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Browsing by Author "Ebihara, Yusuke"

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Extreme space weather event in 1903 October/November: an outburst from the quiet sun

Hayakawa, Hisashi; Ribeiro, Paulo; Vaquero, José M.; Gallego, María Cruz; Knipp, Delores J.; Mekhaldi, Florian; Bhaskar, Ankush; Oliveira, Denny M.; Notsu, Yuta; Carrasco, Víctor M. S.; Caccavari, Ana; Veenadhari, Bhaskara; Mukherjee, Shyamoli; Ebihara, Yusuke (2020)

While the Sun is generally more eruptive during its maximum and declining phases, observational evidence shows certain cases of powerful solar eruptions during the quiet phase of solar activity. Occurring in the weak Solar ...
Instantaneous achievement of the hall and pedersen–cowling current circuits in northern and southern hemispheres during the geomagnetic sudden commencement on 12 May 2021

Kikuchi, Takashi; Araki, Tohru; Hashimoto, Kumiko K.; Ebihara, Yusuke; Tanaka, Takashi; Nishimura, Yukitoshi; Vichare, Geeta; Sinha, Ashwini K.; Chum, Jaroslav; Hosokawa, Keisuke; Tomizawa, Ichiro; Tanaka, Yoshimasa; Kadokura, Akira (2022)

The present article aims at a consistent understanding of observation, theoretical model, and simulation with the geomagnetic sudden commencement (SC) observed in the morning and afternoon at high and middle latitudes in ...
L-Value and Energy Dependence of 0.1–50 keV O +, He +, and H + Ions for CME and CIR Storms Over the Entire Van Allen Probes Era

Pandya, Megha; Veenadhari, B.; Ebihara, Yusuke; Reeves, G. D. (2022)

Our studies report the first observation of L-value and energy sorted correlation of differential fluxes of 0.1–50 keV O +, He +, and H + ions with different geophysical parameters for 29 Coronal Mass Ejected (CME) and ...
Low-latitude Aurorae during the Extreme Space Weather Events in 1859

Hayakawa, Hisashi; Ebihara, Yusuke; Hand, David P.; Hayakawa, Satoshi; Kumar, Sandeep (2018)

The Carrington storm (1859 September 1/2) is one of the largest magnetic storms ever observed, and it caused global auroral displays in low-latitude areas, together with a series of multiple magnetic storms from 1859 ...
Magnetic conjugacy of Pc1 waves and isolated proton precipitation at subauroral latitudes: importance of ionosphere as intensity modulation region

Ozaki, Mitsunori; Shiokawa, Kazuo; Horne, Richard B.; Engebretson, Mark J.; Lessard, Marc; Ogawa, Yasunobu; Hosokawa, Keisuke; Nosé, Masahito; Ebihara, Yusuke; Kadokura, Akira; Yagitani, Satoshi; Miyoshi, Yoshizumi; Hashimoto, Shion; Sinha, Shipra; Sinha, Ashwini K.; Seemala, Gopi K.; Jun, Chae-Woo (2021)

Pc1 geomagnetic pulsations, equivalent to electromagnetic ion cyclotron waves in the magnetosphere, display a specific amplitude modulation, though the region of the modulation remains an open issue. To classify whether ...
Plasma wave occurrences during substorm events

Shah, Trunali; Bhaskara, Veenadhari; Omura, Yoshiharu; Ojha, Biswajit; Singh, Satyavir; Ebihara, Yusuke (2024)

The Earth's magnetosphere is a dynamic system subject to various disturbances, among which substorms play a significant role in influencing its impact on the surrounding plasma environment. Close to the substorm onset ...
Signatures of substorm related overshielding electric field at equatorial latitudes under steady southward IMF Bz during main phase of magnetic storm

Veenadhari, Bhaskara; Kikuchi, Takashi; Kumar, Sandeep; Tulasiram, S.; Chakrabarty, D.; Ebihara, Yusuke; Reeves, G.D. (2019)

During the geomagnetic storm periods, the convection electric field penetrates promptly to equatorial latitudes, causing an eastward electric field in the dayside ionosphere. Occasionally, the polarity of the dayside ...
Variation of Radiation Belt Electron Flux During CME‐ and CIR‐Driven Geomagnetic Storms: Van Allen Probes Observations

Pandya, Pandya; Bhaskara, Veenadhari; Ebihara, Yusuke; Kanekal, Shrikanth G.; Baker, Daniel N. (2019)

Relativistic electron flux responses in the inner magnetosphere are investigated for 28 magnetic storms driven by corotating interaction region (CIR) and 27 magnetic storms driven by coronal mass ejection (CME), using ...

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