Science Seminars

4/21/2016 – Sonal Jain; Mars’ atmosphere and its variability as observed by Imaging Ultraviolet Imaging Spectrograph onboard MAVEN.

Speaker: Sonal Jain (LASP)
Date: Tuesday, Apr 21, 2020
Time: 4:00 PM
Location: SPSC W120

Seminar Abstract:

The Imaging Ultraviolet Spectrograph (IUVS) is one of nine science instruments aboard the Mars Atmosphere and Volatile and EvolutioN (MAVEN) spacecraft, whose payload is dedicated to exploring the upper atmosphere of Mars and understanding the magnitude and drivers of Mars’ atmospheric escape rate. IUVS uses ultraviolet light to investigate the lower and upper atmosphere and ionosphere of Mars. The instrument is among the most powerful spectrographs sent to another planet, with several key capabilities: (1) separate Far-UV & Mid-UV channels for stray light control, (2) a high resolution echelle mode to resolve deuterium and hydrogen emission, (3) internal instrument pointing and scanning capabilities to allow complete mapping and nearly continuous operation, and (4) optimization for airglow studies. IUVS, along with other MAVEN instruments, obtains a comprehensive picture of the current state of the Mars upper atmosphere and ionosphere and the processes that control atmospheric escape. With its different observing modes IUVS provide information about the various regions of Martian atmosphere. I present an overview of IUVS results, including (1) Significant seasonal and short-timescale variability in thermospheric airglow emissions; (2) Coupling between lower and upper atmosphere (3) Global ozone maps spanning six months of seasonal evolution; and (4) H and O coronal observations.