Sumanta Sarkhel

Sumanta Sarkhel
Indian Institute of Technology Roorkee | University of Roorkee · Department of Physics

Ph.D.

About

38
Publications
3,316
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
177
Citations
Introduction
I did my Ph.D. from Physical Research Laboratory, Ahmedabad, India in 2011. Afterwards, I worked at The Pennsylvania State University, Pennsylvania, USA, Arecibo Observatory, Puerto Rico, USA and Korea Polar Research Institute, South Korea as post-doctoral fellows. I am now Associate Professor at the Department of Physics, Indian Institute of Technology Roorkee, India. My area of research is Atmospheric and Space Physics. Visit my group webpage for collaboration: https://allsky.iitr.ac.in/
Additional affiliations
March 2021 - present
Indian Institute of Technology Roorkee
Position
  • Professor (Associate)
August 2014 - March 2021
Indian Institute of Technology Roorkee
Position
  • Professor (Assistant)
April 2014 - June 2014
Korea Polar Research Institute
Position
  • PostDoc Position

Publications

Publications (38)
Preprint
Full-text available
The measurements from the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft, orbiting Mars are used for investigating the impact of coronal mass ejection (CMEs) and corotating interaction region (CIRs) on the ionospheric species variations in the Martian ionosphere. We have chosen 15 CME and 15 CIR events from the existing catalogs in order...
Article
Full-text available
Nitric Oxide is a very important trace species which plays a significant role acting as a natural thermostat in Earth’s thermosphere during strong geomagnetic activity. In this paper, we present various aspects related to the variation in the NO Infrared radiative flux (IRF) exiting the thermosphere by utilizing the TIMED/SABER (Thermosphere Ionosp...
Article
Full-text available
This paper reports a rare interaction between two fronts of nighttime medium scale traveling ionospheric disturbances (MSTIDs) and associated phenomena observed over geomagnetic low-mid latitude transition region on a geomagnetically quiet night (Ap=5) of 21 May, 2020. The event was observed for nearly eight hours in O(1D) 630.0 nm airglow images c...
Article
Full-text available
An intriguing and rare gravity wave event was recorded on the night of 25 April 2017 using a multiwavelength all-sky airglow imager over northern Germany. The airglow imaging observations at multiple altitudes in the mesosphere and lower thermosphere region reveal that a prominent upward-propagating wave structure appeared in O(1S) and O2 airglow i...
Article
A prominent signature of dark bore front in the mesospheric O(¹S) airglow emission is observed on a night in the late winter at Hanle (32.7oN, 78.9oE) located in the western Himalaya. The leading front was followed by a series of evident trailing waves and the event lasts for more than two hours. The characteristic features of the bore indicate it...
Article
Full-text available
On a geomagnetic quiet night of 29 October 2018, we captured an observational evidence of the onset of dark band structures within the field-of-view of an all-sky airglow imager operating at 630.0 nm over a geomagnetic low-mid latitude transition region, Hanle, Leh Ladakh. Simultaneous ionosonde observations over New Delhi shows the occurrence of s...
Preprint
Full-text available
An intriguing and rare gravity wave event was recorded on the night of 25 April 2017 using a multiwavelength all-sky airglow imager over northern Germany. The airglow imaging observations at multiple altitudes in the mesosphere and lower thermosphere region reveal that a prominent upward-propagating wave structure appeared in O(1S) and O2 airglow i...
Article
In this paper, we study the interaction between a nighttime Medium Scale Traveling Ionospheric Disturbance (MSTID) and geomagnetic north-south oriented field-aligned plasma depletion structure over Hanle, Leh Ladakh (32.7°N, 78.9°E; Mlat. ∼24.1°N), India on a geomagnetically quiet night (06 May 2019, Ap = 4). The results are based on the observatio...
Article
