR>
        > particles are accelerated, resulting in massive explosions and<BR>
        > emitting radiation ranging from radio waves to X-rays. <BR>
        > <BR>
        > Frequently, a CME and flare will burst from the same region of the
        > Sun<BR>
        > nearly simultaneously. Just like the debate over whether the
        > chicken<BR>
        > or the egg came first, solar researchers discuss whether flares
        > cause<BR>
        > CMEs or the reverse, or if they are more loosely associated. <BR>
        > <BR>
        > The April 21, 2002 observation confirmed the predominant scenario
        > for<BR>
        > high-speed CMEs (those moving at one million to 5 million miles per<BR>
        > hour or 1.6 million to 8 million km/hr.). This is where solar
        > magnetic<BR>
        > fields act like a lid, holding down a blob of gas (CME) that is
        > trying<BR>
        > to rise. Somehow, the magnetic lid opens, possibly as a result of<BR>
        > magnetic reconnection and the generation of a flare, and then the CME
        > <BR>
        > rises from the Sun, dragging the magnetic fields with it. Magnetic<BR>
        > reconnection continues to energize the associated flare for over 12
        > hours.<BR>
        > <BR>
        > All three spacecraft played vital roles in confirming that this was<BR>
        > the process. First, RHESSI saw a gradually increasing burst of
        > X-rays<BR>
        > announcing the start of the flare. TRACE observed the CME in the<BR>
        > extreme ultraviolet as it began to rise from the Sun. Several
        > minutes<BR>
        > later, RHESSI saw a burst of high energy X-rays under the erupting<BR>
        > CME, and TRACE saw a similar explosion of ultraviolet rays, both<BR>
        > indicating a large flare. SOHO then captured the CME as it continued
        > <BR>
        > moving away from the Sun.<BR>
        > <BR>
        > "Each of these spacecraft is quite complementary," said
        > Gallagher.<BR>
        > "It's only through their coordination in this observation that
        > we're<BR>
        > now able to understand the predominant scenario for these fast,
        > large<BR>
        > coronal mass ejections and the associated flares."<BR>
        > <BR>
        > The current results feed into the decades-old controversy over
        > whether<BR>
        > solar flares cause coronal mass ejections, or vice versa. While the<BR>
        > first signs of the flare occur before the CME liftoff, the bulk of
        > the<BR>
        > flare energy is released later, after the CME has already been<BR>
        > accelerated. The two phenomena are revealed to be merely different<BR>
        > aspects of the same event, according to the team. For images and more
        > <BR>
        > information, refer to:<BR>
        > <BR>
        > <a
        > href="http://www.gsfc.nasa.gov/topstory/2003/0617rhessicme.html">http:/
        > /www.gsfc.nasa.gov/topstory/2003/0617rhessicme.html</a><BR>
        > <BR>
        > </tt>
        >
        > <br>
        >
        > <!-- |**|begin egp html banner|**| -->
        >
        > <table border=0 cellspacing=0 cellpadding=2>
        > <tr bgcolor=#FFFFCC>
        > <td align=center><font size="-1" color=#003399><b>Yahoo! Groups
        > Sponsor</b></font></td>
        > </tr>
        > <tr bgcolor=#FFFFFF>
        > <td align=center width=470><a
        > href="http://rd.yahoo.com/M=251812.3170658.4537139.1261774/D=egroupweb/
        > S=1705083601:HM/A=1564416/R=0/SIG=11ti81skc/*http://www.netflix.com/Def
        > ault?mqso=60164797&partid=3170658"><img
        > src="http://us.a1.yimg.com/us.yimg.com/a/ne/netflix/yhoo0303_b_300250a.
        > gif" alt="" width="300" height="250" border="0"></a></td>
        > </tr>
        > <tr><td><img alt="" width=1 height=1
        > src="http://us.adserver.yahoo.com/l?M=251812.3170658.4537139.1261774/D=
        > egroupmail/S=:HM/A=1564416/rand=462490968"></td></tr>
        > </table>
        >
        > <!-- |**|end egp html banner|**| -->
        >
        >
        > <br>
        > <tt>
        > To unsubscribe from this group, send an email to:<BR>
        > methanehydrateclub-unsubscribe@yahoogroups.com<BR>
        > <BR>
        > </tt>
        > <br>
        >
        > <br>
        > <tt>Your use of Yahoo! Groups is subject to the <a
        > href="http://docs.yahoo.com/info/terms/">Yahoo! Terms of
        > Service</a>.</tt>
        > </br>
        >
        > </body></html>
      Your message has been successfully submitted and would be delivered to recipients shortly.