<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="font-family: Helvetica; font-size: large; "><b><div><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 11px; font-weight: normal;">Dear all,</span></font></div><div><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 11px; font-weight: normal;"><br></span></font></div><div><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 11px; font-weight: normal;">You may be interested in our paper, which has just been accepted for publication in ApJL and which adds to the current debate on periodic flows and waves.</span></font></div><div><span class="Apple-style-span" style="font-family: Helvetica; font-size: large; "><b><br></b></span></div>Periodic spectral line asymmetries in solar coronal structures from slow magnetoacoustic waves</b></span><div>Verwichte, E., Marsh, M., Foullon, C., Van Doorsselaere, T., De Moortel, I., Hood, A.W. and Nakariakov, V.M. </div><div><span class="Apple-style-span" style="font-family: Helvetica; font-size: large; "><b><span class="Apple-style-span" style="font-family: Verdana; font-weight: normal; font-size: 10px; "><br></span></b></span></div><div>Abstract:<i> Recent spectral observations of upward moving quasi-periodic intensity perturbations in solar coronal structures have shown evidence of periodic line asymmetries near their footpoints. These observations challenge the established interpretation of the intensity perturbations in terms of propagating slow magnetoacoustic waves. We show that slow waves inherently have a bias towards enhancement of emission in the blue wing of the emission line due to in-phase behaviour of velocity and density perturbations. We demonstrate that slow waves cause line asymmetries when the emission line is averaged over an oscillation period or when a quasi-static plasma component in the line-of-sight is included. Therefore, we conclude that slow magnetoacoustic waves remain a valid explanation for the observed quasi-periodic intensity perturbations.</i></div><div><span class="Apple-style-span" style="font-family: Helvetica; font-size: large; "><b><span class="Apple-style-span" style="font-family: Verdana; font-weight: normal; font-size: 10px; "><br></span></b></span></div><div><a href="http://go.warwick.ac.uk/erwin_verwichte/publications/verwichte_apjl2010.pdf"></a><a href="http://go.warwick.ac.uk/erwin_verwichte/publications/verwichte_apjl2010.pdf">http://go.warwick.ac.uk/erwin_verwichte/publications/verwichte_apjl2010.pdf</a></div><div><br></div><div>Best regards,</div><div><br></div><div>Erwin</div><div><font class="Apple-style-span" size="2"><span class="Apple-style-span" style="font-size: 10px; "><br></span></font></div><div><font class="Apple-style-span" size="2"><span class="Apple-style-span" style="font-size: 10px;"><br></span></font></div><br><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 10px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 10px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 10px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>Dr Erwin Verwichte</div><div>Centre for Fusion, Space and Astrophysics</div><div>Department of Physics</div><div>University of Warwick</div><div>Coventry CV4 7AL, United Kingdom</div><div>Office PS1.09</div><div>tel: +44(0)2476524917</div><div>fax: +44(0)2476524887</div><div><a href="http://www.warwick.ac.uk/go/erwin_verwichte">http://www.warwick.ac.uk/go/erwin_verwichte</a></div><div><br></div></div><br></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline">
</div>
<br></body></html>