Tootfinder

foursquare_global: Foursquare global check-ins (2013)
A bipartite network of users and locations, representing check-in events worldwide on Foursquare, from April 2012 to September 2013. Metadata include country, city name, city type (e.g. national capital), and vender's latitude and longitude.
This network has 3935215 nodes and 22809624 edges.
Tags: Social, Online, Unweighted, Metadata, Timestamps

The impacts of tropospheric gravity wave-generated MSTIDs on skywaves at middle latitude North American sector observed and modeled using SuperDARN HF radars
S. Chakraborty, P. A. Inchin, S. Debchoudhury, C. Heale, B. Bergsson, M. Zettergren, J. M. Ruohoniemi
https://arxiv.org/abs/2506.23984…

The impacts of tropospheric gravity wave-generated MSTIDs on skywaves at middle latitude North American sector observed and modeled using SuperDARN HF radars
Trans-ionospheric high frequency (HF: 3-30 MHz) response to gravity waves (GWs) is studied in the middle-latitude ionosphere in relation to thunderstorm activity. SuperDARN HF radar observations are compared against the model simulations to quantify the impact of GW-generated MSTID (medium-scale traveling ionospheric disturbances) activity on the skywaves traveling through ionospheric F-region heights. The tropospheric thunderstorm-driven convective source is modeled using MAGIC. The outputs ar…

Meridional Movements of Individual Sunspots and Pores
Andrey Tlatov, Kseniya Tlatova
https://arxiv.org/abs/2506.22751 https://arxiv.o…

Meridional Movements of Individual Sunspots and Pores
The analysis of the meridional displacement velocity of individual solar pores and sunspots has been performed. In the period May 2010\,-\,March 2025 of observations in the continuum of the \textit{Solar Dynamics Observatory/Helioseismic and Magnetic Imager} (SDO/HMI), we identified more than $3.6\cdot 10^{5}$ sunspots and pores for analysis and tracked their displacement. The velocity of the meridional displacement of spots $v_{\rm m}$ depends on their magnetic polarity, latitude, and stage of…

Bayesian Inference for Spatially-Temporally Misaligned Data Using Predictive Stacking
Soumyakanti Pan, Sudipto Banerjee
https://arxiv.org/abs/2505.24397 ht…

Bayesian Inference for Spatially-Temporally Misaligned Data Using Predictive Stacking
Air pollution remains a major environmental risk factor that is often associated with adverse health outcomes. However, quantifying and evaluating its effects on human health is challenging due to the complex nature of exposure data. Recent technological advances have led to the collection of various indicators of air pollution at increasingly high spatial-temporal resolutions (e.g., daily averages of pollutant levels at spatial locations referenced by latitude-longitude). However, health outco…

Sodium and Potassium Linewidths as an Atmospheric Escape Diagnostic at Mercury
Patrick Lierle, Carl Schmidt
https://arxiv.org/abs/2505.23915 https://

Sodium and Potassium Linewidths as an Atmospheric Escape Diagnostic at Mercury
The spatial distribution and linewidth of Mercury's sodium and potassium exosphere were observed using a combination of long-slit and high-resolution point spectroscopy. Effective temperatures were estimated from emission line profiles by forward modeling their Doppler broadening. These serve as an energy metric for collisionless gas that is inherently nonthermal. The Na gas at low and mid-latitudes ranges from 1200-1300 K along the noon meridian, in agreement with MESSENGER scale heights, incr…

Preliminary analysis of the annual component of the polar motion over 180-year data interval
Natalia Miller, Zinovy Malkin
https://arxiv.org/abs/2507.00197

Preliminary analysis of the annual component of the polar motion over 180-year data interval
The paper presents preliminary results of studying variations in the annual component in the Earth's polar motion. For this purpose, a signal with an annual period was extracted, firstly, from the series of pole coordinates of the International Earth Rotation and Reference Systems Service (IERS), and secondly, from the combined series of Pulkovo latitude variations for 1840--2017. For this purpose, one-dimensional and multidimensional singular spectrum analysis was used. The Hilbert transform w…

internet_top_pop: Internet topology (PoP level) (1969-2012)
Assorted snapshots of internet graph at the Point of Presence (PoP) level (which lies between the IP and AS levels), collected from around the world and at various times. The earliest snapshots are for ARPANET (1969-1972), with a few more from pre-2000. Most are from 2006 onward. Metadata include link type or speed, longitudes, and latitudes of nodes, URL, and date of record.
This network has 19 nodes and 24 edges.

Loose threads: parsec-scale filamentation in the high Galactic latitude molecular clouds MBM 3 and MBM 16
Marco Monaci, Loris Magnani, Steven N. Shore
https://arxiv.org/abs/2506.19728

Loose threads: parsec-scale filamentation in the high Galactic latitude molecular clouds MBM 3 and MBM 16
The existence of high galactic latitude molecular clouds has been known for several decades, and studies of their dust and gas distributions reveal complicated morphological structures. Their dynamics involve turbulence even in the absence of internal energy sources such as stars. We study in detail two such clouds, MBM 3 and MBM 16, trying to recover the geometric structure and topology of the gas distribution. In particular, we address the evidence of superthermal asymmetric atomic and molecu…

Characterizing the Observational Properties of the Sun's High-latitude m=1 Inertial Mode
Boyang Ding, Junwei Zhao, Ruizhu Chen, Matthias Waidele, Sushant S. Mahajan, Oana Vesa
https://arxiv.org/abs/2506.19634

Characterizing the Observational Properties of the Sun's High-latitude m=1 Inertial Mode
Low-m inertial modes have been recently discovered in the Sun's high-latitude regions. In this study, we characterize the observational properties of the m = 1 mode by analyzing time-distance subsurface flow maps. Synoptic flow maps, constructed from daily subsurface flow maps using a tracking rate corresponding to the rotation at latitude 65 degrees, are filtered in both the spherical harmonic and Fourier domains to retain only the m = 1 mode and its dominant frequencies. Our analysis reveals …

foursquare_global: Foursquare global check-ins (2013)
A bipartite network of users and locations, representing check-in events worldwide on Foursquare, from April 2012 to September 2013. Metadata include country, city name, city type (e.g. national capital), and vender's latitude and longitude.
This network has 3935215 nodes and 22809624 edges.
Tags: Social, Online, Unweighted, Metadata, Timestamps