CEDAR email: Haystack's 21st Annual Michael J. Buonsanto Memorial Lecture - Thursday, 5 Nov 2020 @ 15:00 EST / 20:00 UTC

[Phil Erickson]

Hi all,

  On behalf of MIT Haystack Observatory, we are pleased to announce the
21st Annual Michael J. Buonsanto Memorial Lecture.  This event will be
online-only, and the link will be posted to the lecture series page before
the event.  All are welcome to attend!

  Buonsanto Memorial Lecture Series home page:

https://www.haystack.mit.edu/conference-2/buonsanto-lecture/

  This year's lecture is presented by

Alan J. Burns
High Altitude Observatory, National Center for Atmospheric Research,
Boulder, CO

Title:
Geomagnetic activity effects on thermospheric composition as seen by GOLD

Abstract:
Geomagnetic storms cause large changes in the ionosphere. There are both
increases (positive storm effects) and decreases (negative storm effects)
in electron density at the F2 peak and in the topside ionosphere (hence in
TEC too). Over 60 years ago, Seaton suggested that thermospheric neutral
composition might be the source of the negative geomagnetic storm effects
in the ionosphere. Since that time, much progress has been made in
determining the nature and causes of these composition changes. However,
this work has been hampered until recently by the inability to separate
longitude, universal time and local time effects. Because of the large
number of ways that geomagnetic storms can vary from each other, this
results in an observational understanding of storm-time composition changes
that is essentially climatological, much as it has been for many years.
Some insight into the weather of geomagnetic storms has been gained from
models, but this too is limited by the way that the geomagnetic drivers are
input into these models. Understanding geomagnetic effects on composition
during geomagnetically quiet times has proved to be even more of a
challenge. The Global-scale Observations of the Limb and Disk (GOLD)
mission is allowing a new look at these composition changes, and ties them
to temperature as well. However, few geomagnetic storms have occurred since
GOLD started observing, so our early work has concentrated on the effects
of weaker geomagnetic activity on thermospheric composition. Surprisingly,
these effects have proven to be large. In this presentation, I will
describe why composition changes during geomagnetic storms and then apply
this understanding to the “quiet-time” changes seen by GOLD and to some of
the changes in TEC.

Lecture Date/Time:
Thursday, 5 November 2020
3:00 p.m. Eastern Standard Time (20:00 UTC)

  The Buonsanto Lecture's frontier science topic is directly relevant to
anyone interested in Earth's atmosphere, whether neutral or ionized.
Students, professors, and researchers from the international atmospheric
science community are encouraged to attend.

The lecture will be live streamed beginning at 3 pm EST (20 UTC).  Full
details are available now at the Buonsanto Lecture series page:

https://www.haystack.mit.edu/conference-2/buonsanto-lecture/

Note that the live streaming video information will be available on the
page before the lecture start.

Regards,
Phil
-----
Philip Erickson, Ph.D.
Atmospheric and Geospace Sciences Group
MIT Haystack Observatory
Westford, MA  01886  USA

email: pje at haystack.mit.edu
WWW: http://www.haystack.mit.edu
voice: +1 617 715 5769
fax:   +1 781 981 5766

Public key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x54878872
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