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<!DOCTYPE doctype PUBLIC "-//w3c//dtd html 4.0 transitional//en">
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<title>MSU PHYSICS FACULTY - Dana Longcope</title>
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<body>
<b><font color="#006600"><font size="+3">A pictoral tour of my research</font></font></b>
<p><b><font size="+1">X-ray bright points: "reconnection observed"</font></b>
</p>
<li> Magnetic concentrations inthe <a
href="http://solar.physics.montana.edu/dana/context.jpg">quiet Sun</a> move
around (<a href="http://solar.physics.montana.edu/dana/bp_movie.mpg">a movie</a>)</li>
<br>
and interact to create an X-ray bright point. <br>
<img src="t171_zoom_plot_SM.gif" height="161" width="156">
<img src="skel_cmp_plot_SM.gif" height="159" width="140">
<br>
<img src="xbp1_skel_plot.gif" height="149" width="346">
<br>
TRACE 171 A image of an X-ray bright point & a loop of <br>
post-reconnected flux. <li> <a
href="http://solar.physics.montana.edu/dana/xbp1_cck.mpg">A movie</a> of
the TRACE obervations (171 & 195)</li>
<li> <a href="http://solar.physics.montana.edu/dana/strm.mpg">A movie </a>
of post-reconnection plasma (theoretical model)</li>
<li> <a href="http://solar.physics.montana.edu/dana/nano2.mpg">A movie </a>
of multiple post-reconnection loops (theoretical model)</li>
<p><br>
In collaboration with Charles Kankelborg and Rebecca McMullen <br>
<font color="#660000">[ Research funded by NASA ]</font> </p>
<p><b><font size="+1">Characterizing the connectivity of magnetic fields:</font></b>
<br>
<img src="mdi1120_sm.gif" height="220" width="244" align="middle">
<img src="tr1122.gif" height="279" width="365" align="middle">
<br>
<img src="spx0.gif" height="391" width="407">
<br>
<b>The separatrix of an active region. </b> The line-of-sight magnetogram
(above left) is modeled <br>
as a set of discrete sources (labeled). The separatrix (below) encompases
all field lines <br>
connecting to a particular source: <b><font color="#ff0000">P10.</font></b>
This may be the structure visible in 195A emission observed <br>
by TRACE (above right). <a
href="http://solar.physics.montana.edu/muri/nuggets/jun2002/flare.html">A
more detailed description.</a> <br>
<font color="#660000">[ Research funded by the NSF ]</font> </p>
<p><font size="+2">Determining photospheric flows from B-field measurements</font>
<br>
<img src="mef1838-1909.gif" height="590" width="660" alt="MEF image">
<br>
The velocity field within active region 8210 (<a
href="http://solar.physics.montana.edu/muri/nuggets/2002_mar.html">more info
on this region</a>) <br>
inferred by application of the induction equation to vector <br>
magentic field measurements. The induction equation is summarized<br>
by this plot of the changing vertical field (grey-scale) and the electric
field<br>
it demands (contours)<br>
</p>
<p><img src="db1838-1909.gif" alt="dBz/dt" width="609" height="556">
<br>
</p>
<p>In collaboration with Stephane Regnier and K.D. Leka<br>
<font color="#660000">[ Research funded by the DoD under <a
href="http://solarmuri.ssl.berkeley.edu/">MURI</a> ]</font> </p>
<p><b><font size="+1">Twist and writhe in magnetic flux tubes</font></b> <br>
<img src="twist.gif" height="250" width="350">
<br>
A flux tube with twist and writhe. ( <a
href="http://solar.physics.montana.edu/dana/ft3.mpg">movie of writhing tube.</a>
) <br>
<font color="#660000">[ Research funded by NASA ]</font> <br>
<a href="http://solar.physics.montana.edu/dana/string.gif"></a> </p>
<br>
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