An undular mesospheric bore event has been recorded over the western Himalayan region in O(¹S) 557.7 nm airglow images on a clear and moonless night of 02 October 2018 using a multi-wavelength all-sky imager at Hanle, Leh Ladakh, India (32.77°N, 79.97°E). The bore has a prominent leading dark front followed by trailing waves and it propagates with...
Article
We report a unique simultaneous occurrence of two plasma structures using a 630.0 nm all-sky airglow imager in Hanle, India. The characteristics indicate that the observed structures are Medium Scale Travelling Ionospheric Disturbances (MSTIDs) of different types, namely periodic and single dark band. Based on previous understandings of Perkins ins...
Article
Full-text available
On a geomagnetically quiet night of 07 July 2018, the allsky imager at Hanle, Leh Ladakh (32.7°N, 78.9°E; Mlat. ∼24.1°N), India captured a number of plasma structures in O(1D) 630.0 nm airglow emission. In a short observational period of around 3 hours, two different Medium Scale Traveling Ionospheric Disturbances (MSTIDs) and two different mid‐lat...
Article
An uninterrupted multi-day (6–8 May 2013) ionospheric F-region event with features indicative of medium-scale traveling ionospheric disturbances (MSTIDs) was detected with the Millstone Hill (MH) incoherent scatter radar (ISR). It was later identified, with the addition of Global Positioning System total electron content (GPS-TEC) imaging, as a nov...
Article
Full-text available
An observational evidence of a unique plasma depletion event was captured by an O(1D) 630.0 nm airglow imager on 13 June 2018 over a transition region of geomagnetic low‐mid latitude, Hanle, Leh Ladakh, India (32.77°N, 78.97°E; Mlat. ~24.1°N). The observed plasma depletion structures are tilted at an angle of 13°±2° west of the geomagnetic north an...
Article
Full-text available
Spatio‐temporal characteristics of equatorial plasma bubble (EPB) have been studied based on Equatorial Atmosphere Radar (EAR) fan sector observations from Kototabang. EPBs were characterized as either locally generated (whose genesis and subsequent evolution was observed in the fan sector maps) or drifted type (which drifted into fan sector scans...
Article
Full-text available
We have installed a multi-wavelength allsky airglow imager over the Indian Himalayan region at Hanle, Leh Ladakh, (32.7°N, 78.9°E; dip lat. ∼24.1°N). This is the first of its kind that is installed in the Himalayan region at an altitude of around 4200 m above the mean sea level. The high sensitive thermoelectrically cooled CCD based imager is equip...
Article
Full-text available
In order to understand the characteristics of long‐lasting “C‐type” structure in the Sodium (Na) lidargram, six cases from different observational locations have been analyzed. The Na lidargram, collected from low, mid and high latitude sites, show long lifetime of the “C‐type” structures which is believed to be the manifestation of Kelvin‐Helmholt...
Article
This review article briefly brings out the historical development of atmospheric sodium (Na) measurements over India and the importance of coordinated measurements with multiple techniques to address physical processes in the Earth's upper atmosphere. These measurements were initiated in the early 1970s by observing Na airglow emission intensities...
Article
On 13 April 2013, the ACE spacecraft detected arrival of an interplanetary shock at 2250 UT, which is followed by the passage of the sheath region of an interplanetary coronal mass ejection (ICME) for a prolonged (18-hr) period. The polarity of interplanetary magnetic field Bz was northward inside the magnetic cloud region of the ICME. The ring cur...
Article
Full-text available
We present case studies of the mesospheric alkali and non-alkali metals, Na and Fe, along with electron concentrations [Ne] obtained from measurements made at Arecibo on nights of 17-18 and 18-19 March 2004. The background mesospheric conditions as recorded by an airglow all-sky imager displayed ripple- and band-type structures on these nights. Bot...
Article
Full-text available
The height-time-concentration map of neutral sodium (Na) atoms measured by a Na lidar during the night of 18 to 19 March 2007 over Gadanki, India (13.5? N, 79.2? E) reveals an unusual structure in the Na layer for around 30 min in the altitude range of 92 to 98 km which is similar to the usual `C? type structures observed at other locations. In ord...
