6 papers · 1 filter
A composite of the effects of major sudden stratospheric warming events on carbon dioxide radiative cooling in the mesosphere-lower-thermosphere
Akash Kumar, MV Sunil Krishna, Alok K Ranjan
The major sudden stratospheric warming (SSW) events strongly influence the mean structure of the entire atmosphere, from the troposphere to the thermosphere. These events disrupt t…
Predictive modeling of altitude resolved greenline airglow emission (557.7 nm) in the MLT region
Dayakrishna Nailwal, MV Sunil Krishna, Alok Kumar Ranjan +1
Atomic oxygen is a critical and highly reactive chemical species responsible for key physical and chemical processes in the mesosphere and lower thermosphere.
Evidence of potential thermospheric overcooling during the May 2024 geomagnetic superstorm
Alok Kumar Ranjan, Dayakrishna Nailwal, MV Sunil Krishna +2
During intense geomagnetic storms, the rapid and significant production of NO followed by its associated infrared radiative emission in lower thermosphere contributes crucially to…
Effect of 2009 major SSW event on the mesospheric CO2 cooling
Akash Kumar, MV Sunil Krishna, Alok K Ranjan
Carbon dioxide (CO2), an important trace species that is gradually increasing in the atmosphere due to anthropogenic activities, causes enhanced warming in the lower atmosphere. Th…
Seasonal variation in nighttime NO radiative cooling as observed by TIMED/SABER in lower thermosphere during solar maximum and solar minimum
Alok Kumar Ranjan, MV Sunil Krishna, Akash Kumar +2
Both composition and temperature play a crucial role in determining the NO radiative cooling in lower thermosphere as observed by TIMED/SABER. In this work, we present a detailed i…
Modeling of Nitric Oxide Infrared radiative flux in lower thermosphere: a machine learning perspective
Dayakrishna Nailwal, MV Sunil Krishna, Alok Kumar Ranjan +1
Nitric Oxide (NO) significantly impacts energy distribution and chemical processes in the mesosphere and lower thermosphere (MLT). During geomagnetic storms, a substantial influx o…