10 Result(s)

Article

Correction to: Michelson Interferometer for Global High-Resolution Thermospheric Imaging (MIGHTI) On-Orbit Wind Observations: Data Analysis and Instrument Performance

Christoph R. Englert, John M. Harlander, Kenneth D. Marr… in Space Science Reviews (2023)

Article

Spatial variability of trace gases (NO₂, O₃ and CO) over Indian region during 2020 and 2021 COVID-19 lockdowns

COVID-19 lockdown has given us an opportunity to investigate the pollutant concentrations in response to the restricted anthropogenic activities. The atmospheric concentration levels of nitrogen dioxide (NO₂), ca...

Vasudevan Geetha Vignesh, Chaithanya D. Jain… in Environmental Monitoring and Assessment (2023)

Article

Michelson Interferometer for Global High-Resolution Thermospheric Imaging (MIGHTI) On-Orbit Wind Observations: Data Analysis and Instrument Performance

The design, principles of operation, calibration, and data analysis approaches of the Michelson Interferometer for Global High-resolution Thermospheric Imaging (MIGHTI) on the NASA Ionospheric Connection (ICON...

Christoph R. Englert, John M. Harlander, Kenneth D. Marr… in Space Science Reviews (2023)

Article

Anthropogenic influence on the changing risk of heat waves over India

The overarching goal of this paper is to shed light on the human influence on the changing patterns of heat waves in India using the Heat Wave Magnitude Index daily (HWMId). The HWMId obtained from the observa...

P. Kishore, Ghouse Basha, M. Venkat Ratnam, Amir AghaKouchak… in Scientific Reports (2022)

Article

Changing patterns in aerosol vertical distribution over South and East Asia

Changing patterns in aerosol concentrations over the Asian region is well documented with a concurrent increase over India and a marked reduction over China. However, aerosol vertical distribution in the chang...

M. Venkat Ratnam, P. Prasad, S. T. Akhil Raj, M. Roja Raman… in Scientific Reports (2021)

Article

Do minor sudden stratospheric warmings in the Southern Hemisphere (SH) impact coupling between stratosphere and mesosphere–lower thermosphere (MLT) like major warmings?

We have investigated the coupling between the stratosphere and mesosphere–lower thermosphere (MLT) in the Southern Hemisphere (SH) during 2010 minor sudden stratospheric warmings (SSWs). Three episodic SSWs we...

S. Eswaraiah, Yong Ha Kim, Huixin Liu, M. Venkat Ratnam… in Earth, Planets and Space (2017)

Article

Historical and Projected Surface Temperature over India during the 20^th and 21^st century

Surface Temperature (ST) over India has increased by ~0.055 K/decade during 1860–2005 and follows the global warming trend. Here, the natural and external forcings (e.g., natural and anthropogenic) responsible...

Ghouse Basha, P. Kishore, M. Venkat Ratnam, A. Jayaraman… in Scientific Reports (2017)

Article

Morphology of tropical mesospheric echoes observed by VHF radar

This short communication reports on an attempt which has been made to study mesospheric echo occurrence duration for the first time, using a large data base (1998 to 2004) collected from MST radar located at G...

M. Venkat Ratnam, G. Kishore Kumar, S. Eswaraiah… in Earth, Planets and Space (2013)

Article

Characteristics of gravity waves observed with intensive radiosonde campaign during November–December 2005 over western Sumatera

Characteristics of gravity waves are studied using radiosonde campaign conducted during November–December 2005 at Koto Tabang (KT, 0.2°S, 100.32°E). Intensive sounding with hourly launches was also conducted o...

M. Venkat Ratnam, Simon P. Alexander, T. Kozu, T. Tsuda in Earth, Planets and Space (2009)

Article

Temporal and spatial distributions of atmospheric wave energy in the equatorial stratosphere revealed by GPS radio occultation temperature data obtained with the CHAMP satellite during 2001–2006

Using stratospheric temperature profiles derived from GPS radio occultation (RO) measurements made by the German CHAMP satellite from June 2001 to May 2006, we studied the climatological behavior of atmospheri...

Toshitaka Tsuda, M. Venkat Ratnam, Simon P. Alexander… in Earth, Planets and Space (2009)