Article
Full-text available
Characteristics of the intraseasonal oscillations (ISO) in the mesosphere and lower thermosphere (MLT) are investigated using meteor radar wind observations from a South American, equatorial station, Sao Joao do Cariri (7.4 degrees S, 36.5 degrees W) during 2008. A prominent ISO signature is observed during January-May in the period band approximat...
Article
The effects of a major stratospheric sudden warming (SSW) at extratropical latitudes have been investigated with wind and temperature observations over a Brazilian station, Cachoeira Paulista (22.7°S, 45°W) during September–October 2002. In response to the warming at polar latitudes a corresponding cooling at tropical and extratropical latitudes is...
Article
The effects of a major stratospheric sudden warming (SSW) at extratropical latitudes have been investigated with wind and temperature observations over a Brazilian station, Cachoeira Paulista (22.7°S, 45°W) during September–October 2002. In response to the warming at polar latitudes a corresponding cooling at tropical and extratropical latitudes is...
Article
Full-text available
We present a rare event that was recorded over Arecibo using sodium (Na) lidar. Billow-like structures with periods of ~60 min were seen in the Na layer above 102 km on the night of 7–8 July 2010. The absence of any high-altitude structure was noted on the following night. Spectral analysis using the Lomb-Scargle technique reveals periods with larg...
Conference Paper
Systematic measurements of the tropical intra-seasonal oscillation (ISO) have been carried out with radiosonde and TIMED Doppler Interferometer zonal wind data along with Outgoing Longwave Radiation (OLR) data over Gadanki (13.5N, 79.2E). There is an emphatic signature of ISO modulation by dominant annual oscillation in the lower atmosphere. Period...
Article
Full-text available
Simultaneous observations of a narrowband sodium (Na) airglow photometer corresponding to the D2 line in conjunction with a Na lidar from Gadanki (13.5°N, 79.2°E), India, reveal episodic enhancements in Na airglow intensity during 1930–0142 Indian standard time (IST; IST = UT + 5.5 h) on 18–19 March 2007. This variation is drastically different fro...
Article
In order to identify the dominant modes of mesospheric gravity waves, sodium (Na) airglow mea-surements were carried out in campaign modes during November, 2006 -February, 2009 over Mt. Abu (24.6o N, 72.7o E) and Gadanki (13.5o N, 79.2o E) using a narrow-band and narrow field-of-view Na airglow photometer. The airglow observations yield the tempora...
Article
Full-text available
In order to understand the substantial variation of sodium (Na) airglow intensity from one night to another, a case study is performed using simultaneous, campaign-based measurements of Na airglow and Na lidar during March 2007 from Gadanki (13.5°N, 79.2°E), India, during postmidnight hours. The altitude profiles of mesospheric ozone, temperature,...
Article
In order to investigate the relation between the sodium airglow emission and sodium atoms, a narrow-band and narrow field-of-view sodium airglow photometer was operated in campaign modes from Gadanki (13.5° N, 79.2° E) in conjunction with sodium lidar during March, 2007 and 2008. The airglow observations yielded the temporal variation of altitude-i...
Article
Full-text available
Plasma irregularity structures associated with an Equatorial Spread-F (ESF) event were recorded by the Indian VHF Radar on 26?27 April 2006 near midnight hours. The plasma structures were found to be isolated without having bottomside structure. They moved predominantly downward and the structures were found to be less turbulent than their post-sun...

Network

Cited By

Projects

Project (1)
Project
We investigate the source(s) of particularly the longer period MSTIDs. Recent work demonstrates that global-scale waves—revealed in GPS delta-TEC results—are launched by auroral zone Joule heating events as revealed in AMPERE results. A summary is given in "Multi-Instrument Observations of MSTIDs and Source Determinations" by Dinsmore et al. (downloadable from here).