3 papers
physics.space-ph2026
First Observation of Multiple Very-Near-Earth Reconnection Events During a Single Storm Main Phase
Fekireselassie Beyene, Vassilis Angelopoulos, Christine Gabrielse +11
For the first time, this paper presents three very-near-Earth reconnection (VNERX) events observed within the same 12-hour-long storm main phase. The THEMIS inner probes observed t…
astro-ph.SR2024
The Extreme Space Weather Event of 1872 February: Sunspots, Magnetic Disturbance, and Auroral Displays
Hisashi Hayakawa, Edward W. Cliver, Frédéric Clette +19
We review observations of solar activity, geomagnetic variation, and auroral visibility for the extreme geomagnetic storm on 1872 February 4. The extreme storm (referred to here as…
physics.geo-ph2024
X-Raying Neutral Density Disturbances in the Mesosphere and Lower Thermosphere induced by the 2022 Hunga-Tonga Volcano Eruption-Explosion
Satoru Katsuda, Hiroyuki Shinagawa, Hitoshi Fujiwara +14
We present X-ray observations of the upper atmospheric density disturbance caused by the explosive eruption of the Hunga Tonga-Hunga Ha'apai (HTHH) volcano on 15 January 2022. From…