<div dir="ltr"><div>Dear colleagues,</div><div><br></div><div>Due to some logistic problems tomorrow's seminar will be rescheduled 1 hour after to <b>September 27th at 4 PM Central European Time (10 AM EDT; 7:30 PM IST)</b>.<br></div><div>To register for the <u>virtual seminar</u>, please send an email to: <b><a href="mailto:iswisupport@bc.edu" target="_blank">iswisupport@bc.edu</a>.</b> Please include “<span class="gmail-il">ISWI</span> Seminar Registration”
in the subject line and we will send the connection details.</div><br><div>Looking forward to meeting you tomorrow!</div><div>With kind regards,<br><br></div><div>Graciela Molina<br>on behalf of the <span class="gmail-il">ISWI</span> Seminar Committee<div><br> <div>***********************************************</div></div><div><div><b>Title:</b> <span style="color:rgb(0,0,0)">NASA’s Geospace Dynamics Constellation: Exploring our Connected Atmosphere</span></div><p style="color:rgb(255,255,255);font-family:"YAD1fQZ_06Y 0",_fb_,auto;line-height:78px"></p><p style="color:rgb(255,255,255);font-family:"YAD1fQZ_06Y 0",_fb_,auto;line-height:40px"><span style="font-weight:700"></span></p><p style="margin-bottom:0in;line-height:17.8px;direction:ltr"><b>Speaker:</b> Dr Doug Rowland</p><div><b><br></b></div><div><b>Abstract:</b> </div></div><span style="color:rgb(80,0,80)"><p class="MsoNormal"><span style="color:black">The
world relies on satellites in low earth orbit (LEO) for a wide range of
commercial, civil space, and defense applications. Though LEO was one
of the first space environments studied from the dawn of the space age,
increased usage of this region has highlighted large gaps in our
understanding and predictive capability. For example, following a SpaceX
launch of 49 Starlink satellites in February 2022, 38 of those
satellites were lost to unexpectedly high atmospheric drag that
ultimately caused them to deorbit. In this region, Earth’s atmophere
extends to form a tenuous envelope of electrically neutral gas called
the thermosphere, and its electrically conductive counterpart, the
ionosphere. These two layers of the upper atmosphere coexist over the
same altitude range, and this has dramatic consequences for the
variability of the LEO space environment. The coupled plasma-gas system
responds to electrodynamic, dynamical, and chemical/photochemical
forcing, at a range of spatial scales from sub-kilometer to global and
time scales from seconds to decades.<u></u><u></u></span></p></span><p class="MsoNormal"><span style="color:black">NASA
plans to develop the Geospace Dynamics Constellation (GDC), a mission
within the Heliophysics Living With a Star Program, as a strategic
mission that will directly probe the causes of variability in the
ionosphere/thermosphere, leading ultimately to a better understanding
and predictive capability for the variability in this region. GDC
consists of six identical spacecraft, equipped with instrumentation to
measure all aspects of the local space environment, including the
properties of the ionosphere and thermosphere and the electric and
magnetic fields and energetic charged particles that serve as major
energy inputs. GDC’s satellites will orbit near 350-400 km altitude, at
high inclination, to provide the first-ever comprehensive, global view
of the LEO space environment’s variability and the casuses of that
variability, on all critical spatiotemporal scales. GDC is currently in
formulation, with launch anticipated in the first part of the next
decade. In this talk, I will present GDC’s science motivation, planned
measurement and sampling strategy.</span></p></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>-------------------------------------------</div><div><div><font face="times new roman, serif"><b>Dra. María Graciela Molina</b><br>Associate Professor FACET -UNT </font></div><div><span style="font-family:"times new roman",serif">Researcher CONICET</span></div><div><span style="font-family:"times new roman",serif">Associated researcher INGV</span></div><div><span style="font-family:"times new roman",serif"><br></span></div><div><span style="font-family:"times new roman",serif">Av. Independencia 1800, </span><span style="font-family:"times new roman",serif">Tucumán - Argentina</span><br></div><div><font face="times new roman, serif">
Tel: +54-381-4364093 (ext.7765)<br><a href="mailto:gmolina@herrera.unt.edu.ar" style="font-style:italic" target="_blank">gmolina@herrera.unt.edu.ar</a> /</font></div><div><font face="times new roman, serif"><a href="mailto:m.graciela.molina@gmail.com" target="_blank"><i>m.graciela.molina@gmail.com</i></a></font><br></div></div></div></div></div></div></div></div></div></div></div></div>